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<dc:title xml:lang="en">Sleep-dependent memory consolidation and hippocampo-cortical interaction : the claustrum hypothesis</dc:title>
<dcterms:alternative xml:lang="fr">Consolidation mnésique dépendante du sommeil et interaction hippocampo-corticale : l’hypothèse du claustrum</dcterms:alternative>
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<dcterms:abstract xml:lang="fr">La consolidation mnésique se produit principalement pendant le sommeil, lorsque les souvenirs dépendants de l’hippocampe sont intégrés dans des réseaux corticaux distribués pour un stockage à long terme. Durant le sommeil à ondes lentes (SL), les oscillations lentes corticales organisent temporellement les interactions hippocampo-corticales, ce qui suppose l’intervention d’un coordinateur sous-cortical. Le claustrum, fine structure sous-corticale largement connectée aux régions corticales et parahippocampiques, constitue un excellent candidat pour ce rôle. L’activité claustrale augmente durant le SL, et son activation optogénétique facilite la consolidation mnésique dépendante du sommeil. Des enregistrements simultanés dans les régions corticales et hippocampiques révèlent que la stimulation claustrale induit une brève synchronisation dans la bande gamma pendant la phase d’up-state des oscillations lentes, suivie d’une transition coordonnée vers le downstate. Ces épisodes gamma transitoires favoriseraient le dialogue hippocampo-cortical soutenant la consolidation de la mémoire.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Memory consolidation primarily occurs during sleep, when hippocampus-dependent memories are integrated into distributed cortical networks for long-term storage. During slow-wave sleep (SWS), cortical slow oscillations temporally organize hippocampo–cortical interactions, requiring a subcortical coordinator. The claustrum, a thin nucleus extensively connected with cortical and parahippocampal regions, is a strong candidate for this role. We show that claustral activity increases during SWS and that its optogenetic activation enhances sleep-dependent memory consolidation. Simultaneous cortical and hippocampal recordings reveal that claustral stimulation induces brief gamma-band synchronization during the upstate of slow oscillations, followed by a coordinated transition to the down-state. We propose that these transient gamma episodes facilitate hippocampo–cortical communication underlying memory consolidation.</dcterms:abstract>
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