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Human Cortical Physiology Unit (Drs. Brasil-Neto, Cohen, Pascual-Leone, and Hallett), Human Motor Control Section, Medical Neurology Branch, National Institute of Neurological Disorders and Stroke, and Anesthesiology Service (Drs. Jabir and Wall), Warren G. Magnuson Clinical Center, National Institutes of Health, Bethesda, MD.
Reorganization of corticospinal pathways after spinal cord injury and amputations leads to increased excitability of motor pathways targeting muscles proximal to the level of interruption of efferents from the CNS. To study the timing of these changes, we have recorded motor evoked potentials (MEPs) in the arm muscles of three normal subjects before, during, and after anesthetic block of the forearm and hand. The amplitudes of MEPs from biceps, which was the muscle immediately proximal to the block, gradually increased with anesthesia and then returned to preanesthesia levels within approximately 20 minutes after anesthesia was ended. MEPs from the contralateral arm were unaffected. Such rapid changes strongly suggest unmasking of preexisting synaptic connections, due to disinhibition at cortical or subcortical levels, as the mechanism underlying acute modulation of motor outputs.
Address correspondence and reprint requests to Dr. Leonardo G. Cohen, Building 10, Room 5N226, NINDS, NIH, Bethesda, MD 20892.
Received September 20, 1991. Accepted for publication in final form December 9, 1991.
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