Sensation & Perception
         unit
         m12-17
m12 - Introduction to
     Sensation
Psychophysics beginnings


Top-down vs Bottom-Up
      Processing
Absolute threshold

Signal detection
Absolute threshold

Signal detection
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 roa...
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 roa...
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.”
Another One Bites the
        Dust

 “Another one bites the dust
 Another one bites the dust
 Another one bites the dust”
Another One Bites the
        Dust

 “Another one bites the dust
 Another one bites the dust
 Another one bites the dust”
Another One Bites the
        Dust

 “It’s fun to smoke marijuana
 It’s fun to smoke marijuana
 It’s fun to smoke marijuan...
Another One Bites the
        Dust

 “It’s fun to smoke marijuana
 It’s fun to smoke marijuana
 It’s fun to smoke marijuan...
“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...
Sensory adaptation



Sensory attention        x

 Cocktail party effect
What do you see?
Whato you see?
  h do
W
Whato you see?
  h do
W
m13 - Vision
Hue = wavelength
Intensity = amplitude
Normal   Nearsighted   Farsighted
Ganglion Cell Activity
Ganglion Cell Activity
Ganglion Cell Activity
Feature Detection Cells
Visual Processing
Visual Processing procedure
What do you see?
What do you see?
What do you see?
What do you see?
What do you see?
Color Vision

Young-Helmholtz
trichromatic theory
  additive color
  mixing
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...
Color Constancy
m14 - Hearing
Amplitude = volume
 Frequency = pitch
Amplitude = volume
 Frequency = pitch
Echolocation
Place Theory

Frequency Theory
Conduction Hearing Loss

Sensorineural Hearing Loss
m15 - Other Senses
Touch
Pressure, warmth, cold, and pain
   •   Only pressure has identifiable sensory
       neurons
Pain is adaptive
   •  ...
Taste


•   Sweet, sour, salty, bitter ...
    and umami
•   Super-tasters
Vestibular Sense vs Kinesthesis
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Slides to accompany Sensation modules

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  • Subliminal stimulation exists/ persuasion does not
  • Tinnitus
  • Sensation Slides

    1. 1. Sensation & Perception unit m12-17
    2. 2. m12 - Introduction to Sensation
    3. 3. Psychophysics beginnings Top-down vs Bottom-Up Processing
    4. 4. Absolute threshold Signal detection
    5. 5. Absolute threshold Signal detection
    6. 6. 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”
    7. 7. 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”
    8. 8. Stairway to Heaven “Oh here’s to my sweet Satan. The one whose little path would make me sad, whose power is Satan.”
    9. 9. Stairway to Heaven “Oh here’s to my sweet Satan. The one whose little path would make me sad, whose power is Satan.”
    10. 10. Another One Bites the Dust “Another one bites the dust Another one bites the dust Another one bites the dust”
    11. 11. Another One Bites the Dust “Another one bites the dust Another one bites the dust Another one bites the dust”
    12. 12. Another One Bites the Dust “It’s fun to smoke marijuana It’s fun to smoke marijuana It’s fun to smoke marijuana”
    13. 13. Another One Bites the Dust “It’s fun to smoke marijuana It’s fun to smoke marijuana It’s fun to smoke marijuana”
    14. 14. “subliminal” associations
    15. 15. “subliminal” associations
    16. 16. “subliminal” associations
    17. 17. “subliminal” associations
    18. 18. “subliminal” associations
    19. 19. “subliminal” associations
    20. 20. Difference threshold (Just noticeable difference) Weber’s Law Light must differ by 8% Weight by 2% Tone by 0.3%
    21. 21. Sensory adaptation Sensory attention x Cocktail party effect
    22. 22. What do you see?
    23. 23. Whato you see? h do W
    24. 24. Whato you see? h do W
    25. 25. m13 - Vision
    26. 26. Hue = wavelength Intensity = amplitude
    27. 27. Normal Nearsighted Farsighted
    28. 28. Ganglion Cell Activity
    29. 29. Ganglion Cell Activity
    30. 30. Ganglion Cell Activity
    31. 31. Feature Detection Cells
    32. 32. Visual Processing
    33. 33. Visual Processing procedure
    34. 34. What do you see?
    35. 35. What do you see?
    36. 36. What do you see?
    37. 37. What do you see?
    38. 38. What do you see?
    39. 39. Color Vision Young-Helmholtz trichromatic theory additive color mixing
    40. 40. Color Vision Opponent-Process Theory after-image effects . . .
    41. 41. 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
    42. 42. Color Constancy
    43. 43. m14 - Hearing
    44. 44. Amplitude = volume Frequency = pitch
    45. 45. Amplitude = volume Frequency = pitch
    46. 46. Echolocation
    47. 47. Place Theory Frequency Theory
    48. 48. Conduction Hearing Loss Sensorineural Hearing Loss
    49. 49. m15 - Other Senses
    50. 50. Touch Pressure, warmth, cold, and pain • Only pressure has identifiable sensory neurons Pain is adaptive • Hyperalgesia and Congenital Analgia Phantom Limb Gate Control Theory
    51. 51. Taste • Sweet, sour, salty, bitter ... and umami • Super-tasters
    52. 52. Vestibular Sense vs Kinesthesis
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