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Transient neuropsychological abnormalities (including Gerstmann's Symdrome) during cortical stimulation

From the Cleveland Clinic Foundation, Cleveland, OH.

A patient with intractable partial seizures was intensively studied before surgical removal of the epileptogenic focus. A subdural electrode array was surgically placed over the left temporoparietal cortex to better localizethe epileptogenic focus and localize cortical function. In addition to speech and sensory findings, acalculia, agraphia, right-left confusion, and finger agnosia were transiently produced by electrical stimulation in the perisylvian area. These findings and their relationship to the controversy surrounding Gerstmann's syndrome are discussed.

Address correspondence and reprint requests to Dr. Morris, Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH 44106.

Accepted for publication November 7, 1983.

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