Verleger R
Department of Neurology, Medical University, Lübeck, Germany.
Psychophysiology. 1997 Mar;34(2):131-56. doi: 10.1111/j.1469-8986.1997.tb02125.x.
The stimulus evaluation view on P3 latency holds that P3 latency mainly reflects stimulus-processing time, in contrast to response-processing time. A review of the experimental evidence, however, leads to the conclusion that P3 is not a sensitive tool for separating between stimulus- and response-related processes. Rather, it appears that P3 latency is a sensitive index of any response-time changes when response times in the fast condition are brief, with its sensitivity decreasing when response times in the fast condition get longer. This regularity was confirmed by a detailed analysis of the published evidence from Sternberg's task and was not attributable to speed-accuracy trade-off or to different methods of parametrization. The structures generating the scalp P3b are involved both in stimulus processing and in response selection. Response selection may exert its effect on P3 in one of two ways; either directly, fully delaying P3 latency, or affecting a second P3 component (P-CR) only, thus having an attenuated effect on P3 latency.
关于P3潜伏期的刺激评估观点认为，与反应处理时间相反，P3潜伏期主要反映刺激处理时间。然而，对实验证据的回顾得出的结论是，P3并不是区分刺激相关和反应相关过程的敏感工具。相反，当快速条件下的反应时间较短时，P3潜伏期似乎是任何反应时间变化的敏感指标，而当快速条件下的反应时间变长时，其敏感性会降低。这一规律通过对斯滕伯格任务已发表证据的详细分析得到了证实，并且不归因于速度-准确性权衡或不同的参数化方法。产生头皮P3b的结构既参与刺激处理，也参与反应选择。反应选择可能通过两种方式之一对P3产生影响；要么直接完全延迟P3潜伏期，要么仅影响第二个P3成分（P-CR），从而对P3潜伏期产生减弱的影响。
