Abstract
An attempt was made to demonstrate the coexistence of specific and nonspecific effects consequent to the same brain lesions in human Ss. Results indicated that these effects vary, in part, as a function of the tests employed. For example, scores on the Verbal and Performance Scales of the WAIS were shown to be related to specific cerebral areas. When an additional, although more complex, "nonverbal" instrument was employed the results were found to be unrelated to area of lateralization. It was concluded that before attempts to localize "where" effects are involved, one should first proceed to a careful analysis of "what" abilities are measured by the particular tests employed.

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