Reduction in amplitude of the subcortical low- and high-frequency somatosensory evoked potentials during voluntary movement: An intracerebral recording study

Angelo Insola, Domenica Le Pera, Domenico Restuccia, Paolo Mazzone, Massimiliano Valeriani

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: To investigate whether the reduction of amplitude of the scalp somatosensory evoked potentials (SEPs) during movement (gating) is due to an attenuation of the afferent volley at subcortical level. Methods: Median nerve SEPs were recorded from 9 patients suffering from Parkinson's disease, who underwent implant of intracerebral (IC) electrodes in the subthalamic nucleus or in the globus pallidum. SEPs were recorded from Erb's point ipsilateral to stimulation, from the scalp surface and from the IC leads, at rest and during a voluntary flexo-extension movement of the stimulated wrist. The recorded IC traces were submitted to an off-line filtering by a 300-1500 bandpass to obtain the high-frequency SEP bursts. Results: IC leads recorded a triphasic component (P1-N1-P2) from 14 to 22 ms of latency. The amplitudes of the scalp N20, P20 and N30 potentials and of the IC triphasic component were significantly decreased during movement, while the peripheral N9 amplitude remained unchanged. Also the IC bursts, whose frequency was around 1000 Hz, were reduced in amplitude by the voluntary movement. Conclusions: Since the IC triphasic component is probably generated by neurons of the thalamic ventro-postero- lateral nucleus, which receive the somatosensory afferent volley, the P1-N1 amplitude reduction during movement suggests that the gating phenomenon involves also the subcortical structures.

Original languageEnglish
Pages (from-to)104-111
Number of pages8
JournalClinical Neurophysiology
Volume115
Issue number1
DOIs
Publication statusPublished - Jan 2004

Keywords

  • Deep brain stimulation
  • Gating
  • Somatosensory evoked potential
  • Thalamus

ASJC Scopus subject areas

  • Clinical Neurology
  • Radiology Nuclear Medicine and imaging
  • Neurology
  • Sensory Systems
  • Physiology (medical)

Fingerprint Dive into the research topics of 'Reduction in amplitude of the subcortical low- and high-frequency somatosensory evoked potentials during voluntary movement: An intracerebral recording study'. Together they form a unique fingerprint.

Cite this