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NEUROLOGY 1987;37:82
© 1987 American Academy of Neurology

The source of 'paradoxical lateralization' of cortical evoked potentials to posterior tibial nerve stimulation

R. P. Lesser, H. Lüders, D. S. Dinner, J. Hahn, H. Morris, E. Wyllie and S. Resor

Department of Neurology, Cleveland Clinic Foundation, Cleveland, OH; and the Neurologic Institute of New York (Dr. Resor), New York, NY.

We report the potentials elicited by posterior tibial nerve stimulation and recorded simultaneously from the scalp and from electrodes within the interhemispheric fissure. The primary cortical potential was recorded from cortex contralateral but from scalp ipsilateral to the stimulated nerve. The scalp recordings thus demonstrated "paradoxical lateralization" as reported previously, and the similar morphology of the scalp and contralateral cortical recordings confirm that this "paradoxical lateralization" is most likely the result of a horizontal dipole located within the interhemispheric fissure.

Address correspondence and reprint requests to Dr. Lesser, Johns Hopkins Hospital, Room 2–147 Meyer Building, 600 N. Wolfe Street, Baltimore, MD 21205.

Received December 11, 1985. Accepted for publication April 9, 1986.




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