Effects of ISI and stimulus probability on event-related go/nogo potentials after somatosensory stimulation

Hiroki Nakata, Koji Inui, Toshiaki Wasaka, Yohei Tamura, Tetsuo Kida, Ryusuke Kakigi

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The present study investigated the characteristics of the middle-latency negative potential of event-related potentials (ERPs) using somatosensory go/nogo tasks. We manipulated interstimulus interval (ISI) in Experiment 1 and stimulus probability in Experiment 2 and analyzed the subtracted difference waveform resulting from subtraction of the ERP evoked by the go stimulation from that evoked by the nogo stimulation. In Experiment 1, the peak latency of negativity became significantly longer as the ISI increased, but the peak amplitude was unchanged. The reaction time (RT) was longer with increasing ISI. In Experiment 2, manipulation of the stimulus probability yielded an increase in peak amplitude with decreasing probability of the nogo stimulus, but did not affect the latency. The RT increased as the probability of a nogo stimulus rose. Because manipulation of the ISI and stimulus probability elicited different brain activities, we hypothesized that manipulation of the ISI elicited a delay of the stimulus evaluation process including response inhibition, and that stimulus probability significantly affected the strength of the response inhibition process.

Original languageEnglish
Pages (from-to)293-299
Number of pages7
JournalExperimental Brain Research
Volume162
Issue number3
DOIs
Publication statusPublished - 2005 Apr

Keywords

  • Event-related potentials
  • ISI
  • Nogo potentials
  • Probability
  • Response inhibition

ASJC Scopus subject areas

  • Neuroscience(all)

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