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     <dc:title xml:lang="en">The neural basis of egocentric spatial representation andneck muscle vibration effects on spatial cognition, inhealthy subjects and patients who had a right stroke</dc:title>
     <dcterms:alternative xml:lang="fr">Bases neurales de la représentation spatiale egocentrique et de l'effet de vibrations cervicales sur la cognition spatiale, chez les sujets sains et cérébrolésés droits</dcterms:alternative>
     <dc:subject xml:lang="fr">referentiel egocentré</dc:subject><dc:subject xml:lang="fr">accident vasculaire cerebral</dc:subject><dc:subject xml:lang="fr">équilibre</dc:subject><dc:subject xml:lang="fr">IRM fonctionnelle
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     <dc:subject xml:lang="en">egocentric referential frame</dc:subject><dc:subject xml:lang="en">stroke</dc:subject><dc:subject xml:lang="en">balance</dc:subject><dc:subject xml:lang="en">functional MRI
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="027308901">Perception spatiale</tef:elementdEntree>
					</tef:vedetteRameauNomCommun><tef:vedetteRameauNomCommun>
						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="027301834">Maladies cérébrovasculaires</tef:elementdEntree>
					</tef:vedetteRameauNomCommun><tef:vedetteRameauNomCommun>
						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="027611205">Équilibre (physiologie)</tef:elementdEntree>
					</tef:vedetteRameauNomCommun><tef:vedetteRameauNomCommun>
						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="028921011">Imagerie par résonance magnétique</tef:elementdEntree>
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     <dcterms:abstract xml:lang="fr">Les troubles de l’équilibre impactent le pronostic des patients après un AVC. Ces troubles sont au moins en partie liés à la perturbation de la cognition spatiale probablement en lien avec le référentiel égocentré, notamment chez les patients AVC droits. Nous avons donc étudié quelles zones cérébrales étaient activées en IRM fonctionnelle pendant deux tâches égocentrées. Dix-sept sujets sains ont réalisé une tâche de droit devant subjectif (SSA) et une tache de plan corporel longitudinal subjectif (SLB) en IRMf. Ces tâches activent des aires pariétales supérieures et inférieures et le cortex occipital latéral avec une prédominance droite. Les résultats préliminaires de 14 patients post AVC droit distinguent trois patterns de réorganisation d’activations : péri lésionnelles, contra lésionnelles et bilatérales. La question sousjacente est la prise en charge spécifique de ces troubles, car aucun traitement portant sur la composante cognitive de l’équilibre
n’est actuellement couramment utilisé. A la suite d’études préliminaires, les stimulations proprioceptives par vibrations cervicales (NMV) sont apparues comme un traitement prometteur. Nous avons étudié l’effet cumulatif de séances de NMV sur l’asymétrie posturale de 89 patients dans les 9 mois après un AVC droit. L’amélioration de la déviation mediolaterale immédiatement après la première séance de NMV ne s’est pas maintenue après les interventions. De plus, la combinaison avec l’adaptation prismatique n’a pas montré d’effet bénéfique. Les perspectives de recherche portent sur l’inclusion de patients plus précocement après l AVC en utilisant des marqueurs plus spécifiques de la cognition
spatiale : SSA et SLB.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">Balance disorders affect the prognosis of stroke, increasing the risk of falls and gait disorders. As they are partly related to spatial cognition disorders, we studied the correlates of the egocentric referential frame. Using functional MRI, we analysed
17 healthy subjects' brain activations during the subjective straight-ahead task (SSA) and the subjective longitudinal body plan task (SLB). They activated superior and inferior parietal areas and the lateral occipital cortex with a right predominance. The same analysis was performed on 14 patients who had a right stroke. We distinguished three patterns of activation reorganisation: perilesional, contra-lesional and bilateral. The underlying question is the specific management of these spatial cognition disorders
after stroke. Despite the primary issue of managing balance disorders, no treatment addressing the cognitive component of balance is commonly used. Preliminary studies have shown that sensory stimulation by neck muscle vibration (NMV) is a promising treatment for postural disorders. We studied the cumulative effect of NMV sessions on postural asymmetry in 89 patients within nine months of a right stroke. However, the improvement in mediolateral deviation immediately after the first NMV session was not sustainable after the interventions on day 14. Furthermore, the combination with prismatic adaptation did not show any beneficial effect. Future research will focus on including patients earlier after stroke using specific markers of spatial cognition: SSA and SLB.</dcterms:abstract>
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       <tef:nom>Leplaideur</tef:nom>
       <tef:prenom>Stéphanie</tef:prenom>
       
       <tef:dateNaissance>1981-01-12</tef:dateNaissance>
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                        <dc:identifier xsi:type="tef:NNT">2022REN1B003</dc:identifier>
                        <dc:identifier xsi:type="tef:nationalThesisPID">http://www.theses.fr/2022REN1B003</dc:identifier>
                        <dcterms:dateAccepted xsi:type="dcterms:W3CDTF">2022-01-18</dcterms:dateAccepted>
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                            <tef:thesis.degree.discipline xml:lang="fr">Neurosciences, éthologie</tef:thesis.degree.discipline>
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