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Vibration and muscle contraction affect somatosensory evoked potentials

Department of Neurology, University of California, Irvine, CA.

We recorded potentials evoked by specific somatosensory stimuli over peripheral nerve, spinal cord, and cerebral cortex. Vibration attenuated spinal and cerebral potentials evoked by mixed nerve and muscle spindle stimulation; in one subject that was tested, there was no effect on cutaneous input. Presynaptic inhibition of Ia input in the spinal cord and muscle spindle receptor occupancy are probably the responsible mechanisms. In contrast, muscle contraction attenuated cerebral potentials to both cutaneous and muscle spindle afferent volleys; central mechanisms modulating neurons in the dorsal columns nuclei, thalamus, or cerebral cortex are probably responsible.

Address correspondence and reprint requests to Dr. Starr, Department of Neurology, University of California, Irvine, CA 92717.

Supported in part by grant no. NS11876 from the National Institute of Health.

Accepted for publication September 27, 1984.

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