vision, sensation & perception
TRANSCRIPT
Vision sensation
perception
Dr Irene Karayianni
What basic processes underlie the sense of vision
How do we see colors
It all starts with light
focusing the light more sharply
Opening depends on the amount of light into the environment
Bends the rays of light so that they are properly focused on the rear of the eye
electromagnetic energy of light is converted to electrical impulses
Letrsquos zoom in
to check out the retina
Shape
Function
Distribution
Dark adaptation
httpswwwyoutubecomwatchv=Lcv8g-0VdMI httpswwwyoutubecomwatchv=gvozcv8pS3c
Processing the visual image
Feature detection
Separate neural systems exist for processing information about specific aspects of the visual world
Integration
httpswwwyoutubecomwatchv=evQsOFQju08
Is Your Red The Same as My Red
red-green color blindness blue-yellow color blindness
7 04
trichromatic theory of color vision
blue-violet green yellow-red
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
What basic processes underlie the sense of vision
How do we see colors
It all starts with light
focusing the light more sharply
Opening depends on the amount of light into the environment
Bends the rays of light so that they are properly focused on the rear of the eye
electromagnetic energy of light is converted to electrical impulses
Letrsquos zoom in
to check out the retina
Shape
Function
Distribution
Dark adaptation
httpswwwyoutubecomwatchv=Lcv8g-0VdMI httpswwwyoutubecomwatchv=gvozcv8pS3c
Processing the visual image
Feature detection
Separate neural systems exist for processing information about specific aspects of the visual world
Integration
httpswwwyoutubecomwatchv=evQsOFQju08
Is Your Red The Same as My Red
red-green color blindness blue-yellow color blindness
7 04
trichromatic theory of color vision
blue-violet green yellow-red
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
It all starts with light
focusing the light more sharply
Opening depends on the amount of light into the environment
Bends the rays of light so that they are properly focused on the rear of the eye
electromagnetic energy of light is converted to electrical impulses
Letrsquos zoom in
to check out the retina
Shape
Function
Distribution
Dark adaptation
httpswwwyoutubecomwatchv=Lcv8g-0VdMI httpswwwyoutubecomwatchv=gvozcv8pS3c
Processing the visual image
Feature detection
Separate neural systems exist for processing information about specific aspects of the visual world
Integration
httpswwwyoutubecomwatchv=evQsOFQju08
Is Your Red The Same as My Red
red-green color blindness blue-yellow color blindness
7 04
trichromatic theory of color vision
blue-violet green yellow-red
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
focusing the light more sharply
Opening depends on the amount of light into the environment
Bends the rays of light so that they are properly focused on the rear of the eye
electromagnetic energy of light is converted to electrical impulses
Letrsquos zoom in
to check out the retina
Shape
Function
Distribution
Dark adaptation
httpswwwyoutubecomwatchv=Lcv8g-0VdMI httpswwwyoutubecomwatchv=gvozcv8pS3c
Processing the visual image
Feature detection
Separate neural systems exist for processing information about specific aspects of the visual world
Integration
httpswwwyoutubecomwatchv=evQsOFQju08
Is Your Red The Same as My Red
red-green color blindness blue-yellow color blindness
7 04
trichromatic theory of color vision
blue-violet green yellow-red
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Opening depends on the amount of light into the environment
Bends the rays of light so that they are properly focused on the rear of the eye
electromagnetic energy of light is converted to electrical impulses
Letrsquos zoom in
to check out the retina
Shape
Function
Distribution
Dark adaptation
httpswwwyoutubecomwatchv=Lcv8g-0VdMI httpswwwyoutubecomwatchv=gvozcv8pS3c
Processing the visual image
Feature detection
Separate neural systems exist for processing information about specific aspects of the visual world
Integration
httpswwwyoutubecomwatchv=evQsOFQju08
Is Your Red The Same as My Red
red-green color blindness blue-yellow color blindness
7 04
trichromatic theory of color vision
blue-violet green yellow-red
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Bends the rays of light so that they are properly focused on the rear of the eye
electromagnetic energy of light is converted to electrical impulses
Letrsquos zoom in
to check out the retina
Shape
Function
Distribution
Dark adaptation
httpswwwyoutubecomwatchv=Lcv8g-0VdMI httpswwwyoutubecomwatchv=gvozcv8pS3c
Processing the visual image
Feature detection
Separate neural systems exist for processing information about specific aspects of the visual world
Integration
httpswwwyoutubecomwatchv=evQsOFQju08
Is Your Red The Same as My Red
red-green color blindness blue-yellow color blindness
7 04
trichromatic theory of color vision
blue-violet green yellow-red
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
electromagnetic energy of light is converted to electrical impulses
Letrsquos zoom in
to check out the retina
Shape
Function
Distribution
Dark adaptation
httpswwwyoutubecomwatchv=Lcv8g-0VdMI httpswwwyoutubecomwatchv=gvozcv8pS3c
Processing the visual image
Feature detection
Separate neural systems exist for processing information about specific aspects of the visual world
Integration
httpswwwyoutubecomwatchv=evQsOFQju08
Is Your Red The Same as My Red
red-green color blindness blue-yellow color blindness
7 04
trichromatic theory of color vision
blue-violet green yellow-red
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Letrsquos zoom in
to check out the retina
Shape
Function
Distribution
Dark adaptation
httpswwwyoutubecomwatchv=Lcv8g-0VdMI httpswwwyoutubecomwatchv=gvozcv8pS3c
Processing the visual image
Feature detection
Separate neural systems exist for processing information about specific aspects of the visual world
Integration
httpswwwyoutubecomwatchv=evQsOFQju08
Is Your Red The Same as My Red
red-green color blindness blue-yellow color blindness
7 04
trichromatic theory of color vision
blue-violet green yellow-red
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Shape
Function
Distribution
Dark adaptation
httpswwwyoutubecomwatchv=Lcv8g-0VdMI httpswwwyoutubecomwatchv=gvozcv8pS3c
Processing the visual image
Feature detection
Separate neural systems exist for processing information about specific aspects of the visual world
Integration
httpswwwyoutubecomwatchv=evQsOFQju08
Is Your Red The Same as My Red
red-green color blindness blue-yellow color blindness
7 04
trichromatic theory of color vision
blue-violet green yellow-red
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Processing the visual image
Feature detection
