Psyc 2301 chapter five powerpoint 1(1)(1)
Transcript of Psyc 2301 chapter five powerpoint 1(1)(1)
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Chapter Five
Sensation and Perception
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Sensation vs. Perception
Sensation –What comes into our body through our sensory organs
Perception –What our brain does with that information
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A Little Test
• Unscramble the words Activity
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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)
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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
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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
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Sensory Adaptation
• Do you feel your clothes if they are still?
• How about hearing a sound that hums in
the background consistently?
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How do we know that we share the same reality?
• Color blindness• Blindness• Deafness• Schizophrenia
“There is no reality. There is only perception.”
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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
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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
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Sensory ProcessesSensory Processes
Smell (olfaction)Smell (olfaction)• Age and sex differencesAge and sex differences
Taste (gustation)Taste (gustation)• Taste budsTaste buds• MicrovilliMicrovilli
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What’s that Smell Activity???
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Flavor Activity
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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
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Theories of PerceptionTheories of Perception
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Theories of PerceptionTheories of Perception
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Sensation and Perception - intro.ppt © 2001 Laura Snodgrass, Ph.D.
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Homework
• Read Chapter Six
• See you Thursday!