Christensen C A, Ivkovich D, Drake K J
Vassar College, Poughkeepsie, NY 12604-0313, USA.
Psychophysiology. 2001 May;38(3):404-16.
Speed-accuracy instructions were manipulated in two symbolic stimulus-response compatibility tasks in an event-related potential study with young adults. For both tasks, the stimuli were the words left and right written in upper and lower case. Three late positive peaks (early P3, P3b, and P4) were seen in one task (with compatibility type blocked) with an additional peak (P3c) in the task that required identifying two stimulus attributes (compatibility type signaled by case). In both tasks, stimulus-response incompatibility and an emphasis on accuracy increased reaction time, made the P4 more prominent and increased its latency. With very rapid responding, P4 was not prominent because of overlap with the preceding peak. Functional characteristics of the peaks are discussed as well as potential sources of latency and amplitude measurement error when P3b is measured in a temporal window broad enough to include the P4.
在一项针对年轻人的事件相关电位研究中，在两个符号刺激-反应兼容性任务中对速度-准确性指令进行了操控。对于这两个任务，刺激都是用大写和小写书写的“左”和“右”这两个单词。在一个任务中（兼容性类型被分组呈现）观察到三个晚期正波峰（早期P3、P3b和P4），而在需要识别两个刺激属性的任务中（兼容性类型由大小写表示）还出现了一个额外的波峰（P3c）。在这两个任务中，刺激-反应不兼容性以及对准确性的强调增加了反应时间，使P4更加显著并延长了其潜伏期。在非常快速的反应情况下，由于与前一个波峰重叠，P4并不显著。讨论了这些波峰的功能特征，以及当在足够宽的时间窗口中测量P3b以包含P4时，潜伏期和幅度测量误差的潜在来源。
