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State-dependent changes in the N20 component of the median nerve somatosensory evoked potential

EEG Systems Laboratory for Special Studies and the Department of Neurology, The Neurological Institute of New York, Columbia-Presbyterian Medical Center, New York, NY 10032.

Short-latency components of median nerve somatosensory evoked potentials are generally assumed to be unaffected by sleep and level of arousal. We found that sleep prolongs the latency and alters the morphology of the N20 component in normal subjects. These changes may represent differential effects of sleep on various elements contributing to generation of the N20. Failure to control for patient state may degrade the reliability of clinical somatosensory evoked potential testing.

Address correspondence and reprint requests to Dr. Emerson, The Neurological Institute, 710 West 168th Street, New York, NY 10032.

Supported in part by a grant from the Whitaker Foundation to J. A. S.

Presented in part at the thirty-eighth annual meeting of the American Academy of Neurology, New Orleans, LA, April 1986.

Received February 12, 1987. Accepted for publication in final form March 31, 1987.

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