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以要求按键作反应的视觉刺激序列同时记录了３９名正常人的视觉事件相关电位（Ｅｖｅｎｔ－ｒｅｌａｔｅｄｐｏｔｅｎｔｉａｌ，ＥＲＰ）和反应时间（Ｒｅａｃ－ｔｉｏｎｔｉｍｅ，ＲＴ）。结果表明Ｎ＿２、Ｐ＿３潜伏期和ＲＴ有明显的正相关关系，根据ＲＴ推测运动指令发出的时间在３０１～３４１ｍｓ之间，明显短于Ｐ＿３潜伏期，而与Ｎ＿２潜伏期接近。Ｎ＿２和Ｐ＿３的关系是连续的，Ｎ＿２潜伏期较Ｐ＿３更直接反映了刺激评价时间（Ｓｔｉｍｕｌｕｓｅｖａｌｕａｔｉｏｎｔｉｍｅ，ＳＥＴ）．Ｎ＿２可能反映了刺激评价加工，而Ｐ＿３则可能与场合的修正，调整应付未来的策略加工有关。ＳＥＴ是影响Ｎ＿２、Ｐ＿３和ＲＴ的共同因素。Ｐ＿３和ＲＴ是平行的关系，Ｎ＿２可能是它们共同的起点。
39 visual acuity events (ERPs) and Reac-tion times (RTs) of 39 normal subjects were recorded simultaneously with the visual stimulation sequence that required the key reaction. The results showed that there was a significant positive correlation between the latency of N_2 and P_3 and RT. According to RT, the time of motion instruction was between 301 ~ 341ms, which was obviously shorter than P_3 latency and close to N_2 latency. The relationship between N_2 and P_3 is continuous, and N_2 latency reflects the Stimulusevaluationtime (SET) more directly than P_3. N_2 may reflect the stimulus evaluation process, while P_3 may be related to the occasion of the revision, adjustment and processing strategies to deal with the future. SET is a common factor affecting N_2, P_3 and RT. P_3 and RT are parallel relationships, N_2 may be their common starting point.