Differential modulation of the short- and long-latency somatosensory evoked potentials in a forewarned reaction time task

Tetsuo Kida, Yoshiaki Nishihira, Toshiaki Wasaka, Yukie Sakajiri, Toshiki Tazoe

研究成果: Article査読

34 被引用数 (Scopus)

抄録

Objective: We investigated modulation of the short- and long-latency somatosensory evoked potentials (SEPs) in a forewarned reaction time task. Methods: A pair of warning (auditory) and imperative stimuli (somatosensory) was presented with a 2 s interstimulus interval. In movement condition, subjects responded by grip movement with the ipsilateral hand to the somatosensory stimulation when the imperative stimulus was presented. In counting condition, they silently counted the number of imperative stimuli. The SEPs in response to the imperative stimuli were recorded. Results: Frontal N30 and central N60 amplitudes were significantly smaller in the movement than in the counting or rest conditions. None of the short-latency components differed between the counting and rest conditions. In contrast to the short-latency components, P80 was significantly larger in the counting than in the rest condition, and showed a further increase from the counting to the movement condition. The N140 amplitude was significantly larger in the movement than the rest condition, but was not changed between the counting and the rest conditions. Conclusions: The attenuation of the frontal N30 and central N60, and the enhancement of the P80 and possibly the N140 resulted from the centrifugal mechanism. The present findings may show the different effects of voluntary movement on the early and subsequent cortical processing of the relevant somatosensory information requiring a behavioral response. Significance: The present study demonstrated the differential modulation of short- and long-latency components of SEPs in a forewarned reaction time task.

本文言語English
ページ(範囲)2223-2230
ページ数8
ジャーナルClinical Neurophysiology
115
10
DOI
出版ステータスPublished - 2004 10

ASJC Scopus subject areas

  • 臨床神経学
  • 放射線学、核医学およびイメージング
  • 神経学
  • 感覚系
  • 生理学(医学)

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