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Speed of time-compressed forward replay flexibly changes in human episodic memory

Sebastian Michelmann, Bernhard P. Staresina, Howard Bowman, Simon Hanslmayr
doi: https://doi.org/10.1101/323774
Sebastian Michelmann
1University of Birmingham, School of Psychology, Centre for Human Brain Health;
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  • For correspondence: michelmann.seb@gmail.com
Bernhard P. Staresina
1University of Birmingham, School of Psychology, Centre for Human Brain Health;
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Howard Bowman
1University of Birmingham, School of Psychology, Centre for Human Brain Health;
2University of Kent, School of Computing
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Simon Hanslmayr
1University of Birmingham, School of Psychology, Centre for Human Brain Health;
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  • For correspondence: s.hanslmayr@bham.ac.uk
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Summary

Remembering information from continuous past episodes is a complex task. On the one hand, we must be able to recall events in a highly accurate way that often includes exact timing; on the other hand, we can ignore irrelevant details and skip to events of interest. We here track continuous episodes, consisting of different sub-events, as they are recalled from memory. In behavioral and MEG data, we show that memory replay is temporally compressed and proceeds in a forward direction. Neural replay is characterized by the reinstatement of temporal patterns from encoding. These fragments of activity reappear on a compressed timescale. Herein, the replay of sub-events takes longer than the transition from one sub-event to another. This identifies episodic memory replay as a dynamic process in which participants replay fragments of fine-grained temporal patterns and are able to skip flexibly across sub-events.

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Posted May 16, 2018.
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Speed of time-compressed forward replay flexibly changes in human episodic memory
Sebastian Michelmann, Bernhard P. Staresina, Howard Bowman, Simon Hanslmayr
bioRxiv 323774; doi: https://doi.org/10.1101/323774
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Speed of time-compressed forward replay flexibly changes in human episodic memory
Sebastian Michelmann, Bernhard P. Staresina, Howard Bowman, Simon Hanslmayr
bioRxiv 323774; doi: https://doi.org/10.1101/323774

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