Wynn Syanah C, Daselaar Sander M, Kessels Roy P C, Schutter Dennis J L G
Donders Institute for Brain, Cognition and Behaviour, Radboud University, the Netherlands.
Donders Institute for Brain, Cognition and Behaviour, Radboud University, the Netherlands.
Brain Cogn. 2019 Mar;130:20-27. doi: 10.1016/j.bandc.2018.07.003.
Subjectively perceived confidence is critically involved in distinguishing recollection from familiarity in episodic memory retrieval. However, the extent to which recollection and familiarity share similar electrophysiological processes associated with subjectively perceived memory confidence remains an open question. In addition, the role of memory encoding in subjectively perceived confidence during retrieval has not yet been investigated. To address these issues, an EEG study was performed in thirty healthy volunteers. During a memory task, participants encoded a subset of words while rating the words on pleasantness. Memory recognition and subjectively perceived confidence concerning these 'old' and additional 'new' words was tested. Results showed that during retrieval, correctly classifying an old item with high subjectively perceived confidence was associated with a parietal ERP and parietal theta power, while frontal theta activity was related to high-confident novelty processing. During the memory encoding phase, a parietal ERP and frontal theta oscillations were related to subsequent subjectively perceived memory confidence. Our findings provide the first evidence that subjectively perceived memory confidence is associated with distinct electrophysiological correlates during both memory encoding and retrieval.
在情景记忆检索中，主观感知的信心对于区分回忆和熟悉感至关重要。然而，回忆和熟悉感在多大程度上共享与主观感知的记忆信心相关的相似电生理过程，仍是一个悬而未决的问题。此外，记忆编码在检索过程中对主观感知信心的作用尚未得到研究。为了解决这些问题，对30名健康志愿者进行了一项脑电图研究。在记忆任务中，参与者对一部分单词进行编码，同时对这些单词的愉悦度进行评分。测试了对这些“旧”词和额外“新”词的记忆识别以及主观感知的信心。结果表明，在检索过程中，以高主观感知信心正确分类一个旧项目与顶叶事件相关电位和顶叶θ波功率有关，而额叶θ活动与高信心的新颖性处理有关。在记忆编码阶段，顶叶事件相关电位和额叶θ振荡与随后主观感知的记忆信心有关。我们的研究结果首次证明，主观感知的记忆信心在记忆编码和检索过程中都与不同的电生理相关因素有关。
