Article (Scientific journals)
Typicality in the brain during semantic and episodic memory decisions.
Delhaye, Emma; Coco, Moreno I; Bahri, Mohamed Ali et al.
2023In Neuropsychologia, 184, p. 108529
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Keywords :
Episodic memory; Semantic memory; Typicality; fMRI; Behavioral Neuroscience; Cognitive Neuroscience; Experimental and Cognitive Psychology
Abstract :
[en] Concept typicality is a key semantic dimension supporting the categorical organization of items based on their features, such that typical items share more features with other members of their category than atypical items, which are more distinctive. Typicality effects manifest in better accuracy and faster response times during categorization tasks, but higher performance for atypical items in episodic memory tasks, due to their distinctiveness. At a neural level, typicality has been linked to the anterior temporal lobe (ATL) and the inferior frontal gyrus (IFG) in semantic decision tasks, but patterns of brain activity during episodic memory tasks remain to be understood. We investigated the neural correlates of typicality in semantic and episodic memory to determine the brain regions associated with semantic typicality and uncover effects arising when items are reinstated during retrieval. In an fMRI study, 26 healthy young subjects first performed a category verification task on words representing typical and atypical concepts (encoding), and then completed a recognition memory task (retrieval). In line with previous literature, we observed higher accuracy and faster response times for typical items in the category verification task, while atypical items were better recognized in the episodic memory task. During category verification, univariate analyses revealed a greater involvement of the angular gyrus for typical items and the inferior frontal gyrus for atypical items. During the correct recognition of old items, regions belonging to the core recollection network were activated. We then compared the similarity of the representations from encoding to retrieval (ERS) using Representation Similarity Analyses. Results showed that typical items were reinstated more than atypical ones in several regions including the left precuneus and left anterior temporal lobe (ATL). This suggests that the correct retrieval of typical items requires finer-grained processing, evidenced by greater item-specific reinstatement, which is needed to resolve their confusability with other members of the category due to their higher feature similarity. Our findings confirm the centrality of the ATL in the processing of typicality while extending it to memory retrieval.
Disciplines :
Neurosciences & behavior
Author, co-author :
Delhaye, Emma  ;  Université de Liège - ULiège > GIGA > GIGA CRC In vivo Imaging - Aging & Memory
Coco, Moreno I;  CICPSI, Faculdade de Psicologia, Universidade de Lisboa, Portugal, Department of Psychology, Sapienza, University of Rome, Italy, IRCCS Santa Lucia, Rome, Italy
Bahri, Mohamed Ali  ;  Université de Liège - ULiège > GIGA > GIGA CRC In vivo Imaging - Aging & Memory ; Université de Liège - ULiège > Département des sciences cliniques > Neuroimagerie des troubles de la mémoire et revalidation cognitive
Raposo, Ana;  CICPSI, Faculdade de Psicologia, Universidade de Lisboa, Portugal
Language :
English
Title :
Typicality in the brain during semantic and episodic memory decisions.
Publication date :
08 March 2023
Journal title :
Neuropsychologia
ISSN :
0028-3932
eISSN :
1873-3514
Publisher :
Elsevier BV, England
Volume :
184
Pages :
108529
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FCT - Fundação para a Ciência e a Tecnologia [PT]
Fundação BIAL [PT]
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since 07 April 2023

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