Abstract
Abstract This study examines the performance of patients with right hemisphere lesions and neurologically intact control subjects on three spatial tasks designed to access spatial representation unconfounded by enabling skills. The three tasks were: (1) imagining a map of the United States and verbally estimating distances between all possible pairs of nine major cities, (2) locating these cities on an outline map of the United States, and (3) verbally estimating distances between all possible pairs of nine symbols which were placed on a page in the same spatial arrangment as the nine cities. The right hemisphere group performed significantly worse than controls on only the first task. Since performance on the latter two tasks was equivalent, the significant group differences cannot be due to ignorance of the city locations or inability to verbally estimate distances. Our results suggest that the visuo-spatial disorder commonly seen after right hemisphere lesions is not limited to tasks which involve spatial perception in the conventional sense, but also involves the internal representation of spatial information.
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