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NEUROLOGY 1988;38:904
© 1988 American Academy of Neurology

Noninvasive mapping of human motor cortex

Leonardo G. Cohen, MD and Mark Hallett, MD

From the Human Motor Control Section, Medical Neurology Branch, National Institute of Neurological and Communicative Disorders and Stroke, National Institutes of Health, Bethesda, MD.

Human motor cortex was stimulated using brief, high-voltage electrical stimulation. Constant-voltage stimuli were delivered through a bipolar surface stimulator with the anode placed at multiple positions on the scalp and the cathode situated 2.5 cm anterior to the anode. Recordings were bilateral from the abductor pollicis brevis, tibialis anterior, and risorius. We averaged the amplitudes of three muscle responses obtained from stimulation of each scalp position and assigned the resultant value to that position. The findings in eight normal volunteers were similar and reproducible. The maximal responses of the right hand were obtained when stimulating over C3, of the left hand when stimulating over C4, of the right and left legs when stimulating over Cz, and of the right side of the mouth when stimulating over T3.

Address correspondence and reprint requests to Dr. Cohen, Building 10, Room 5N226, NINCDS, National Institutes of Health, Bethesda, MD 20892.

Presented in part at the thirty-ninth annual meeting of the American Academy of Neurology, New York, NY, April 1987.

Received August 19, 1987. Accepted for publication in final form October 6, 1987.




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