Reactivation strength during cued recall is modulated by graph distance within cognitive maps.
Elife
; 122024 May 29.
Article
in En
| MEDLINE
| ID: mdl-38810249
ABSTRACT
Declarative memory retrieval is thought to involve reinstatement of neuronal activity patterns elicited and encoded during a prior learning episode. Furthermore, it is suggested that two mechanisms operate during reinstatement, dependent on task demands individual memory items can be reactivated simultaneously as a clustered occurrence or, alternatively, replayed sequentially as temporally separate instances. In the current study, participants learned associations between images that were embedded in a directed graph network and retained this information over a brief 8 min consolidation period. During a subsequent cued recall session, participants retrieved the learned information while undergoing magnetoencephalographic recording. Using a trained stimulus decoder, we found evidence for clustered reactivation of learned material. Reactivation strength of individual items during clustered reactivation decreased as a function of increasing graph distance, an ordering present solely for successful retrieval but not for retrieval failure. In line with previous research, we found evidence that sequential replay was dependent on retrieval performance and was most evident in low performers. The results provide evidence for distinct performance-dependent retrieval mechanisms, with graded clustered reactivation emerging as a plausible mechanism to search within abstract cognitive maps.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Mental Recall
/
Magnetoencephalography
/
Cues
Limits:
Adult
/
Female
/
Humans
/
Male
Language:
En
Journal:
Elife
Year:
2024
Document type:
Article
Affiliation country:
Germany
Country of publication:
United kingdom