Modulation of somatosensory evoked potentials during force generation and relaxation

Toshiaki Wasaka*, Tetsuo Kida, Ryusuke Kakigi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


This study investigated the modulation of somatosensory evoked potentials (SEPs) during precisely controlled force generation and force relaxation in a visuomotor tracking task. Subjects were instructed to track a target line with a line that represented their own force generated by grip movement with the right hand as accurately as possible during concurrent electrical stimulation. The target force line moved up continuously from 0 to 20 % of maximal voluntary contraction (MVC) (the force generation phase: FG phase) and moved down from 20 to 0 % of MVC (the force relaxation phase: FR phase) in 7 s at a constant velocity. We separately obtained SEPs following electrical stimulation of the median nerve at the wrist in each phase. During the visuomotor tracking task, compared with the stationary condition, the N30 at Fz and P27 at C3′ showed a significant reduction in amplitude in the FG and FR phases. In addition, the N30 and P27 were significantly smaller in amplitude in the FG than FR phase. Although the average amount of force exertion was the same in the FG and FR phases, the modulation of SEP amplitude was larger in the FG phase. These results indicated that sensorimotor integration in the somatosensory area was dependent on the context of movement exertion.

Original languageEnglish
Pages (from-to)227-233
Number of pages7
JournalExperimental Brain Research
Issue number2
Publication statusPublished - 2012 May


  • Force generation
  • Force relaxation
  • Gating
  • Sensorimotor integration
  • SEPs

ASJC Scopus subject areas

  • Neuroscience(all)


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