Ramautar J R, Kok A, Ridderinkhof K R
Psychology Department, University of Amsterdam, Roetersstraat 15, 1018 WB, Amsterdam, The Netherlands.
Biol Psychol. 2006 Apr;72(1):96-109. doi: 10.1016/j.biopsycho.2005.08.001. Epub 2005 Sep 12.
The principal aim of the present study was to clarify how stop-signal modality affected the speed and efficacy of stopping, using ERP components as converging measures of stop processes. Both performance and ERP latency findings suggested faster processing of stop signals in the auditory than visual version of the stop task. The effects of successful versus unsuccessful stopping on the amplitude and topography of N2/P3 components elicited by the stop signals appeared to be largely independent of the modality of the stop signals. Stop signals elicited a fronto-central N2 that was much larger on unsuccessful than successful stop trials in stimulus-locked waveforms. N2 was followed by a P3 component that showed a fronto-central distribution on successful stop trials. P3 elicited on unsuccessful stop trials showed a posterior-parietal focus, but this topography was manifested more clearly in response-locked than stimulus-locked waveforms. A dipole source analyses confirmed these topographical differences of P3, and further showed that the location of the corresponding dipoles remained largely identical across the visual and auditory versions of the stop-signal task. Taken together, the present findings support the suggestion that ERP components in the stop task reflect endogenous aspects of stop-signal processing, such as effective inhibition of responses on successful stop trials and detection of errors on failed inhibition trials.
本研究的主要目的是，以事件相关电位（ERP）成分作为停止过程的聚合测量指标，阐明停止信号模态如何影响停止的速度和效率。行为表现和ERP潜伏期的研究结果均表明，在停止任务中，与视觉停止信号相比，听觉停止信号的处理速度更快。成功停止与未成功停止对停止信号诱发的N2/P3成分的波幅和地形图的影响，似乎在很大程度上与停止信号的模态无关。在刺激锁定波形中，停止信号诱发了一个额中央N2，在未成功停止试验中比成功停止试验中的波幅大得多。N2之后是一个P3成分，在成功停止试验中呈额中央分布。在未成功停止试验中诱发的P3表现为后顶叶聚焦，但这种地形图在反应锁定波形中比刺激锁定波形中表现得更明显。偶极子源分析证实了P3的这些地形图差异，并进一步表明，在停止信号任务的视觉和听觉版本中，相应偶极子的位置基本相同。综上所述，本研究结果支持以下观点：停止任务中的ERP成分反映了停止信号处理的内源性方面，例如在成功停止试验中对反应的有效抑制以及在抑制失败试验中对错误的检测。
