1. Sensation & Perception
unit
m12-17
unit 05

2. m12 - Introduction to
Sensation

3. Psychophysics beginnings
Top-down vs Bottom-Up
Processing

4. Arocdnicg to rsceearch at Cmabrigde Uinervtisy,
it deosn’t mttaer in waht oredr the ltteers in a
wrod are, the olny iprmoatnt tihng is taht the frist
and lsat ltteer are in the rghit pcale. The rset can
be a toatl mses and you can sitll raed it wouthit
pobelrm. Tihs is buseace the huamn mnid deos
not raed ervey lteter by istlef, but the wrod as a
wlohe.

5. Left-side of room, close your eyes

6. Bs r vr mprtnt. Th mk hn nd hlp crps t grw. Thr r
mn knds f bs. N knd s gntl, bt t ds nt wrk hrd.
Nthr knd f b s vr mn, bt t s a hrd wrkr. Ths b mks
mch mr hn thn th gntl b. N mn thght tht mtng ths
tw bs wld b a gd d. H thght crssng th tw knds f bs
wld mk a gntl, hrd-wrkng b. Tht ws a bg mstk.

7. Bs r vr mprtnt. Th mk hn nd hlp crps t grw. Thr r
mn knds f bs. N knd s gntl, bt t ds nt wrk hrd.
Nthr knd f b s vr mn, bt t s a hrd wrkr. Ths b mks
mch mr hn thn th gntl b. N mn thght tht mtng ths
tw bs wld b a gd d. H thght crssng th tw knds f bs
wld mk a gntl, hrd-wrkng b. Tht ws a bg mstk.

8. Absolute threshold
Signal detection

9. Absolute threshold
Signal detection

10. 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”

11. 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”

12. Stairway to Heaven
“Oh here’s to my sweet Satan. The one whose
little path would make me sad, whose power is
Satan.”

13. Stairway to Heaven
“Oh here’s to my sweet Satan. The one whose
little path would make me sad, whose power is
Satan.”

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

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

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

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

18. “subliminal” associations

19. “subliminal” associations

20. “subliminal” associations

21. “subliminal” associations

22. “subliminal” associations

23. “subliminal” associations

24. Difference threshold (Just noticeable
difference)
Weber’s Law
Light must differ by 8%
Weight by 2%
Tone by 0.3%

25. Sensory adaptation
Sensory attention x
Cocktail party effect

26. What do you see?

27. Whato you see?
h do
W

28. Whato you see?
h do
W

29. m13 - Vision

30. Hue = wavelength
Intensity = amplitude

32. Normal Nearsighted Farsighted

34. Ganglion Cell Activity

35. Ganglion Cell Activity

36. Ganglion Cell Activity

38. Feature Detection Cells

39. Visual Processing

40. Visual Processing procedure

41. What do you see?

42. What do you see?

43. What do you see?

44. What do you see?

45. What do you see?

46. Color Vision
Young-Helmholtz
trichromatic theory
additive color
mixing

47. Color Vision
Opponent-Process Theory
after-image effects . . .

51. Maybe 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

52. Color Constancy

53. Color Constancy

54. Color Constancy

57. m14 - Hearing

58. Amplitude = volume
Frequency = pitch

59. Amplitude = volume
Frequency = pitch

62. Echolocation

63. Place Theory
Frequency Theory

64. Conduction Hearing Loss
Sensorineural Hearing Loss

65. m15 - Other Senses

66. Touch
Pressure, warmth, cold, and pain
• Only pressure has identifiable sensory
neurons
Pain is adaptive
• Hyperalgesia and Congenital Analgia
Phantom Limb
Gate Control Theory

68. Taste
• Sweet, sour, salty, bitter ...
and umami
• Super-tasters

70. Vestibular Sense vs Kinesthesis