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• W4313352186 abstract "Abstract Episodic memory depends on the association of diverse attribute representations that are distributed across the neocortex, and evidence suggests that these attributes are linked, at least initially, by the hippocampus, which orchestrates retrieval and the offline replay of experience during memory consolidation. The dynamics that characterize this hippocampal-cortical dialogue, however, are only partly understood. Although it was originally proposed that replay is initiated in CA3, with the spontaneous emission of sharp-wave ripple (SWR) bursts, increasing evidence suggests that cortex may seed the process with partial information, leading to pattern completion in CA3 and subsequent global reactivation of the episode. A recent study has shown that the secondary motor cortex (M2), among other areas, carries two distinct types of representations: place cell-like activity, which relies on an intact hippocampus for its development, and responses tied to visuo-tactile cues — the ‘attributes’ of the experience, which do not require the hippocampus. Using two-photon Ca 2+ imaging, while simultaneously acquiring LFP from the ipsilateral CA1, we assessed the interactions among cortical retrieval of visuo-tactile attributes of previous experiences in a virtual environment, hippocampal SWR, and the cortical reinstatement of the spatial aspects of the same experiences. During rest after the experience, two types of reactivation events occurred, which separately conveyed information about spatial trajectories and visuo-tactile attributes. Reactivation of attribute information preceded that of trajectories in relation to hippocampal SWRs. Furthermore, paired reactivations of cue and trajectory information supported similar features of previous experiences. These results are consistent with the hypothesis that cortical retrieval of non-spatial attributes of recent experience seeds hippocampal reactivation of associated spatial sequences, which is followed by retrieval of episodic memory traces." @default.
• W4313352186 created "2023-01-06" @default.
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• W4313352186 date "2022-12-16" @default.
• W4313352186 modified "2023-10-16" @default.
• W4313352186 title "Cortical Reactivation of Non-Spatial and Spatial Memory Representations Coordinate with Hippocampus to Form a Memory Dialogue" @default.
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• W4313352186 doi "https://doi.org/10.1101/2022.12.16.520658" @default.
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