Prestimulus theta activity predicts correct source memory retrieval
Prestimulus theta activity predicts correct source memory retrieval
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DOI：
10.1073/pnas.1014528108
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发表时间：
2011-06-28
影响因子：
11.1
通讯作者：
Ranganath, Charan
中科院分区：
文献类型：
--
作者：
Addante, Richard J.;Watrous, Andrew J.;Ranganath, Charan
最近的证据表明，刺激的处理会受到之前大脑活动模式的影响。在这里，我们研究刺激前振荡的大脑活动是否会影响提取情节记忆的能力。与条目识别成功但来源提取失败的试验相比，在呈现测试项目之前，theta频段(4-8赫兹)中的神经活动被增强，这引发了对先前研究情节的上下文细节的准确回忆(来源提取)。刺激后theta活动也与来源提取有关，刺激后theta的大小由刺激前theta效应的大小来预测。结果表明，在刺激开始之前正在进行的神经过程可能在大脑为成功的记忆提取做好准备方面发挥关键作用。
Recent evidence indicates that the processing of a stimulus can be influenced by preceding patterns of brain activity. Here we examine whether prestimulus oscillatory brain activity can influence the ability to retrieve episodic memories. Neural activity in the theta-frequency band (4-8 Hz) was enhanced before presentation of test items which elicited accurate recollection of contextual details of the prior study episode ("source retrieval"), relative to trials for which item recognition was successful but source retrieval failed. Poststimulus theta activity was also related to source retrieval, and the magnitude of poststimulus theta was predicted by the magnitude of the prestimulus theta effects. The results suggest that ongoing neural processes occurring before stimulus onset might play a critical role in readying the brain for successful memory retrieval.