Separate neural systems exist for processing information about specific aspects of the visual world
Integration
httpswwwyoutubecomwatchv=evQsOFQju08
Is Your Red The Same as My Red
red-green color blindness blue-yellow color blindness
7 04
trichromatic theory of color vision
blue-violet green yellow-red
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
httpswwwyoutubecomwatchv=evQsOFQju08
Is Your Red The Same as My Red
red-green color blindness blue-yellow color blindness
7 04
trichromatic theory of color vision
blue-violet green yellow-red
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
red-green color blindness blue-yellow color blindness
7 04
trichromatic theory of color vision
blue-violet green yellow-red
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
trichromatic theory of color vision
blue-violet green yellow-red
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
BUThellip
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
opponent-process theory of color vision
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Perceptual Organization
Constructing Our View of the World
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
The Gestalt Laws of Organization
Closure
Proximity
Similarity
Simplicity
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Closure
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Proximity
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Similarity
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Simplicity
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
The whole is more than the sum of its parts
Prosopagnosia
httpswwwyoutubecomwatchv=XLGXAiSpN00
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Top-Down and Bottom-up Processing
Ca- yo- re-d t-is -en-en-e w-ic- ha- ev-ry -hi-d l-tt-r m-ss-ng
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Depth perception
Translating 2-D to 3-D
binocular disparity
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
1 2 3 4 5 6 7 8 9 10
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Monocular cue - motion parallax
Depth perception
Translating 2-D to 3-D
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Monocular cue ndash relative size
Depth perception
Translating 2-D to 3-D
smaller image on the retina is farther away
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Depth perception
Translating 2-D to 3-D
Monocular cue ndash texture gradient
he details of things that are far away are less distinct
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Monocular cue ndash linear perspective
Depth perception
Translating 2-D to 3-D
distant objects appear to be closer together
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
For next time
Take photos to demonstrate any of the perception principles we discussed
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Perceptual Constancy
objects are perceived as unvarying and consistent
despite changes in their appearance (size)
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Motion Perception
Apparent moving perception that a stationary object is moving -
different areas of the retina are quickly stimulated leading us to
interpret motion
movement of an object across the retina (vs stable background)
image on the retina expands in size
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
all these rotating white dots are actually moving in straight lines
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
ldquoOur senses can be trusted but they can be easily fooledrdquo
Aristotle
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
httpswwwyoutubecomwatchv=OAVXHzAWS60
motion aftereffect
Certain neurons fire and are worn out they adapt to the motion
When you then shift your gaze to a stationary scene other competing
neurons over-compensate causing the illusion of movement in the other
direction
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Which of the two red lines is shorter
Muumlller-Lyer illusion
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Muumlller-Lyer illusion
One explanation
eye movements are greater when the arrow tips point inward making us perceive the
line as longer than it is when the arrow tips face outward
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Muumlller-Lyer illusion
Another explanation
we unconsciously attribute particular significance to each of the lines
relatively more distant inside
corner
relatively more close outside
corner
These lines provide cues
for depth
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Chubb illusion
apparent contrast of an object varies depending on context
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Ebbinghaus illusion
apparent size of an object varies depending on context
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
apparent color of an object varies depending on context
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Ponzo illusion
context is also fundamental for depth perception
We see the line as longer when we see cues that suggest it is further away
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Ames room
many cues of depth perception have been
changed to give the illusion of equal depth
httpswwwyoutubecomwatchv=Ttd0YjXF0no
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
concentric circles
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Hermann grid illusion
ldquoghostlikerdquo grey blobs perceived at the intersections of a
white grid on a black background
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Hering illusion
the lined pattern on the background that simulates a
perspective design and creates a false impression of depth
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Jastrow illusion
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Necker cube
the brain can ldquofliprdquo between 2 different views as it
attempts to translate a 2D drawing into a 3D cube
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
insideoutside illusion
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
When looking directly at a ring our brains notice the motion of the spots anticlockwise
When looking at a ring in the peripheral vision our brains notice motion of stripes clockwise
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
an impossible object
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
httpswwwyoutubecomwatchv=XglX4LCzE8I
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Subliminal perception
(priming)
bull Perception of messages about which we have no
awareness
bull Stimulus is not intense enough for you to report having
experienced it
bull Can influence behavior in subtle ways
bull Little evidence that it can lead to major changes in
attitudes or behavior
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
httpswwwyoutubecomwatchv=OW9ou1kB1cU
Extrasensory perception
Extrasensory perception