P 3 during the auditory passive oddball paradigm with an infrequent-stimulus probability of 0.10

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  • 受動的な聴覚オドボール・パラダイムにおけるP3 : 低頻度刺激の出現確率10%における検討
  • ジュドウテキ ナ チョウカク オドボール パラダイム ニ オケル P3 テイヒンド シゲキ ノ シュツゲン カクリツ 10パーセント ニ オケル ケントウ

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P3 (P300) event-related brain potential (ERP) during the auditory oddball paradigm of passive condition (passive P3) was compared with the P3 during an active condition (active P3). In our previous study (Miyajima & Era, 1999), passive P3 did not appear with an infrequent-stimulus probability of 0.20 on 500/3000 Hz tone sequences. The present study was aimed to determine if passive P3 was elicited by reducing the infrequent-stimulus probability to 0.10. P3 responses were recorded from the subjects under both the passive condition and the active discrimination condition. The infrequent stimulus in the passive condition elicited a P3 component with the similar scalp distribution and latency to those from the active condition. These findings support that stimulus probability contributes to P3 generation in the passive oddball paradigm, and suggest that task relevance is related to P3 amplitude but not to P3 latency.

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