Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, the Netherlands.
Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, the Netherlands; Department of Medical Psychology, Radboud University Medical Center, Nijmegen, the Netherlands.
Neurobiol Learn Mem. 2020 Feb;168:107140. doi: 10.1016/j.nlm.2019.107140. Epub 2019 Dec 13.
Previous research suggests involvement of parietal theta (3-7 Hz) power in subjectively perceived memory confidence during retrieval. To obtain further insights into the role of parietal theta activity during retrieval in processes associated with performance and confidence, fifty-four healthy volunteers performed a recognition memory task in a within-subject sham controlled transcranial alternating current stimulation (tACS) study. Participants encoded a subset of words at specific on-screen locations. During the retrieval phase accuracy and subjectively perceived confidence on item and source memory were evaluated while administering exogenous alternating field potentials. Results showed that 3.5 Hz tACS decreased subjectively perceived memory confidence as compared to sham and 8 Hz tACS. No tACS effects were found on accuracy regarding item and source memory. Our findings suggest that theta activity in the parietal cortex is implicated in subjectively perceived confidence in word recognition.
先前的研究表明，在提取过程中，顶叶θ波（3-7 Hz）的功率与被试主观感知的记忆信心有关。为了进一步了解提取过程中顶叶θ活动在与表现和信心相关的过程中的作用，54 名健康志愿者在一项基于个体的假刺激控制经颅交流电刺激（tACS）研究中进行了识别记忆任务。参与者在特定的屏幕位置上编码了一组单词。在检索阶段，在施加外源性交变电场的同时，评估项目和来源记忆的准确性和被试主观感知的信心。结果表明，与假刺激和 8 Hz tACS 相比，3.5 Hz tACS 降低了被试主观感知的记忆信心。在项目和来源记忆的准确性方面，没有发现 tACS 的影响。我们的研究结果表明，顶叶皮层的θ活动与单词识别的主观感知信心有关。
