Woodward S H, Brown W S, Marsh J T, Dawson M E
Department of Psychology, University of Southern California, Pasadena.
Psychophysiology. 1991 Nov;28(6):609-18. doi: 10.1111/j.1469-8986.1991.tb01003.x.
An elementary neural model of the P3 is proposed in which the P3 is held to manifest a brief, widely-distributed, inhibitory event. A preliminary and indirect test of the model is described using secondary-task methodology. Manual reaction times were measured to probe clicks delivered during the presumed time-course of an auditory oddball P3. We observed that reaction times to probes presented after oddball stimuli were significantly slowed as compared to reaction times to probes presented after standards. The latency of maximum reaction time slowing corresponded generally to the latency of the P3. The latency of maximum reaction time slowing did not respond to a manipulation varying the latency of the P3. Thus, some of the obtained results were consistent with the P3-inhibition hypothesis, whereas others were not. Secondary-task methodology may provide a valuable new approach to understanding the late event-related potentials.
提出了一种P3的基本神经模型，其中P3被认为表现出一个短暂的、广泛分布的抑制性事件。描述了使用次要任务方法对该模型进行的初步间接测试。测量了手动反应时间，以探测在听觉oddball P3的假定时间进程中发出的点击声。我们观察到，与标准刺激后呈现的探测声相比，oddball刺激后呈现的探测声的反应时间显著减慢。最大反应时间减慢的潜伏期通常与P3的潜伏期相对应。最大反应时间减慢的潜伏期对改变P3潜伏期的操作没有反应。因此，一些获得的结果与P3抑制假说一致，而另一些则不一致。次要任务方法可能为理解晚期事件相关电位提供一种有价值的新方法。
