大脑如何处理刺激-反应冲突?来自侧化准备电位、头皮形貌和反应时间的新见解。

Marc E Lavoie, Johannes E A Stauder
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引用次数: 3

摘要

刺激-反应相容性(SRC)是指由于刺激和反应相互配合的方式,某些任务比其他任务执行得更容易、更好。为了评估大脑对刺激-反应冲突的反应,我们研究了12名大学生在位置阻断和条件混合设计下的行为(准确性和反应时间)和生理反应(侧化准备电位)的调节。结果表明,混合条件设计下,受试者的表现准确性较低,即时反应时间和LRP开始时间均有所延迟。混合设计在准确性、RTs和LRP起效潜伏期上也有更大的相容性效应。与这些发现一致,额中央区域较小的峰值激活表明在混合设计环境中需要更多的选择性抑制。尽管激活较小,但两种设计的地形分布相似。这些结果表明,在混合指令下,刺激码和反应码之间的转换时间更长,而相似的LRP地形表明,在两种类型的设计下,LRP的基础是共同的神经结构。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
How the Brain Process Stimulus-Response Conflict? New Insights from Lateralized Readiness Potentials Scalp Topography and Reaction Times.

Stimulus-Response Compatibility (SRC) refers to the fact that some tasks are performed easier and better than others because of the way stimuli and responses are paired with each other. To assess the brain responses to stimulus-response conflicts, we investigated the behavioral (accuracy and Reaction Times: RTs) as well as the physiological response (Lateralized Readiness Potentials: LRP) modulations in a positional blocked and a conditional mixed design in twelve university students. Results revealed that the performance was less accurate and the RTs, as well as the LRP onset, were delayed under the mixed conditional design. A greater compatibility effect was also noted on accuracy, RTs and LRP onset latency in the mixed design. Consistent with these findings, smaller peak activation at fronto-central areas suggests that more selective inhibition is needed in a mixed design context. Despite a smaller activation, the topographical distribution is similar in both designs. These results indicate that the translation time between stimulus- and response codes are greater under the mixed instruction, while the similar LRP topography suggests that common neural structures underlie LRPs in response to both type of designs.

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