The human supplementary motor area-proper does not receive direct somatosensory inputs from the periphery: Data from stereotactic depth somatosensory evoked potential recordings

C. Barba, M. Valeriani, D. Restuccia, G. Colicchio, G. Faraca, P. Tonali, F. Mauguière

Research output: Contribution to journalArticle

Abstract

Somatosensory evoked potentials to median nerve (MN) stimulation were recorded by stereotactically implanted electrodes in the frontal lobe of two epileptic patients in order to evaluate whether short-latency cortical responses could be generated in the supplementary motor area (SMA)-proper. In both patients two potentials, called P20 and N30 responses, showed a decreasing amplitude from the most superficial to the deepest contacts and were recorded in the white as well in the grey matter of the frontal lobe. Furthermore, no phase reversal of both P20 and N30 potentials was identifiable along electrode trajectories. Our results suggest that short-latency somatosensory evoked responses recorded in the SMA-proper contralateral to MN stimulation are volume conducted from remote cortical generators.

Original languageEnglish
Pages (from-to)161-164
Number of pages4
JournalNeuroscience Letters
Volume344
Issue number3
DOIs
Publication statusPublished - Jul 3 2003

Keywords

  • Epilepsy
  • Evoked potentials
  • Intracranial recordings
  • Somatosensory evoked potential
  • Supplementary motor area-proper

ASJC Scopus subject areas

  • Neuroscience(all)

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