Abstract
A patient with a left frontal arachnoidal endothelioma was examined at the bedside. A series of simple tasks was administered. These showed: 1. (1) An inability to carry out compounded instructions whether these were given verbally or presented as a visual model. 2. (2) An inability to carry out “symbolic” instructions. 3. (3) These incapacities did not depend on any difficulty in apprehending the instructions per se. 4. (4) Error utilization appeared related to ease of disequilibration as tested by the orienting reaction. These results are believed to be indicative of frontal lobe impairment despite the presence of more generalized brain damage which may serve to bring out in relief and carricature the essence of a disturbance produced by the local lesion.
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