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为进一步阐明事件关联电位（ＥＲＰｓ）中Ｐ３００成分的心理意义，在２２名健康青年男性被试者中，研究了靶与非靶二种视觉刺激概率均为０．５的条件下，对随机刺激序列和规则刺激序列的选择反应Ｐ３００成分的基本时空模式及其头皮分布特点。结果为：选择反应中靶与非靶刺激均诱发了明显的Ｐ３００，对信号的判断以及决策是其最基本的心理因素；在顶区靶Ｐ３００幅度大于非靶，且其潜伏期最短，而在额区非靶Ｐ３００幅度则大于靶Ｐ３００，且潜伏期在此区最短，这种特点表明顶区和额区在信号处理中功能作用不同；刺激序列结构规则化使Ｐ３００幅度降低，而对其潜伏期影响不大。
To further clarify the psychological significance of P300 in incident-associated potentials (ERPs), 22 healthy young male subjects were studied under the conditions of both visual stimuli of target and non-target were 0.5, Selective response of sequences and rules to stimulus sequences P300 components of the basic temporal pattern and scalp distribution characteristics. The results showed that both target and non-target stimuli induced obvious P300, and the signal judgment and decision were the most basic psychological factors. The amplitude of target P300 in the apical region was greater than that of non-target and the incubation period was the shortest. The region non-target P300 amplitude is greater than the target P300, and the shortest incubation period in this area, this feature shows that the top and frontal area in the signal processing function of different; stimulation sequence structure of the P300 amplitude decreased, while the impact of its latency is not Big.