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Sensation and Perception Liudexiang

Sensation and Perception Liudexiang

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Sensation and Perception Liudexiang

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  1. Sensation and PerceptionLiudexiang

  2. Brief Contents • Sensation • Perception

  3. The nature of sensation • Sensation: the basic experience of stimulating the body’s sense. • Absolute threshold: the least amount of energy that can be detected as a stimulation 50 percent of the time.

  4. Absolute threshold • Hearing: the tick of a watch from 6 meters in very quiet conditions • Vision: a candle flame seen from 50 kilometers on a clear, dark night • Taste: 1 gram of table salt in 500 liters of water • Smell: one drop of perfume diffused throughout a three-room apartment • Touch: the wing of a bee falling on the check from a height of 1centimeter

  5. The nature of sensation • Adaptation: an adjustment of the senses to the level of stimulation they are received. • Difference threshold or just-noticeable difference (jnd): the smallest change in stimulation that can be detected 50 percent of the time. • Weber’ law: the principle that the jnd for any given sense is a constant fraction or proportion of the stimulation being judged.

  6. Perception • Perception: the brain’s interpretation of sensory information so as to give it meaning.

  7. Perception:An optical illusion

  8. Perception:An optical illusion

  9. Perception:An optical illusion

  10. Perceptual organization: Random dots or something more?

  11. The reversible figure and ground

  12. The reversible figure and ground

  13. The reversible figure and ground

  14. Figure-ground relationship

  15. Some principles of perceptual organization • Proximity • Similarity • Closure • Continuity

  16. Proximity

  17. Proximity

  18. Similarity

  19. Closure

  20. Continuity

  21. Perceptual constancy • Perceptual constancy refers to the tendency to perceive objects as relatively stable and unchanging despite changing sensory information.

  22. Perceptual constancy • Size constancy • Shape constancy • Color constancy • Bright constancy

  23. Size constancy • The perception of an object as the same size regardless of the distance from it is viewed.

  24. Shape constancy • A tendency to see an object as the same shape no matter what angle it is viewed from.

  25. Shape constancy

  26. Color constancy • An inclination to perceive familiar objects as retaining their color despite changes in sensory information.

  27. Brightness constancy • The perception of brightness as the same, even though the amount of light reaching the retina changes.

  28. Perception of distance and depthsuperposition:

  29. Perception of distance and depthelevation as a visual cue:

  30. Perception of distance and depthshadowing:

  31. Visual illusion:reversible figure

  32. Visual illusion:misleading depth cues

  33. Visual illusion:misleading depth cues

  34. Visual illusion:

  35. The end