Behavioural evidence favours image psychology
Image psychology predicts image rotation and scanning in addition to explaining them. Propositional theory, by contrast, does not predict image rotation and scanning.
At best, a propropositional theory can be patched together to explain these phenomena, but only in an ad hoc way that could just as well explain opposite results.

Stephen Kosslyn, Stephen Pinker, George E. Smith and Steven P. Schwartz (1979).
CONTEXT(Help)
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Artificial Intelligence »Artificial Intelligence
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Can computers think? [1] »Can computers think? [1]
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No: computers can't understand images [5b] »No: computers can't understand images [5b]
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Images represented by filled cells in an array »Images represented by filled cells in an array
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Images are Quasi-pictorial representations »Images are Quasi-pictorial representations
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Image Psychology »Image Psychology
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Experimental evidence »Experimental evidence
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Behavioural evidence »Behavioural evidence
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Behavioural evidence inconclusive »Behavioural evidence inconclusive
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Behavioural evidence favours image psychology
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Stephen Kosslyn »Stephen Kosslyn
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