ERPを指標とした競合と反応抑制の量的関係の検討

An ERP study on the quantitative relation between conflict and response inhibition

Takezawa Tomohiro

Nakao Mizuki

Nakao Takashi

Shiraishi Maiko

Miyatani Makoto

広島大学大学院教育学研究科紀要. 第三部, 教育人間科学関連領域

Bulletin of the Graduate School of Education, Hiroshima University. Part. Ⅲ, Education and Human Science

This study examined the hypothesis (Jones, Cho, Nystrom, Cohen, & Braver, 2002) that the amount of conflict raised by incongruent stimuli in a flanker task affects subsequent response inhibition, using eventrelated potentials. Eleven participants responded selectively with their hands to the stimuli that consisted of a target arrow neighbored by congruent or incongruent distractor arrows. The amount of conflict was manipulated by varying the number of incongruent distractors (i.e. the stimuli included two incongruent distractor arrows for small-conflict condition or four incongruent distractor arrows for large-conflict). The results showed the response times were longer for the large-conflict incongruent stimuli, followed by the small conflict, and then the congruent, suggesting more conflict in large-conflict stimuli. The response times (RTs) in congruent condition became longer when the conflict has been occurred in the preceding trial. But the RTs were almost the same regardless of whether the preceding trial was small-conflict or large-conflict trial. The latency of lateralized readiness potential which can be a measure of response preparation, for congruent condition also showed the delay by presence of conflict in preceding trial, but was not sensitive to the amount of conflict. P300 latency for congruent condition became longer after the conflict trial. These findings suggest that (1) there was no ERP evidence suggesting the quantitative relation between conflict and response inhibition, and (2) response inhibition triggered by conflict detection could contribute to the prolongation of the evaluation time for the stimuli.

競合検出処理

反応抑制

偏側性準備電位

P300

フランカー課題

conflict detection process

response inhibition

lateralized readiness potential

flanker task

Psychology [ 140 ]

jpn

広島大学大学院教育学研究科

国立情報学研究所

[ISSN] 1346-5562

[NCID] AA11625039