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目的:研究刺激概率对颜色冲突信息诱发的事件相关电位N270的影响。方法:将四种颜色随机组合的刺激对分为三组:一组,在该组刺激中颜色相同的刺激对与不同的刺激对各占50％的概率;二组颜色不同的占85％,相同的占15％的概率;三组颜色不同的概率占15％,相同的占85％。受试者的任务:辨别前后呈现的两个刺激(第一个刺激S1,第二个刺激S2)颜色是否相同。结果:在颜色冲突(两个刺激颜色不同)事件中,S2刺激可诱发出一显著的事件相关电位负波(N270),该负波并不出现在非冲突事件中,且N270的振幅不受概率的影响。结论:N270是反映脑内特定冲突信息探知系统的神经电活动指标,与N2b不同,不受刺激概率的影响。
Objective: To study the effect of stimulation probability on the event-related potential N270 induced by color conflict information. Methods: The stimulus pairs randomly combined in four colors were divided into three groups: one group, with the same color in the group of stimuli and different stimuli each with a probability of 50%; two groups with different colors accounted for 85% The same accounted for 15% of the probability; the probability of the three groups of different colors accounted for 15%, the same accounted for 85%. Subject’s task: Identify whether the two stimuli (first stimulus S1, second stimulus S2) presented before and after the same color are the same. Results: The S2 stimulus elicited a significant negative event-related potential (N270) in the case of color conflicts (two stimuli differing in color) that did not occur in non-conflict events and the amplitude of N270 was unaffected The impact of probability. CONCLUSIONS: N270 is a neuroelectrical activity index reflecting the brain-specific information system for detection of conflict, unlike N2b, independent of the probability of stimulation.