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60 reviewsHippocampal reactivation of waking neuronal assemblies in sleep is a key initial step of systems consolidation. Nevertheless, it is unclear whether reactivated assemblies are static or whether they reorganize gradually over prolonged sleep. We tracked reactivated CA1 assembly patterns over 20 h of sleep/rest periodsand related them to assemblies seen before or after in a spatial learning paradigm using rats. We foundthat reactivated assembly patterns were gradually transformed and started to resemble those seen in thesubsequent recall session. Periods of rapid eye movement (REM) sleep and non-REM (NREM) had antagonistic roles: whereas NREM accelerated the assembly drift, REM countered it. Moreover, only a subset ofrate-changing pyramidal cells contributed to the drift, whereas stable-firing-rate cells maintained unalteredreactivation patterns. Our data suggest that prolonged sleep promotes the spontaneous reorganization ofspatial assemblies, which can contribute to daily cognitive map changes or encoding new learning situations.
