Repetition and event-related potentials: Distinguishing early and late processes in affective picture perception
Repetition and event-related potentials: Distinguishing early and late processes in affective picture perception
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DOI：
10.1162/jocn.2007.19.4.577
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发表时间：
2007-04-01
影响因子：
3.2
通讯作者：
Bradley, Margaret M.
中科院分区：
文献类型：
--
作者：
Codispoti, Maurizio;Ferrari, Vera;Bradley, Margaret M.
本研究采用重复实验范式，观察了被试在观看图片过程中事件相关电位（ERP）的早、晚成分的情感调制性质。当参与者被动地观看情感或中性图片时，测量高密度ERP，这些图片重复多达90次。这两个ERP组件调制的情绪唤醒，与ERP引起时，观看愉快和不愉快的图片不同于当观看中性图片。另一方面，重复对这两个组成部分有不同的影响。早期枕颞分量（150-300毫秒）主要显示重复块内振幅的降低，但不随图片内容的变化而变化。晚centroparietal组成部分（300-600毫秒）之间和内块的重复显示出减少，与中性图片引发没有晚正电位在最后块的研究。数据表明，早期ERP主要反映强制性的知觉处理，促进了积极的短期记忆表征，而后期ERP反映了增加资源分配线索的动机相关的情感线索。
A repetition paradigm was used to assess the nature of affective modulation of early and late components of the event-related potential (ERP) during picture viewing. High-density ERPs were measured while participants passively viewed affective or neutral pictures that were repeated up to 90 times each. Both ERP components were modulated by emotional arousal, with ERPs elicited when viewing pleasant and unpleasant pictures different than when viewing neutral pictures. On the other hand, repetition had different effects on these two components. The early occipitotemporal component (150-300 msec) primarily showed a decrease in amplitude within a block of repetitions that did not differ as a function of picture content. The late centroparietal component (300-600 msec) showed a decrease both between and within blocks of repetitions, with neutral pictures eliciting no late positive potential in the final block of the study. The data suggest that the early ERP primarily reflects obligatory perceptual processing that is facilitated by active short-term memory representations, whereas the late ERP reflects increased resource allocation clue to the motivational relevance of affective cues.