Role of the superior parietal lobules in letter-identity processing within strings: FMRI evidence from skilled and dyslexic readers.

Détails

ID Serval
serval:BIB_648906B6B062
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Role of the superior parietal lobules in letter-identity processing within strings: FMRI evidence from skilled and dyslexic readers.
Périodique
Neuropsychologia
Auteur(s)
Reilhac C., Peyrin C., Démonet J.F., Valdois S.
ISSN
1873-3514 (Electronic)
ISSN-L
0028-3932
Statut éditorial
Publié
Date de publication
2013
Peer-reviewed
Oui
Volume
51
Numéro
4
Pages
601-612
Langue
anglais
Résumé
Traditionally, the ventral occipito-temporal (vOT) area, but not the superior parietal lobules (SPLs), is thought as belonging to the neural system of visual word recognition. However, some dyslexic children who exhibit a visual attention span disorder - i.e. poor multi-element parallel processing - further show reduced SPLs activation when engaged in visual multi-element categorization tasks. We investigated whether these parietal regions further contribute to letter-identity processing within strings. Adult skilled readers and dyslexic participants with a visual attention span disorder were administered a letter-string comparison task under fMRI. Dyslexic adults were less accurate than skilled readers to detect letter identity substitutions within strings. In skilled readers, letter identity differs related to enhanced activation of the left vOT. However, specific neural responses were further found in the superior and inferior parietal regions, including the SPLs bilaterally. Two brain regions that are specifically related to substituted letter detection, the left SPL and the left vOT, were less activated in dyslexic participants. These findings suggest that the left SPL, like the left vOT, may contribute to letter string processing.
Mots-clé
Parietal cortex, Word form system, Developmental dyslexia, Reading, Letter string processing, Visual word recognition
Pubmed
Web of science
Création de la notice
24/03/2013 11:16
Dernière modification de la notice
03/03/2018 17:50
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