Hippocampal replays appear after a single experience and incorporate greater detail with more experience

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作   者：

Berners-Lee, Alice;  Feng, Ting;  Silva, Delia;  Wu, Xiaojing;  Ambrose, Ellen R.;  Pfeiffer, Brad E.;  Foster, David J.; 

作者机构：

Univ Calif Berkeley;  Dept Neurosci;  UT Southwestern Med Ctr;  Philips Res North Amer;  Helen Wills Neurosci Inst;  LEK Life Sci;  NYU;  Comprehens Epilepsy Ctr;  Protenus; 

关键词：

TRIAL;  EPISODIC MEMORY;  CONSOLIDATION;  SEQUENCES;  PLACE CELLS;  REACTIVATION;  DYNAMICS;  REVERSE REPLAY; 

期刊名称：

Neuron

i s s n：

0896-6273

年卷期：

2022 年 110 卷 11 期

页   码：

1829-1842

页   码：

摘   要：

The hippocampus is implicated in memory formation, and neurons in the hippocampus take part in replay sequences that have been proposed to reflect memory of explored space. By recording from large ensembles of hippocampal neurons as rats explored various tracks, we show that sustained replay appears after a single experience. Further, we found that with repeated experience in a novel environment, replay slows down, taking more time to traverse the same trajectory. This effect was dependent on experience, not passage of time, and was environment specific. By investigating the slow-gamma (25???50 Hz) hover-and-jump dynamics within replays, we show that replay slows by adding more hover locations, increasing the resolution of the behavioral trajectory. We provide evidence that inhibition and cortical engagement both increase as replay slows. Thus, replays can reflect single experiences and evolve with re-exposure, in a manner consistent with the encoding of greater detail into replay memories with experience.