Neural dissociation of phonological and visual attention span disorders in developmental dyslexia: FMRI evidence from two case reports. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Brain and Language Année : 2012

Neural dissociation of phonological and visual attention span disorders in developmental dyslexia: FMRI evidence from two case reports.

Résumé

A dissociation between phonological and visual attention (VA) span disorders has been reported in dyslexic children. This study investigates whether this cognitively-based dissociation has a neurobiological counterpart through the investigation of two cases of developmental dyslexia. LL showed a phonological disorder but preserved VA span whereas FG exhibited the reverse pattern. During a phonological rhyme judgement task, LL showed decreased activation of the left inferior frontal gyrus whereas this region was activated at the level of the controls in FG. Conversely, during a visual categorization task, FG demonstrated decreased activation of the parietal lobules whereas these regions were activated in LL as in the controls. These contrasted patterns of brain activation thus mirror the cognitive disorders' dissociation. These findings provide the first evidence for an association between distinct brain mechanisms and distinct cognitive deficits in developmental dyslexia, emphasizing the importance of taking into account the heterogeneity of the reading disorder.

Dates et versions

hal-00798603 , version 1 (08-03-2013)

Identifiants

Citer

Carole Peyrin, Marie Lallier, Jean-François Démonet, Cyril Pernet, Monica Baciu, et al.. Neural dissociation of phonological and visual attention span disorders in developmental dyslexia: FMRI evidence from two case reports.. Brain and Language, 2012, 120 (3), pp.381-94. ⟨10.1016/j.bandl.2011.12.015⟩. ⟨hal-00798603⟩
80 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More