Download - Psyc 2301 chapter five powerpoint 1(1)(1)
Chapter Five
Sensation and Perception
Sensation vs. Perception
Sensation –What comes into our body through our sensory organs
Perception –What our brain does with that information
A Little Test
• Unscramble the words Activity
The Expectancy Effect
• Our expectations (i.e., preconceptions about what we are supposed to perceive) can influence our perception.
• We just proved this through our experiment!
• (80-90% of students)
How Do We Study Sensation?
Psychophysics• Study of the
relationship between a physical stimulus and your perception of it.
• Concerned mostly with physical attributes of the stimulus (e.g., amp & loudness).Gustav FechnerGustav Fechner
Father of Psychophysics
In other words…
Psychophysics: The point• To learn about our senses by
pushing them to the limits
Example: the auditory system• – Play a sound very quietly• – Eventually it’ll be so quiet, you may not be
able to hear it• – Absolute threshold: the loudness that people
say they can hear the sound 50% of the time
Sensory Adaptation
• Do you feel your clothes if they are still?
• How about hearing a sound that hums in
the background consistently?
How do we know that we share the same reality?
• Color blindness• Blindness• Deafness• Schizophrenia
“There is no reality. There is only perception.”
Sensory ProcessesSensory Processes
Visual information processingVisual information processing• Feature detectionFeature detection• Parallel processingParallel processing
Color visionColor vision• HueHue• SaturationSaturation• BrightnessBrightness• Color constancyColor constancy
p. 74p. 74
Sensory ProcessesSensory Processes
Hearing (audition)Hearing (audition)• Sound wavesSound waves
AmplitudeAmplitude
O decibels – absolute thresholdO decibels – absolute threshold
85+ - produce hearing loss85+ - produce hearing loss
140+ - rock bands140+ - rock bands• Locating soundsLocating sounds
Sound shadowSound shadow EcholocationEcholocation
A demonstrationA demonstration
Sensory ProcessesSensory Processes
Smell (olfaction)Smell (olfaction)• Age and sex differencesAge and sex differences
Taste (gustation)Taste (gustation)• Taste budsTaste buds• MicrovilliMicrovilli
What’s that Smell Activity???
Flavor Activity
Attention and PerceptionAttention and Perception
**Unattended stimuli and pop-out stimuli**Unattended stimuli and pop-out stimuli• Cocktail party effectCocktail party effect• Pop-out stimuliPop-out stimuli
**Multi-tasking**Multi-tasking
• http://youtu.be/xO_oEGHWSMU
Theories of PerceptionTheories of Perception
Theories of PerceptionTheories of Perception
Sensation and Perception - intro.ppt © 2001 Laura Snodgrass, Ph.D.
Homework
• Read Chapter Six
• See you Thursday!