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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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Perception 2


Top-Down Processes

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


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?


Top-Down Processes

  • Perceptual Learning


Top-Down Processes

  • Change Blindness

    http://viscog.beckman.uiuc.edu/grafs/demos/10.html


Top-Down Processes

  • Word Superiority Effect

K

K

D

WORK

OWRK


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


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


Direct Perception vs. Constructivist Approach

  • Biological motion

  • http://www.psico.univ.trieste.it/labs/acn-lab/eng_p/e051c1m1_curr.html


Optic flow


Direct Perception

  • Affordances:

    • Information from the stimulus that specifies how it can be used


(Dorsal)

(Ventral)


Visual Agnosia

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


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


Agnosia


Identification of Faces and Members of CategoriesProsopagnosia

The Fusiform Face Area:

http://www.psy.vanderbilt.edu/faculty/gauthier/picts/mona_lisa.jpg


Thatcher illusion

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


Subliminal Perception

  • Can subliminal messages change our behaviors?


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