... to the long-term memory. The role of the cerebral hemispheres in mental imagery is a widely debated subject, having to main theories into how the mental imagery is carried out. First is the propositional theory which is backed by Pylyshyn, who suggest that mental imagery is only propositional. This is then against a mix of both propositional and analog representations, using both descriptions and images to create a mental representation. Kosslyn favours the analog theory which seems to suggest on pictures can influence the mental imagery. Propositional representations are having the internal representation as a verbal description of the stimulus, whereas analog representations are more of a mental picture of the stimulus. Therefore the debate occurs as to which creates mental representations, words or pictures, or a mix of the two. Pylyshyn was a supporter of the propositional theory, which he believed had no place in cognitive psychology. He believes ...

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