Elsevier

Neuropsychologia

Volume 30, Issue 7, July 1992, Pages 645-655
Neuropsychologia

Selective loss of imagery in a case of visual agnosia

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Abstract

Experiments were designed to examine the imagery abilities of an agnosic patient, M.S., who has consistently shown more deficits in recognizing visually, and in retrieving knowledge of living as compared with non-living items. Judgements of visual similarity were required for named objects and for object-pictures, as well as for the factual properties of these stimuli. The same disproportionate difficulty in processing living (‘natural’) objects was found in these tasks as well as in forced-choice recognition. In contrast, no deficit was found on analogous tasks concerned with word-shape similarities. These findings have bearing on concepts of semantic memory.

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