The role of parieto-temporal connectivity in pure neglect dyslexia.

Détails

ID Serval
serval:BIB_9CC73C92F189
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
The role of parieto-temporal connectivity in pure neglect dyslexia.
Périodique
Brain research
Auteur⸱e⸱s
Ptak R., Di Pietro M., Pignat J.M.
ISSN
1872-6240 (Electronic)
ISSN-L
0006-8993
Statut éditorial
Publié
Date de publication
01/10/2016
Peer-reviewed
Oui
Volume
1648
Numéro
Pt A
Pages
144-151
Langue
anglais
Notes
Publication types: Case Reports ; Journal Article
Publication Status: ppublish
Résumé
The initial stages of reading are characterised by parallel and effortless access to letters constituting a word. Neglect dyslexia is an acquired reading disorder characterised by omission or substitution of the initial or the final letters of words. Rarely, the disorder appears in a'pure' form that is, without other signs of spatial neglect. Neglect dyslexia is linked to damage involving the inferior parietal lobe and regions of the temporal lobe, but the precise anatomical basis of the pure form of the disorder is unknown. Here, we show that pure neglect dyslexia is associated with decreased structural connectivity between the inferior parietal and lateral temporal lobe. We examined patient DM, who following bilateral occipito-parietal damage presented left neglect dyslexia together with right visual field loss, but no signs of spatial neglect. DM's reading errors were affected by word length and were much more frequent for pseudowords than for existing words. Most errors were omissions or substitutions of the first or second letter, and the spatial distribution of errors was similar for stimuli presented left or right of fixation. The brain lesions of DM comprised the inferior and superior parietal lobule as well as the cuneus and precuneus of the left hemisphere, and the angular gyrus and lateral occipital cortex of the right hemisphere. Diffusion tensor imaging revealed bilateral decrease of fibre tracts connecting the inferior parietal lobule with the superior and middle temporal cortex. These findings suggest that parieto-temporal connections play a significant role for the deployment of attention within words during reading.

Mots-clé
Diffusion Tensor Imaging, Dyslexia/etiology, Dyslexia/physiopathology, Functional Laterality/physiology, Humans, Male, Middle Aged, Occipital Lobe/physiopathology, Parietal Lobe/physiopathology, Perceptual Disorders/complications, Reading, Temporal Lobe/physiopathology, Visual Fields/physiology, Disconnection, Neglect dyslexia, Parietal lobe, Spatial neglect, Temporal lobe, Visual attention
Pubmed
Web of science
Création de la notice
30/07/2016 11:43
Dernière modification de la notice
21/08/2019 6:17
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