sensation unit slides
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Sensation & Perception unitm12-17
m12 - Introduction to Sensation
Psychophysics beginnings
Top-down vs Bottom-Up Processing
Absolute threshold
Signal detection
Absolute threshold
Signal detection
“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
“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
“Oh here’s to my sweet Satan. The one whose little path would make me sad, whose power is Satan.”
Stairway to Heaven
“Oh here’s to my sweet Satan. The one whose little path would make me sad, whose power is Satan.”
Stairway to Heaven
Another One Bites the Dust
“Another one bites the dustAnother one bites the dustAnother one bites the dust”
Another One Bites the Dust
“Another one bites the dustAnother one bites the dustAnother one bites the dust”
Another One Bites the Dust
“It’s fun to smoke marijuanaIt’s fun to smoke marijuanaIt’s fun to smoke marijuana”
Another One Bites the Dust
“It’s fun to smoke marijuanaIt’s fun to smoke marijuanaIt’s fun to smoke marijuana”
“subliminal” associations
“subliminal” associations
“subliminal” associations
“subliminal” associations
“subliminal” associations
“subliminal” associations
Difference threshold (Just noticeable difference)
Weber’s Law
Light must differ by 8%
Weight by 2%
Tone by 0.3%
Sensory adaptation
Sensory attention
Cocktail party effect
x
What do you see?
What do you see?Who
What do you see?Who
m13 - Vision
Hue = wavelengthIntensity = amplitude
Normal Nearsighted Farsighted
Ganglion Cell Activity
Ganglion Cell Activity
Ganglion Cell Activity
Feature Detection Cells
Visual Processing
Vis
ual P
roce
ssin
g pr
oced
ure
What do you see?
What do you see?
What do you see?
What do you see?
What do you see?
Young-Helmholtz trichromatic theory
additive color mixing
Color Vision
Color Vision
Opponent-Process Theory
after-image effects . . .
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
Col
or C
onst
ancy
m14 - Hearing
Amplitude = volumeFrequency = pitch
Amplitude = volumeFrequency = pitch
Echolocation
Place Theory
Frequency Theory
Conduction Hearing Loss
Sensorineural Hearing Loss
m15 - Other Senses
TouchPressure, warmth, cold, and pain
• Only pressure has identifiable sensory neurons
Pain is adaptive
• Hyperalgesia and Congenital Analgia
Phantom Limb
Gate Control Theory
Taste
• Sweet, sour, salty, bitter ... and umami
• Super-tasters
Vestibular Sense vs Kinesthesis