Nerve, spinal cord and brain somatosensory evoked responses: a comparative study during electrical and magnetic peripheral nerve stimulation

Flora Zarola, Paolo M. Rossini

Research output: Contribution to journalArticlepeer-review

Abstract

Somatosensory evoked potentials (SEPs) and compound nerve action potentials (cNAPs) have been recorded in 15 subjects during electrical and magnetic nerve stimulation. Peripheral records were gathered at Erb's point and on nerve trunks at the elbow during median and ulnar nerve stimulation at the wrist. Erb responses to electrical stimulation were larger in amplitude and shorter in duration than the magnetic ones when 'electrical' and 'magnetic' compound muscle action potentials (cMAPs) of comparable amplitudes were elicited. SEPs were recorded respectively at Cv7 and on the somatosensory scalp areas contra- and ipsilateral to the stimulated side. SEPs showed a statistically significant difference in amplitude only for the brachial plexus response and for the 'cortical' N20-P25 complex; differences were not found between the magnetic and electrical central conduction times (CCTs) or for the peripheral nerve response latencies. Magnetic stimulation preferentially excited the motor and proprioceptive fibres when the nerve trunks were stimulated at motor threshold intensities.

Original languageEnglish
Pages (from-to)372-377
Number of pages6
JournalElectroencephalography and Clinical Neurophysiology - Evoked Potentials
Volume80
Issue number5
DOIs
Publication statusPublished - 1991

Keywords

  • Electrical stimulation
  • Magnetic stimulation
  • Nerve action potentials
  • Somatosensory evoked potentials

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience(all)

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