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• W4386793981 abstract "Abstract Episodic memory retrieval is associated with the holistic neocortical reinstatement of all event information; an effect driven by hippocampal pattern completion. However, whether holistic reinstatement occurs, and whether the hippocampus continues to drive reinstatement, after a period of consolidation is unclear. Theories of systems consolidation predict either a time-variant or -invariant role of the hippocampus in the holistic retrieval of episodic events. Here, we assessed whether episodic events continue to be reinstated holistically and whether the hippocampus continues to facilitate holistic reinstatement following a period of consolidation. Participants learnt ‘events’ that were composed of multiple overlapping pairs of event elements (e.g., person-location, object­location, location-person). Importantly, encoding occurred either immediately before or 24-hours before retrieval. Using fMRI during the retrieval of events, we show evidence for holistic reinstatement, as well as a correlation between reinstatement and hippocampal activity, regardless of whether retrieval occurred immediately or 24-hours after encoding. Thus, the hippocampus continues to contribute to holistic reinstatement after a delay. However, our results also revealed that holistic reinstatement can occur in the absence of a signature of hippocampal pattern completion after a delay (but not immediately following encoding). We therefore show that the hippocampal pattern completion contributes to, but is no longer necessary for, holistic reinstatement. Our results point to a consolidation process where the hippocampus and neocortex may work in a complementary manner, with the hippocampus still contributing to reinstatement despite not being necessary." @default.
• W4386793981 created "2023-09-16" @default.
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• W4386793981 date "2023-09-15" @default.
• W4386793981 modified "2023-09-27" @default.
• W4386793981 title "A continued but non-necessary role for hippocampal pattern completion in holistic episodic retrieval following consolidation" @default.
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• W4386793981 doi "https://doi.org/10.1101/2023.09.15.557911" @default.
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