9.00 introduction to psychology talia konkle 1 mar 07 what do you see? … when you see it, keep it...
TRANSCRIPT
9.00 Introduction to Psychology
Talia Konkle1 Mar 07
What do you see?
… When you see it, KEEP IT TO YOURSELF!
Pop Quiz
Review: Vision
Discussion:DEMOS!
Timekeeper?
Logistics:Turn in PapersPeer Editing Guidelines
The Plan for today :
:15
:35
:50
Visual Themes
- our sense of the world is “constructed” from the input
- processing of the world is highly dependent on our visual experience
W. W. Norton
World
Retina
LGN
V1
“What” “Where”
Basic Visual Pathway
Retina
light
rods and cones
bipolar cells
ganglion cells
(optic nerve) parvo
magnoblindspot
W. W. Norton
World
Retina
LGN
V1
“What” “Where”
Basic Visual Pathway
W. W. Norton
World
Retina
LGN
V1
“What” “Where”
Basic Visual Pathway
Where
What
V1
“What vs Where”
Receptive Field
visual field neuron in V1
Retinotopy
Associative Apperceptive
AGNOSIAS
other questions about the lectures?
That’s good and all…
Now show me what it all does!
Color opponency, receptor adaptation
Color opponency, receptor adaptation
The visual system adjusts itself.
• In time.• In space.
• Why does it adjust?– sensitivity and gain?– neural fatigue?– adjustment of priors? (effects in the opposite
direction) – Error correction?
Simultaneous [blur] contrast(adjustment in space)
Face adaptation(adjustment in time)
split class in half for demo…
Face adaptation(adjustment in time)
Face adaptation(adjustment in time)
Sensitivity to ChangesAutomatic Role of context
Cornsweet illusion: changes in luminance
Sensitivity to context
Kaniza triangle
phi
phi
bistable phi
bistable phi
Expectations and beliefs influence visual processing
A stimulus in context
A B C2
4
Only reasonable 3D interpretations come to mind….
Bio motion(Gestalt, or expectations?)
• http://www.biomotionlab.ca/Demos/BMLwalker.html
Change blindness
What does this say about our perception and memory of the
world?
Get Ready…
I’m going to show you a picture
and I want you to remember it!
(you’ll have 3 seconds)
+
Which One Did You See?
A B
C D
Which One Did You See?
A B C D
too close too far
correct answer
Boundary EffectBackground
Intraub and Richardson (1989)Intraub and Bodamer (1993)Intraub (2002)Bertamini (2005)
tenuous perception and representation of our world?
Attention
Visual Search
Search for the red vertical
Pretty easy.
Search for the red vertical
again
Harder?
Guiding attention by color… pretty easy
Guiding attention by color AND orientation, more difficult
one more time, find the red vertical
How do we explain this?feature maps
Multiple object tracking
• Spotlight metaphor of attention.
• Can you split it?
demos
Is the minds eye different than the real eye?
A little on mental imagery
Hemispatial neglect extends to mental imagery
Bisiach and Luzzati (1978)
Insights from the Clinical Neuropsychology
Removal of Primary Visual Cortex leads to…
(Farah 2000)
Reduced visual angle of mental imagery workspace
Imagery and Skill LearningFeltz and Landers, 1983 Meta-analysis of imagery studies in performance benefit
Generally accepted that visualization helps performance, (but not as much as actual practice)
Since then there’s been a hunt for the underlying neural mechanisms …
Putting Imagery: (Tayler and Shaw, 2002)- golfers imagine made or missed puts- missed-putt imagers did worse than no imagery at all!
though…
a little on visual substitution systems
can we use our other modalities to see?
tvss avss
Logistica
1. swap papers
(write email address on it!)
2. handout peer edit guideliens
DUE BY EMAILMONDAY 10pm
Extra slides
CSF
Change blindness.
Change blindness.
Change blindness.
