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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 l.jpg

Perception 2

Figure 2 19 an example of context effects in perception l.jpg

Top-Down Processes

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

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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?

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Top-Down Processes

  • Perceptual Learning

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Top-Down Processes

  • Change Blindness

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Top-Down Processes

  • Word Superiority Effect






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Flying Animal

Bottom-Up and Top-Down Processing working together


Word Perception

  • Connectionist Model













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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

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Direct Perception vs. Constructivist Approach

  • Biological motion


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Optic flow

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Direct Perception

  • Affordances:

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

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Visual Agnosia

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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’

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Identification of Faces and Members of CategoriesProsopagnosia

The Fusiform Face Area:

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Thatcher illusion

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Subliminal Perception

  • Can subliminal messages change our behaviors?

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