Donders Institute for Brain, Cognition and Behaviour, Radboud University, the Netherlands; Department of Psychology, Bowdoin College, Brunswick, ME, United States.
Donders Institute for Brain, Cognition and Behaviour, Radboud University, the Netherlands.
Int J Psychophysiol. 2020 May;151:18-24. doi: 10.1016/j.ijpsycho.2020.02.007. Epub 2020 Feb 11.
Electrophysiological studies on recognition memory have identified several brain signals that are associated with subjective perceived confidence. However, the extent these brain signals reflect a generic process and are independent of the type of information recognized remains an open question. To address this issue, twenty-seven healthy volunteers performed an episodic memory task while their electro-encephalogram (EEG) was recorded. Participants encoded a set of abstract pictures, and subsequently rated their confidence on recognition decisions. Similar to results reported in previous studies using concrete words, we found retrieval-related theta power, FN400 and late positive component (LPC) effects. In contrast to previous studies using verbal material, a subsequent memory effect for encoding-related evoked theta power, sensitive to subjectively perceived memory confidence, was observed. Our findings suggest that brain signals that are associated with subjectively perceived confidence reflect specific encoding, but generic retrieval processes.
认知记忆的电生理研究已经确定了几个与主观感知信心相关的大脑信号。然而，这些大脑信号在多大程度上反映了一个通用的过程，并且与被识别的信息类型无关，仍然是一个悬而未决的问题。为了解决这个问题，二十七名健康志愿者在进行情景记忆任务的同时记录他们的脑电图（EEG）。参与者编码了一组抽象图片，然后对他们的识别决策的信心进行评分。与之前使用具体单词的研究报告的结果类似，我们发现了与检索相关的θ功率、FN400 和晚期正成分（LPC）效应。与之前使用言语材料的研究不同，我们观察到了与主观感知记忆信心相关的编码相关诱发θ功率的后续记忆效应。我们的发现表明，与主观感知信心相关的大脑信号反映了特定的编码，但通用的检索过程。
