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Perception 2

Perception 2. Top-Down Processes. Figure 2-19 An example of context effects in perception. Perceptual Set Context Effects. The same physical stimulus can be interpreted differently depending on perceptual set, e.g., context effects.

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Perception 2

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  1. Perception 2

  2. Top-Down Processes Figure 2-19An example of context effects in perception.

  3. Perceptual SetContext Effects • The same physical stimulus can be interpreted differently depending on perceptual set, e.g., context effects. • When is the middle character the letter B and when is it the number 13?

  4. Top-Down Processes • Perceptual Learning

  5. Top-Down Processes • Change Blindness http://viscog.beckman.uiuc.edu/grafs/demos/10.html

  6. Top-Down Processes • Word Superiority Effect K K D WORK OWRK

  7. Flying Animal Bottom-Up and Top-Down Processing working together _at Word Perception • Connectionist Model Words Bat Letters B Fox Bat Fat Features (lines) I Rat Cat

  8. Figure 2-24 (p. 73)Example of stimuli used in the PET scan study of processing words. See text for explanation. Word Perception • Neuropsychological Perspective

  9. Direct Perception vs. Constructivist Approach • Biological motion • http://www.psico.univ.trieste.it/labs/acn-lab/eng_p/e051c1m1_curr.html

  10. Optic flow

  11. Direct Perception • Affordances: • Information from the stimulus that specifies how it can be used

  12. (Dorsal) (Ventral)

  13. Visual Agnosia http://scien.stanford.edu/class/psych221/projects/06/cukur/intro_files/image021.jpg

  14. Visual Agnosia • Associative Visual Agnosia • Can copy, but unaware what it is; cannot assign meaning to object • Difficulty in transferring visual info into words • Apperceptive Visual Agnosia • Cannot recognize by shape • Cannot copy drawings • Often involves ‘prosopagnosia’ http://scien.stanford.edu/class/psych221/projects/06/cukur/intro_files/image021.jpg

  15. Agnosia

  16. Identification of Faces and Members of CategoriesProsopagnosia The Fusiform Face Area: http://www.psy.vanderbilt.edu/faculty/gauthier/picts/mona_lisa.jpg

  17. Thatcher illusion http://www.face-rec.org/interesting-papers/Other/SchCarLed2003.pdf

  18. Subliminal Perception • Can subliminal messages change our behaviors?

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