Differential modulation of temporal and frontal components of the somatosensory N140 and the effect of interstimulus interval in a selective attention task

Tetsuo Kida*, Yoshiaki Nishihira, Toshiaki Wasaka, Hiroki Nakata, Masanori Sakamoto

*この研究の対応する著者

研究成果: Article査読

44 被引用数 (Scopus)

抄録

The modulation of the somatosensory N140 was examined in a selective attention task where a control condition was applied and the interstimulus interval (ISI) was varied. Electrical stimuli were randomly presented to the left index (p=0.4) and middle fingers (p=0.1), and right index (p=0.4) and middle fingers (p=0.1). In the attend-right condition, subjects were instructed to count silently the number of infrequent target stimuli presented to the right middle finger, and to the left middle finger in the attend-left condition. They had no task in the control condition. Each condition was performed with two different sets of ISI (mean 400 vs. 800 ms). The somatosensory N140 elicited by frequent standard stimuli was analyzed. The N140 amplitude was larger for the attended ERP compared to the control and unattended ERPs. This attention effect was more marked at the frontal electrodes compared to the temporal electrodes contralateral to the stimulation side. Furthermore, the attention effect at the frontal electrode was larger when the ISI was 800 ms than when it was 400 ms. The N140 amplitude did not differ between the control and unattended ERPs, which might show that a small processing negativity (PN) occurred during the control condition or difference in vigilance level between them. In conclusion, the early lateral ("temporal") and late midline ("frontal") components of the N1 (N140) show different behavior, and thus may have different functional significance. Enhancement of the attention effect at the frontal electrode in the longer ISI condition supports the hypothesis that it is related to stronger, voluntary maintenance of the attentional trace.

本文言語English
ページ(範囲)33-39
ページ数7
ジャーナルCognitive Brain Research
19
1
DOI
出版ステータスPublished - 2004 3月

ASJC Scopus subject areas

  • 行動神経科学
  • 認知神経科学
  • 実験心理学および認知心理学

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