情绪Stroop任务的事件相关电位时空模式分析

目的 考察情绪Stroop实验范式的事件相关电位(ERP)时空模式.方法 13名受试者从事情感词汇的颜色判别任务,同时记录其19通道的ERP,实验采用单因素三水平(情绪词效价:正性、中性、负性)重复测量析因设计,ERP分析结果利用F值的统计参数映像呈现.结果 行为指标反应时间和反应正误率均无显著差异.ERP的F值参数映射示显著情感效应主要出现在3个时段:枕区(200～220 ms);左前额及中央额区(270～300 ms);枕顶区(左560～580 ms、右620～630 ms).结论 任务无关的情绪词加工在不同阶段涉及广泛脑区,ERP在情绪研究和评价方面比行为指标更为敏感.

Spatiotemporal pattern analysis of event-related potentials elicited by emotional Stroop task

Objective To investigate the spatiotemporal pattern of event-related potentials(ERPs)induced by emotional Stroop task.Methods The ERPs of 19 channels were recorded from 13 healthy subjects while performing emotional Stroop task by pressing the buttons representing the colors in which the words denoting different emotions were displayed.A repeated-measures factorial design was adopted with three levels(word valence:positive,neutral and negative).The result of ERP analysis was presented in the form of statistical parametric mapping(SPM)of F value.Results No significant difference was found in either reaction time or accuracy.The SPM of ERPs suggested significant emotional valence effects in the occipital region(200-220 ms),the left and central frontal regions(270-300 ms),and the bilateral temporal and parietal cortex(560-580 and 620-630 ms,respectively).Conclusion Processing of task-irrelevant emotional valence information involves the dynamic operation of extensive brain regions.The ERPs are more sensitive than the behavioral indices in emotional evaluation.