Neural substrates of impaired categorical perception of phonemes in adult dyslexics: an fMRI study.

Détails

ID Serval
serval:BIB_5634EB2A634B
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Neural substrates of impaired categorical perception of phonemes in adult dyslexics: an fMRI study.
Périodique
Brain and Cognition
Auteur(s)
Ruff S., Marie N., Celsis P., Cardebat D., Démonet J.F.
ISSN
0278-2626 (Print)
ISSN-L
0278-2626
Statut éditorial
Publié
Date de publication
2003
Peer-reviewed
Oui
Volume
53
Numéro
2
Pages
331-334
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
Résumé
Phonological developmental dyslexics remain impaired in phonetic categorical perception (CP) even in adulthood. We studied the brain correlates of CP in dyslexics and controls using a block design fMRI protocol and stimuli from an phonetic continuum between natural /Pa/ and /Ta/ syllables. Subjects performed a pseudo-passive listening task which does not imply voluntary categorical judgment. In the control group, categorical deviant stimuli elicited specific activations in the left angular gyrus, the right inferior frontal gyrus and the right superior cingulate cortex. These regions were not activated in the dyslexic group in which activation was observed for acoustic but not phonetic changes in stimuli. Failures to activate key regions for language perception and auditory attention in dyslexic might account for persistent deficits in phonological awareness and reading tasks.
Mots-clé
Adult, Attention, Auditory Cortex/metabolism, Awareness, Dyslexia/diagnosis, Female, Humans, Magnetic Resonance Imaging, Male, Neuropsychological Tests, Phonetics, Speech Perception
Pubmed
Web of science
Création de la notice
24/03/2013 19:37
Dernière modification de la notice
03/03/2018 17:21
Données d'usage