Spatiotemporal neural pattern similarity supports episodic memory

Current Biology : CB
Yi LuGui Xue

Abstract

Formal computational models of human memory posit a central role of feature representations in episodic memory encoding and retrieval [1-4]. Correspondingly, fMRI studies have found that, in addition to activity level [5, 6], the neural activation pattern similarity across repetitions (i.e., self-similarity) was greater for subsequently remembered than forgotten items [7-9]. This self-similarity has been suggested to reflect pattern reinstatement due to study-phase retrieval [7, 10, 11]. However, the low temporal resolution of fMRI measures could determine neither the temporal precision of study-phase reinstatement nor the processing stage at which the reinstatement supported subsequent memory [12]. Meanwhile, although self-similarity has been shown to correlate with the activity level in the left lateral prefrontal cortex (LPFC) [10, 13], a causal link between left LPFC function and pattern similarity remains to be established. Combining transcranial direct current stimulation (tDCS) and EEG, we found that greater spatiotemporal pattern similarity (STPS) across repetitions of the same item (i.e., self-STPS) during encoding predicted better subsequent memory. The self-STPS located in the right frontal electrodes occurred approx...Continue Reading

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Citations

Apr 20, 2016·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Xiaoqian XiaoGui Xue
May 20, 2015·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Xiao ZhaoGui Xue
Jul 3, 2016·Neuroscience Letters·Filiz Gözenman, Marian E Berryhill
Apr 16, 2016·Hippocampus·Rebecca N van den HonertMarcia K Johnson
Apr 7, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Thomas Schreiner, Tobias Staudigl
Sep 8, 2017·Frontiers in Human Neuroscience·Jing QuLeilei Mei
Dec 9, 2020·Proceedings of the National Academy of Sciences of the United States of America·Jing LiuGui Xue
Jan 12, 2021·Frontiers in Neuroinformatics·Zitong Lu, Yixuan Ku
Dec 24, 2021·Neuropsychology, Development, and Cognition. Section B, Aging, Neuropsychology and Cognition·Verena R Sommer, Myriam C Sander

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