Imagery.pptx Day6.pptx - Imagery Theories of Visual Imagery...

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Imagery
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Theories of Visual Imagery
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Kosslyn’s View Kosslyn’s Perceptual Anticipation Theory Mental images arise when one anticipates perceiving a scene or object so strongly that a representation is created in visual cortex. The theory involves a “closeness” assumption. Visual imagery and visual perception are necessarily similar. Images are spatial analogs, and thus directly comparable. Analog: a person or thing seen as comparable or equivalent to another Examples and relationship to visual imagery 3
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Pylyshyn’s View Pylyshyn’s Propositional View Imagery involves a transformation process from abstract to visual. Propositions: Representations of meaning in abstract form - (Think nonverbal knowledge concerning what things look like.) Example: how to create a visual image Role (or, rather, lack of role) for the visual cortex, and implications 4
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Testing Kosslyn’s and Pylyshyn’s Views Does imagery involve anticipation of perception? Case 1: Binocular rivalry experiments Two different stimuli presented, one to each eye. One stimulus is perceived. Which stimulus is perceived is determined by two main factors. Timing of presentation Facilitation from imagined stimuli Case 2: Interference from imagery tasks Visual and auditory images can affect perception. Congruent and noncongruent stimulus–distractor pairs have different effects. 5
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Testing Kosslyn’s and Pylyshyn’s Views Does imagery resemble perception? Case 3: Contributions of neuroscience Visual cortex (V1) has a role in generating visual imagery. Visual cortex appears to assist visual imagery under certain conditions. Type of task partly determines V1 activity.
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