Determinant Factors of P300 Amplitude in Guilty Knowledge Tests

DOI Web Site 4 Citations
  • KUBO Kenta
    Graduate School of Integrated Arts and Sciences, Hiroshima University
  • NITTONO Hiroshi
    Graduate School of Integrated Arts and Sciences, Hiroshima University
  • MIYATANI Makoto
    Graduate School of Education, Hiroshima University

Bibliographic Information

Other Title
  • 有罪知識質問法におけるP300振幅の規定因
  • ユウザイ チシキ シツモンホウ ニ オケル P300 シンプク ノ キテイイン

Search this article

Description

It has been suggested that the experimental variables known to affect P300 amplitude can be described by three general factors : subjective probability, stimulus meaning, and information transmission. Based on this triarchic model, this study investigated the factor that determines P300 amplitude in guilty knowledge tests (GKTs). Twenty university students performed a three-stimulus visual oddball task using words. Half of the participants enacted a mock crime to increase the significance of infrequent nontarget words, whereas the other half did not. P300 amplitude was larger for critical items (infrequent nontarget words) than for noncritical items (frequent nontarget words) only in the mock-crime group. The amplitude difference remained significant in a dual-task condition wherein the participants performed an auditory discrimination task simultaneously with the visual oddball task. These results suggest that P300 amplitude is larger for critical stimuli in GKTs mainly because these stimuli are more meaningful and not because the stimuli are perceived as members of a rarer stimulus category. Moreover, attentional distraction does not appear to eliminate the amplitude difference between critical and noncritical items. (Japanese Journal of Physiological Psychology and Psychophysiology, 25 (3) : 267-275, 2007.)

Journal

Citations (4)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top