A PET study of word generation in Huntington's disease: effects of lexical competition and verb/noun category.

Détails

ID Serval
serval:BIB_B23DE32742F3
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
A PET study of word generation in Huntington's disease: effects of lexical competition and verb/noun category.
Périodique
Brain and Language
Auteur(s)
Lepron E., Péran P., Cardebat D., Démonet J.F.
ISSN
1090-2155 (Electronic)
ISSN-L
0093-934X
Statut éditorial
Publié
Date de publication
2009
Peer-reviewed
Oui
Volume
110
Numéro
2
Pages
49-60
Langue
anglais
Notes
Publication types: Journal ArticlePublication Status: ppublish
Résumé
Huntington's disease (HD) patients show language production deficits that have been conceptualized as a consequence of executive disorders, e.g. selection deficit between candidate words or switching between word categories. More recently, a deficit of word generation specific to verbs has been reported, which might relate to impaired action representations in HD. We studied the brain correlates of language impairment in HD using H(2)O(15) positron emission tomography (PET). The activation task consisted of generation of semantically appropriate nouns and verbs in dominant (low lexical selection) and selective conditions (high lexical selection). Reaction times were longer and number of errors was higher in 12 non-demented HD than in 17 age-matched controls in all conditions. In both groups, the selective condition yielded longer reaction time and a greater number of errors than the dominant one. PET data revealed that, in control subjects, the left inferior temporal gyrus was involved in the selective condition whereas it was not in HD. Moreover, activity in the anterior cingulate and the inferior frontal gyri was correlated with behavioral performance in control subjects only. In HD, the lack of implication of these regions, already shown to be crucial in lexical selection, might have been partly compensated by the activation in the left supramarginal gyrus (phonological loop activity) and the right inferior frontal gyrus (effortful retrieval processes), which might support accessory language strategies allowing patients to achieve word generation.
Mots-clé
Analysis of Variance, Brain/physiopathology, Brain/radionuclide imaging, Brain Mapping, Female, Humans, Huntington Disease/physiopathology, Huntington Disease/radionuclide imaging, Language Tests, Linguistics, Male, Mental Processes/physiology, Middle Aged, Oxygen Radioisotopes, Positron-Emission Tomography, Reaction Time, Task Performance and Analysis, Vocabulary
Pubmed
Web of science
Création de la notice
24/03/2013 20:19
Dernière modification de la notice
20/08/2019 16:20
Données d'usage