Department of Computer Science and Technology, Tsinghua University, Beijing 100084, PR China.
Brain Cogn. 2010 Mar;72(2):289-99. doi: 10.1016/j.bandc.2009.09.013. Epub 2009 Oct 23.
In this paper, we aimed to verify the emotional facilitation effect in the picture-word interference task using event-related potentials. Twenty-one healthy subjects were asked to categorize the emotional valences of pictures accompanied by emotionally congruent, either centrally or laterally positioned Chinese words. For both the foveal and lateral word presentations, the reaction times were faster compared to the picture-only presentation. Compared to the picture-only presentation, P200 amplitude increased under the foveal word presentation condition and decreased under the lateral word presentation condition, indicating that more attentional resources were required when an accompanying word was in the center of a picture than when the word was in the lateral position. Latency of P300 was shorter in response to picture-word stimuli irrespective of word position, indicating that an emotionally congruent word facilitated the emotional processing of the target picture, which verified the emotional facilitation effect and was consistent with the results in psychology. The late positive component was more positive when the picture-word stimuli were more positive, which reflected the feature of positivity offset. The findings suggest that the time window for an emotional facilitation effect may be limited to processing aspects associated with P300 (i.e., affective evaluation).
在这项研究中，我们旨在使用事件相关电位（ERP）来验证图片-词汇干扰任务中的情绪促进效应。我们要求 21 名健康被试对伴随情绪一致的中文单词的图片进行情绪分类，这些单词分别位于中央或侧面位置。与仅呈现图片相比，无论是中央还是侧面呈现单词，被试的反应时间都更快。与仅呈现图片相比，在中央呈现单词的条件下 P200 振幅增加，在侧面呈现单词的条件下 P200 振幅减小，这表明当伴随单词位于图片中央时，需要更多的注意力资源。与仅呈现图片相比，P300 的潜伏期在对图片-词汇刺激的反应中更短，无论单词的位置如何，这表明情绪一致的单词促进了目标图片的情绪处理，这验证了情绪促进效应，与心理学的结果一致。当图片-词汇刺激更积极时，晚期正成分更为积极，这反映了正性偏移的特征。研究结果表明，情绪促进效应的时间窗口可能仅限于与 P300（即情感评估）相关的加工方面。
