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Abstract
Abstract A selective impairment in mental transformation in the absence of an impairment in visuospatial working memory is described in a patient with a left parieto-occipital lesion. The patient showed a severe impairment on three tests of mental rotation, the Flags test, the Ratcliff Manikin test, and Shepard and Metzler's Mental Rotation task. She also showed an impairment in mental scanning, being unable to scan between locations on the Kosslyn, Ball, and Reiser (1978) Island task or to perform a modified version of the Brooks Letter task involving mental rotation. In contrast, her spatial working memory was normal, with no impairment on the Corsi Block Span task or the Brooks Matrix task (Baddeley&Lieberman, 1980). In addition, on a series of imagery generation tasks, she showed normal retrieval of visual and spatial imagery. The results are interpreted as supporting a dissociation between spatial working memory and the transformation of visuo-spatial imagery, and are discussed in relation to models ...
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