Phase separation of competing memories along the human hippocampal theta rhythm.
MEG
computational model
episodic memory
forgetting
hippocampus
human
memory competition
neuroscience
oscillations
proactive interference
Journal
eLife
ISSN: 2050-084X
Titre abrégé: Elife
Pays: England
ID NLM: 101579614
Informations de publication
Date de publication:
17 11 2022
17 11 2022
Historique:
received:
27
05
2022
accepted:
03
11
2022
entrez:
17
11
2022
pubmed:
18
11
2022
medline:
22
11
2022
Statut:
epublish
Résumé
Competition between overlapping memories is considered one of the major causes of forgetting, and it is still unknown how the human brain resolves such mnemonic conflict. In the present magnetoencephalography (MEG) study, we empirically tested a computational model that leverages an oscillating inhibition algorithm to minimise overlap between memories. We used a proactive interference task, where a reminder word could be associated with either a single image (non-competitive condition) or two competing images, and participants were asked to always recall the most recently learned word-image association. Time-resolved pattern classifiers were trained to detect the reactivated content of target and competitor memories from MEG sensor patterns, and the timing of these neural reactivations was analysed relative to the phase of the dominant hippocampal 3 Hz theta oscillation. In line with our pre-registered hypotheses, target and competitor reactivations locked to different phases of the hippocampal theta rhythm after several repeated recalls. Participants who behaviourally experienced lower levels of interference also showed larger phase separation between the two overlapping memories. The findings provide evidence that the temporal segregation of memories, orchestrated by slow oscillations, plays a functional role in resolving mnemonic competition by separating and prioritising relevant memories under conditions of high interference.
Identifiants
pubmed: 36394367
doi: 10.7554/eLife.80633
pii: 80633
pmc: PMC9671495
doi:
pii:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Informations de copyright
© 2022, Kerrén et al.
Déclaration de conflit d'intérêts
CK, Sv, BG, MW No competing interests declared
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