采用雙選擇oddball實驗范式與事件相關電位(ERP)技術,探討了情緒對行為抑制的影響以及外傾性的調節作用。行為數據發現,相比標準刺激,被試對偏差刺激的反應時顯著更慢,證明實驗成功誘發了行為抑制效應。在內傾組,負性刺激下偏差與標準刺激反應時差值顯著長于正性刺激條件,而在外傾組無顯著差異。腦電數據發現,在N2成分上,內傾組在正性情緒下的波幅顯著小于負性和中性情緒,而在外傾組,不同情緒下的波幅不存在顯著差異。在P3成分上,內傾組在正性情緒下的波幅顯著大于負性和中性情緒,相反,外傾組在負性情緒下的波幅顯著大于正性和中性情緒。結果表明,情緒對行為抑制的影響受到了個體外傾性水平的調節。

Using a two-choice oddball task and event-related potential(ERP) measures, the present study investigated the impact of emotion on behavioral inhibition as well as the moderate effect of extraversion. Behavioral results showed that irrespective of emotional valence, longer response time for deviant stimuli than for standard stimuli was found, demonstrating there were behavioral inhibitory effects during deviant condition. Moreover, in introverted subjects, the response time difference between negative deviant stimuli and standard stimuli was larger than the response time difference between positive deviant stimuli and standard stimuli. ERP results found that in introverted subjects, positive stimuli lead to smaller N2 amplitudes than neutral and negative stimuli. However,in extroverted subjects, there was no difference under different emotion conditions. Moreover, introverted subjects showed larger P3 amplitudes for positive stimuli than neutral and negative stimuli. On the contrary, in extroverted subjects, negative stimuli elicited more pronounced P3 amplitudes than positive and neutral stimuli. The above results show that the impacts of emotion on behavioral inhibition are modulated by extraversion.