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<dc:title xml:lang="fr">Implication des neurones cortico-lombaires dans l'intégration sensorimotrice</dc:title>
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<dc:subject xml:lang="fr">Mouvement</dc:subject>
<dc:subject xml:lang="fr">Cortex moteur</dc:subject>
<dc:subject xml:lang="fr">Moelle épinière lombaire</dc:subject>
<dc:subject xml:lang="fr">Intégration sensorimotrice</dc:subject>
<dc:subject xml:lang="en">Movement</dc:subject>
<dc:subject xml:lang="en">Motor cortex</dc:subject>
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<dcterms:abstract xml:lang="fr">Le mouvement volontaire chez les animaux est régulé par le cortex sensorimoteur. Nos premiers travaux, dans le cadre d’un projet d’équipe, montrent que le tractus corticospinal (CST), reliant le cortex à la moelle lombaire, joue principalement un rôle dans la modulation des informations sensorielles, plus que sur la commande directe de la contraction musculaire. A la suite de ces travaux, notre projet principal avait pour objectif d’identifier dans quel contexte physiologique les neurones cortico-lombaires s’activent et si, et comment ils encodent certains paramètres du mouvement. Pour cela, nous avons combiné enregistrements électrophysiologiques, identification par optotagging et la capture du mouvement des pattes postérieures chez la souris pendant des tâches de motricité. Nous avons pu observer que les neurones du cortex sensorimoteur présentent une activité corrélée avec la phase de la marche, différemment s'ils sont cortico-lombaires ou non, et que cette activité est un excellent prédicteur des paramètres de la locomotion.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Voluntary movement in animals is regulated by the sensorimotor cortex. Our initial work, as part of a team project, showed that the corticospinal tract (CST), linking the cortex to the lumbar spinal cord, plays a role mainly in the modulation of sensory information, rather than in the direct control of muscle contraction. Following on from this work, the aim of our main project was to identify the physiological context in which cortico-lumbar neurons are activated, and whether and how they encode certain movement parameters. To achieve this, we combined electrophysiological recordings, optotagging identification and motion capture of the hindlimbs in mice during motor tasks. We were able to observe that neurons in the sensorimotor cortex show activity correlated with gait phase, in a different manner depending on whether they are cortico-lumbar or not, and that this activity is an excellent predictor of locomotion parameters.</dcterms:abstract>
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