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Images are secondary to propositions

Knowledge is encoded in an unconscious propositional medium that lies beneath both language and imagery. Imagery, by itself, is not of interest to cognitive science, because it can’t explain human knowledge.

Zenon Pylyshyn, 1973.
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Images are secondary to propositions
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Dual code theory explains knowledge adequately
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Quasi-pictorial images are adequate
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Zenon Pylyshyn
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