Action representation deficits in adolescents with developmental dyslexia.
Fiche publication
Date publication
juin 2021
Journal
Journal of neuropsychology
Auteurs
Membres identifiés du Cancéropôle Est :
Pr PAPAXANTHIS Charalambos
Tous les auteurs :
van de Walle de Ghelcke A, Skoura X, Edwards MG, Quercia P, Papaxanthis C
Lien Pubmed
Résumé
Developmental dyslexia (DD), a severe and frequent disorder of reading acquisition, is characterized by a diversity of cognitive and motor deficits whose interactions still remain under debate. Although deficits in the automatization of sensorimotor control have been highlighted, internal action representation allowing prediction has never before been investigated. In this study, we considered action representation of 18 adolescents with pure DD and 18 age-matched typical readers. Participants actually and mentally performed a visually guided pointing task involving strong spatiotemporal constraints (speed/accuracy trade-off paradigm). While actual and mental movement times of typical readers were isochronous and both conformed to Fitts' law, the movement times of dyslexics differed between conditions, and only the actual movement times conformed to Fitts' law. Furthermore, the quality of motor imagery correlated with word reading abilities. This suggests that the process of action representation is impaired in pure DD and supports the sensorimotor perspective of DD. Theoretical implications are discussed.
Mots clés
adolescence, developmental dyslexia, internal forward models, motor imagery
Référence
J Neuropsychol. 2021 06;15(2):215-234