Sensation Unit slides
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Transcript of Sensation Unit slides
![Page 1: Sensation Unit slides](https://reader035.fdocuments.in/reader035/viewer/2022062404/55421095550346c0078b45de/html5/thumbnails/1.jpg)
Sensation & Perception unitm12-17
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m12 - Introduction to Sensation
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Psychophysics beginnings
Top-down vs Bottom-Up Processing
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Absolute threshold
Signal detection
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Absolute threshold
Signal detection
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“Yes there are two paths that you can go by, but in the long run there’s still time to change the road you’re on”
Stairway to Heaven
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“Yes there are two paths that you can go by, but in the long run there’s still time to change the road you’re on”
Stairway to Heaven
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“Oh here’s to my sweet Satan. The one whose little path would make me sad, whose power is Satan.”
Stairway to Heaven
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“Oh here’s to my sweet Satan. The one whose little path would make me sad, whose power is Satan.”
Stairway to Heaven
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Another One Bites the Dust
“Another one bites the dustAnother one bites the dustAnother one bites the dust”
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Another One Bites the Dust
“Another one bites the dustAnother one bites the dustAnother one bites the dust”
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Another One Bites the Dust
“It’s fun to smoke marijuanaIt’s fun to smoke marijuanaIt’s fun to smoke marijuana”
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Another One Bites the Dust
“It’s fun to smoke marijuanaIt’s fun to smoke marijuanaIt’s fun to smoke marijuana”
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“subliminal” associations
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“subliminal” associations
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“subliminal” associations
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“subliminal” associations
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“subliminal” associations
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“subliminal” associations
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Difference threshold (Just noticeable difference)
Weber’s Law
Light must differ by 8%
Weight by 2%
Tone by 0.3%
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Sensory adaptation
Sensory attention
Cocktail party effect
x
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What do you see?
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What do you see?Who
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What do you see?Who
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m13 - Vision
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Hue = wavelengthIntensity = amplitude
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Normal Nearsighted Farsighted
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Ganglion Cell Activity
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Ganglion Cell Activity
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Ganglion Cell Activity
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Feature Detection Cells
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Visual Processing
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Vis
ual P
roce
ssin
g pr
oced
ure
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What do you see?
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What do you see?
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What do you see?
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What do you see?
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What do you see?
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Young-Helmholtz trichromatic theory
additive color mixing
Color Vision
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Color Vision
Opponent-Process Theory
after-image effects . . .
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Color processing seems to occur in two stages:
Retinal cones respond like Young-Helmholtz trichromatic theory
Signal processed via opponent-process in the central nervous system
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Col
or C
onst
ancy
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m14 - Hearing
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Amplitude = volumeFrequency = pitch
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Amplitude = volumeFrequency = pitch
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Echolocation
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Place Theory
Frequency Theory
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Conduction Hearing Loss
Sensorineural Hearing Loss
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m15 - Other Senses
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TouchPressure, warmth, cold, and pain
• Only pressure has identifiable sensory neurons
Pain is adaptive
• Hyperalgesia and Congenital Analgia
Phantom Limb
Gate Control Theory
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Taste
• Sweet, sour, salty, bitter ... and umami
• Super-tasters
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Vestibular Sense vs Kinesthesis