Replay, the default mode network and the cascaded memory systems model View Full Text


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Article Info

DATE

2022-08-15

AUTHORS

Karola Kaefer, Federico Stella, Bruce L. McNaughton, Francesco P. Battaglia

ABSTRACT

The spontaneous replay of patterns of activity related to past experiences and memories is a striking feature of brain activity, as is the coherent activation of sets of brain areas — particularly those comprising the default mode network (DMN) — during rest. We propose that these two phenomena are strongly intertwined and that their potential functions overlap. In the ‘cascaded memory systems model’ that we outline here, we hypothesize that the DMN forms the backbone for the propagation of replay, mediating interactions between the hippocampus and the neocortex that enable the consolidation of new memories. The DMN may also independently ignite replay cascades, which support reactivation of older memories or high-level semantic representations. We suggest that transient cortical activations, inducing long-range correlations across the neocortex, are a key mechanism supporting a hierarchy of representations that progresses from simple percepts to semantic representations of causes and, finally, to whole episodes. More... »

PAGES

628-640

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    43 schema:description The spontaneous replay of patterns of activity related to past experiences and memories is a striking feature of brain activity, as is the coherent activation of sets of brain areas — particularly those comprising the default mode network (DMN) — during rest. We propose that these two phenomena are strongly intertwined and that their potential functions overlap. In the ‘cascaded memory systems model’ that we outline here, we hypothesize that the DMN forms the backbone for the propagation of replay, mediating interactions between the hippocampus and the neocortex that enable the consolidation of new memories. The DMN may also independently ignite replay cascades, which support reactivation of older memories or high-level semantic representations. We suggest that transient cortical activations, inducing long-range correlations across the neocortex, are a key mechanism supporting a hierarchy of representations that progresses from simple percepts to semantic representations of causes and, finally, to whole episodes.
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