刺激性质和预测情境对负性情绪习得的影响:ERP研究

Effects of Type and Predictability of Stimulus on Emotion Acquisition: An ERP Study

探讨刺激性质和预测情境对负性情绪习得的影响及负性情绪产生的神经机制。采用事件相关电位(ERP)技术和条件性恐惧模型,18名被试在不同预测情境中做情绪判断任务,记录与负性非条件刺激(US)匹配和与中性US匹配的条件刺激(CS)诱发的ERP,考察负性情绪的产生机制。脑电结果显示:在可预测情境下,与中性US相比,负性US联结的CS诱发的P3波幅显著降低,i CNV波幅显著升高;在不可预测情境下,负性US和中性US联结的CS诱发的P3和i CNV波幅没有显著差异。此研究结果表明,刺激性质和预测情境交互影响负性情绪反应:在可预测情境下,负性情绪的产生由US性质决定;而在不可预测情境下,负性情绪的产生由刺激出现的预测情境决定。

The aim of the present study was to investigate the interaction of type and predictability of stimulus on emotion acquisition using event -related potentials （ERPs）. To examine this, eighteen subjects underwent a modified conditioned fear paradigm where a CS associated with the valence of a subsequent picture, differing in two dimensions ; （ 1 ） predictable vs. unpredictable pictures and （ 2 ） negative vs. neutral pictures. CS - elicited ERP results revealed, in the predictable condition, CS _ negative elicited significantly more negative deflections than CS -neutral across the P3 （360 -450 ms）and the initial contingent negative variation （iCNV） （500 -600 ms）components. In contrast,in the unpredictable condition, the two components showed similar negative deflection. These results indicate eliciting emotional response have an interaction between stimulus predictability and type.