采用事件相关电位技术（ ERP），用侧抑制任务探讨了刺激和反应冲突的脑内时程动态变化。行为数据表明，冲突条件的反应时显著长于无冲突条件，表现出明显的干扰效应；脑电数据表明，在300－450ms内，反应冲突比无冲突诱发了一个更负的 ERP成分（ N300－450），主要分布于额顶部，偶极子溯源分析发现，这一负成分可能主要源于ACC；而刺激冲突与无冲突相比在350－450ms内，也诱发了一个更负的ERP成分（N350－450），该负成分可能主要源于丘脑附近。这一结果表明，刺激与反应冲突所涉及的大脑机制可能并不相同。%In the present study,the event-related potential( ERP) and flanker task was used to investigate the neural cor-relation of response conflict and stimulus conflict.Compared with the no conflict condition,behaviourally, there was obvious interference effect of the two conflict conditions.The brain electricity data showed that:response conflict e-licited a more negative ERP deflection than did the no conflict task in the time window from 300-450ms, and di-pole source analysis of difference wave indicated that one generator localized in ACC.Stimulus conflict elicited a more negative ERP deflection than did the no conflict task in the time window from 350-450ms, and dipole source analysis of difference wave indicated that one generator localized in thalamus.This result indicated that different conflicts may related to different brain mechanism.
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