Department of Psychology, Washington University, St Louis, MO, USA.
Cogn Affect Behav Neurosci. 2012 Dec;12(4):748-60. doi: 10.3758/s13415-012-0110-1.
Previous recognition memory experiments have demonstrated that the ERPs elicited by correctly recognized test items differ according to whether the items were encoded in an emotionally arousing or an emotionally neutral context. It is not clear, however, whether these ERP differences depend on the explicit recognition of the items. We addressed this question in the present study by contrasting the ERPs elicited by test items encoded in emotionally negative or emotionally neutral study contexts, according to whether the items were correctly recognized or misclassified as new. Recognized items associated with emotional rather than neutral contexts elicited an early positive-going and a later negative-going effect that resembled the effects reported in prior studies. Relative to unrecognized items encoded in neutral contexts, unrecognized items encoded in emotional contexts elicited a sustained, frontal-maximum, positive-going effect that onset at about 200 ms poststimulus. This effect may reflect an influence of emotional arousal on the neural correlates of implicit memory.
先前的再认记忆实验表明，正确识别的测试项目所引发的 ERP 会根据项目是在情绪唤起还是情绪中性的背景下编码而有所不同。然而，这些 ERP 差异是否取决于项目的明确识别还不清楚。在本研究中，我们根据测试项目是正确识别还是错误分类为新的，对比了在情绪消极或情绪中性的学习背景下编码的项目所引发的 ERP，从而解决了这个问题。与中性背景相比，与情绪相关而非中性的背景下编码的被识别项目会引发一个早期的正相和一个后期的负相效应，这与之前研究中报告的效应相似。与中性背景下编码的未被识别项目相比，情绪背景下编码的未被识别项目会引发一个持续的、额部最大的正相效应，大约在刺激后 200 毫秒开始。这种效应可能反映了情绪唤醒对内隐记忆的神经相关物的影响。
