Overreliance on thematic knowledge in ...
Document type :
Article dans une revue scientifique: Article original
DOI :
PMID :
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Title :
Overreliance on thematic knowledge in semantic dementia: Evidence from an eye-tracking paradigm.
Author(s) :
Merck, Catherine [Auteur]
Noël, Audrey [Auteur]
Jamet, Eric [Auteur]
Robert, Maxime [Auteur]
Salmon, Anne [Auteur]
Belliard, Serge [Auteur]
KALENINE, SOLENE [Auteur]
Laboratoire Sciences Cognitives et Sciences Affectives - UMR 9193 [SCALab]
Noël, Audrey [Auteur]
Jamet, Eric [Auteur]
Robert, Maxime [Auteur]
Salmon, Anne [Auteur]
Belliard, Serge [Auteur]
KALENINE, SOLENE [Auteur]
Laboratoire Sciences Cognitives et Sciences Affectives - UMR 9193 [SCALab]
Journal title :
Neuropsychology
Abbreviated title :
Neuropsychology
Publication date :
2020-01-16
ISSN :
1931-1559
HAL domain(s) :
Sciences cognitives
English abstract : [en]
The present study explored two types of semantic relationships in semantic dementia (SD), that rely on functionally and neuroanatomically distinct semantic systems (taxonomic vs. thematic). We used the visual world paradigm ...
Show more >The present study explored two types of semantic relationships in semantic dementia (SD), that rely on functionally and neuroanatomically distinct semantic systems (taxonomic vs. thematic). We used the visual world paradigm coupled with eye-movement recordings, to gain an implicit, fine-grained and dynamic measure of semantic processing. Nine patients with SD and 15 healthy controls performed a simple word-to-picture matching task in which they had to identify each target among semantically related (taxonomic or thematic) competitors and unrelated distractors. We demonstrated different patterns of gaze fixations between patients with SD and controls: while patients with SD and controls were similarly sensitive to competition from taxonomically related pictures, patients with SD were far more sensitive than controls to thematically related competitors before identifying the targets. Moreover, most of the confusion errors made by patients with SD involved taxonomic distractors rather than thematic ones. We interpreted these findings as reflecting a semantic disequilibrium in SD, with increasing overreliance on thematic knowledge as taxonomic knowledge gradually deteriorates. We concluded that thematic relationships constitute a set of residual semantic knowledge and that their exaggerated activation in SD might certainly deserve further explorations to determine their specific role in this disease and notably, their influence on patients' abilities to deal with daily living activities. (PsycINFO Database Record (c) 2020 APA, all rights reserved).Show less >
Show more >The present study explored two types of semantic relationships in semantic dementia (SD), that rely on functionally and neuroanatomically distinct semantic systems (taxonomic vs. thematic). We used the visual world paradigm coupled with eye-movement recordings, to gain an implicit, fine-grained and dynamic measure of semantic processing. Nine patients with SD and 15 healthy controls performed a simple word-to-picture matching task in which they had to identify each target among semantically related (taxonomic or thematic) competitors and unrelated distractors. We demonstrated different patterns of gaze fixations between patients with SD and controls: while patients with SD and controls were similarly sensitive to competition from taxonomically related pictures, patients with SD were far more sensitive than controls to thematically related competitors before identifying the targets. Moreover, most of the confusion errors made by patients with SD involved taxonomic distractors rather than thematic ones. We interpreted these findings as reflecting a semantic disequilibrium in SD, with increasing overreliance on thematic knowledge as taxonomic knowledge gradually deteriorates. We concluded that thematic relationships constitute a set of residual semantic knowledge and that their exaggerated activation in SD might certainly deserve further explorations to determine their specific role in this disease and notably, their influence on patients' abilities to deal with daily living activities. (PsycINFO Database Record (c) 2020 APA, all rights reserved).Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Non spécifiée
Administrative institution(s) :
Université de Lille
CNRS
CHU Lille
CNRS
CHU Lille
Research team(s) :
Équipe Action, Vision et Apprentissage (AVA)
Submission date :
2020-01-21T08:48:23Z
2020-01-21T11:38:45Z
2020-02-14T09:58:34Z
2020-10-06T12:51:33Z
2020-01-21T11:38:45Z
2020-02-14T09:58:34Z
2020-10-06T12:51:33Z
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