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     <dc:title xml:lang="fr">Corrélats cérébraux en IRM multimodale du switching au cours de tâches de fluences verbales chez des femmes déprimées</dc:title>
     <dcterms:alternative xml:lang="en">Multimodal MRI cerebral correlates of verbal fluency switching in women with depression</dcterms:alternative>
     <dc:subject xml:lang="fr">Dépression</dc:subject><dc:subject xml:lang="fr">Biomarqueurs</dc:subject><dc:subject xml:lang="fr">Tâches de fluences verbales</dc:subject><dc:subject xml:lang="fr">Analyse automatisée</dc:subject><dc:subject xml:lang="fr">Epaisseur corticale</dc:subject><dc:subject xml:lang="fr">Fraction d’Anisotropie</dc:subject>
     <dc:subject xml:lang="en">Major depressive disorder</dc:subject><dc:subject xml:lang="en">Biomarker</dc:subject><dc:subject xml:lang="en">Verbal fluency task</dc:subject><dc:subject xml:lang="en">Automatic-analysis</dc:subject><dc:subject xml:lang="en">Cortical Thickness</dc:subject><dc:subject xml:lang="en">Fractional Anisotropy</dc:subject><tef:sujetRameau><tef:vedetteRameauNomCommun>
						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="027231828">Dépression</tef:elementdEntree>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="027824772">Troubles de la parole</tef:elementdEntree>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="027623106">Marqueurs biologiques</tef:elementdEntree>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="02916818X">Cortex cérébral</tef:elementdEntree><tef:subdivision autoriteSource="Sudoc" type="subdivisionDeSujet" autoriteExterne="028921011">Imagerie par résonance magnétique</tef:subdivision>
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     <dcterms:abstract xml:lang="fr">L'analyse qualitative des tâches de fluence verbale (TFV) constitue un biomarqueur candidat de la dépression mais ses corrélats cérébraux sont mal connus. Les scores qualitatifs en TVF (scores de clustering i e. nombre de mots produits dans les clusters et de switching i.e. nombre de transition entre les clusters) et les IRM de 26 femmes déprimées et 25 volontaires saines ont été acquis. Les scores de TVF étaient obtenus de façon automatisée, l'épaisseur corticale (EC) et la fraction d’anisotropie (FA) à partir des IRM. Chez les patientes il existait : un déficit de switching, une association positive entre le score de switching sémantique et l'EC bilatérale dans le cortex préfrontal, pariétal, temporal et occipital et entre ce score et la FA des faisceaux fronto-occipital inférieur, longitudinal supérieur droits (p &lt;5% corrigé). Ces résultats suggèrent que le score de switching sémantique est associé à des bases cérébrales renforçant son utilisation potentielle comme biomarqueur.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">Background: The search of biomarkers in the field of depression requires easy implementable tests that are biologically rooted. Qualitative analysis of verbal fluency tests (VFT) are good candidates but its cerebral correlates are unknown. Methods: We collected qualitative semantic and phonemic VFT scores along with grey and white matter anatomical MRI of depressed (n=26) and healthy controls (HC, n=25) women. Qualitative VFT variables are the “clustering score” (i.e. the ability to produce words within subcategories) and the “switching score” (i.e. the ability to switch between clusters). The clustering and switching scores were automatically calculated using a data-driven approach. Brain measures were cortical thickness (CT) and fractional anisotropy (FA). We tested for associations between CT, FA and qualitative VFT variables within each group. Results: Patients had reduced switching VFT scores compared to HC. Thicker cortex was associated with better switching score in semantic VFT bilaterally in the frontal (superior, rostral middle and inferior gyri), parietal (inferior parietal lobule including the supramarginal gyri), temporal (transverse and fusiform gyri) and occipital (lingual gyri) lobes in the depressed group. Positive association between FA and the switching score in semantic VFT was retrieved in depressed patients within the corpus callosum, right inferior fronto-occipital fasciculus, right superior longitudinal fasciculus extending to the anterior thalamic radiation (all p&lt;0.05, corrected). Conclusion: Together, these results suggest that automatic qualitative VFT scores are associated with brain anatomy and reinforce its potential use as a surrogate for depression cerebral bases.</dcterms:abstract>
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