Time-dependent transformations of memory representations differ along the long axis of the hippocampus.
Journal
Learning & memory (Cold Spring Harbor, N.Y.)
ISSN: 1549-5485
Titre abrégé: Learn Mem
Pays: United States
ID NLM: 9435678
Informations de publication
Date de publication:
09 2021
09 2021
Historique:
received:
18
05
2021
accepted:
09
07
2021
entrez:
17
8
2021
pubmed:
18
8
2021
medline:
18
1
2022
Statut:
epublish
Résumé
Research has shown that sleep is beneficial for the long-term retention of memories. According to theories of memory consolidation, memories are gradually reorganized, becoming supported by widespread, distributed cortical networks, particularly during postencoding periods of sleep. However, the effects of sleep on the organization of memories in the hippocampus itself remains less clear. In a 3-d study, participants encoded separate lists of word-image pairs differing in their opportunity for sleep-dependent consolidation. Pairs were initially studied either before or after an overnight sleep period, and were then restudied in a functional magnetic resonance imaging (fMRI) scan session. We used multivariate pattern similarity analyses to examine fine-grained effects of consolidation on memory representations in the hippocampus. We provide evidence for a dissociation along the long axis of the hippocampus that emerges with consolidation, such that representational patterns for object-word memories initially formed prior to sleep become differentiated in anterior hippocampus and more similar, or overlapping, in posterior hippocampus. Differentiation in anterior hippocampal representations correlated with subsequent behavioral performance. Furthermore, representational overlap in posterior hippocampus correlated with the duration of intervening slow wave sleep. Together, these results demonstrate that sleep-dependent consolidation promotes the reorganization of memory traces along the long axis of the hippocampus.
Identifiants
pubmed: 34400534
pii: 28/9/329
doi: 10.1101/lm.053438.121
pmc: PMC8372564
doi:
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
329-340Subventions
Organisme : NINDS NIH HHS
ID : K23 NS104252
Pays : United States
Organisme : NIMH NIH HHS
ID : R01 MH061492
Pays : United States
Informations de copyright
© 2021 Cowan et al.; Published by Cold Spring Harbor Laboratory Press.
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