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The role of experience in prioritizing hippocampal replay

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  • Marta Huelin Gorriz

    (University College London (UCL))

  • Masahiro Takigawa

    (University College London (UCL))

  • Daniel Bendor

    (University College London (UCL))

Abstract

During sleep, recent memories are replayed by the hippocampus, leading to their consolidation, with a higher priority given to salient experiences. To examine the role of replay in the selective strengthening of memories, we recorded large ensembles of hippocampal place cells while male rats ran repeated spatial trajectories on two linear tracks, differing in either their familiarity or number of laps run. We observed that during sleep, the rate of replay events for a given track increased proportionally with the number of spatial trajectories run by the animal. In contrast, the rate of sleep replay events decreased if the animal was more familiar with the track. Furthermore, we find that the cumulative number of awake replay events occurring during behavior, influenced by both the novelty and duration of an experience, predicts which memories are prioritized for sleep replay, providing a more parsimonious neural correlate for the selective strengthening of memories.

Suggested Citation

  • Marta Huelin Gorriz & Masahiro Takigawa & Daniel Bendor, 2023. "The role of experience in prioritizing hippocampal replay," Nature Communications, Nature, vol. 14(1), pages 1-15, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43939-z
    DOI: 10.1038/s41467-023-43939-z
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    References listed on IDEAS

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