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<dc:title xml:lang="fr">Implication de l'hippocampe ventral et des noyaux reuniens et rhomboïde du thalamus dans les processus cognitifs sous-tendant la mémoire spatiale chez le Rat</dc:title>
<dcterms:alternative xml:lang="en">lnvolvement of the ventral hippocampus and reuniens and rhomboid thalamic nuclei in cognitive processes underlying spatial memory in rats</dcterms:alternative>
<dc:subject xml:lang="fr">Hippocampe ventral</dc:subject>
<dc:subject xml:lang="fr">Noyau reunien du thalamus</dc:subject>
<dc:subject xml:lang="fr">Mémoire spatiale</dc:subject>
<dc:subject xml:lang="fr">Rat</dc:subject>
<dc:subject xml:lang="fr">Lésion excitotoxique</dc:subject>
<dc:subject xml:lang="fr">Lidocaïne</dc:subject>
<dc:subject xml:lang="fr">Piscine de Morris</dc:subject>
<dc:subject xml:lang="fr">Inactivation</dc:subject>
<dc:subject xml:lang="en">Ventral hippocampus</dc:subject>
<dc:subject xml:lang="en">Reuniens and rhomboid thalamic nuclei</dc:subject>
<dc:subject xml:lang="en">Spatial memory</dc:subject>
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<dcterms:abstract xml:lang="fr">Ce travail de thèse avait pour objectif d’étudier le rôle de l’hippocampe (HPC) ventral et des noyaux reuniens (Re) et rhomboïde (Rh) du thalamus dans les processus cognitifs qui sous-tendent la mémoire spatiale chez le Rat. Par l’utilisation d’approches complémentaires combinant l’imagerie cérébrale, la lésion excitotoxique, l’inactivation fonctionnelle réversible et des évaluations comportementales, nos résultats ont mis en évidence : (1) l’implication spécifique de l’HPC ventral uniquement dans le rappel d’informations spatiales ; (2) un rôle-clé des noyaux Re et Rh dans la persistance d’un souvenir spatial ; (3) l’implication des noyaux Re et Rh dans le labyrinthe du double-H, un nouveau test nécessitant d’une part, l’utilisation d’informations spatiales dépendant de l’intégrité de l’HPC dorsal, et d’autre part, une flexibilité comportementale, impliquant le cortex préfrontal médian. Ainsi, l’ensemble de ces résultats permet de proposer l’existence d’un circuit HPC-préfronto-thalamique impliqué dans divers aspects du traitement des informations spatiales.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The main objective of this thesis was to investigate the role of the ventral hippocampus (HPC) and the reuniens (Re) and rhomboid (Rh) thalamic nuclei in the cognitive processes underlying spatial memory in the Rat. If our results first confirmed, in the Morris water maze, the role of the dorsal HPC in the acquisition and retrieval of a spatial reference memory, we demonstrated the specific involvement of the ventral HPC only in the recall of spatial information. In addition, by using complementary approaches combining brain imaging, excitotoxic lesion and reversible functional inactivation, we were able to show for the first time a key role for the Re and Rh in the persistence of a spatial memory (25 days). Finally, the third set of experiments has highlighted the involvement of the Re and Rh in a mnemonic task performed in a new test, the double-H maze, which requires the use of spatial information depending on the integrity of the dorsal HPC, and a behavioral flexibility, involving the medial prefrontal cortex. Thus, taken together, these results suggest the involvement of a HPC-prefronto-thalamic network in various aspects of spatial information processing.</dcterms:abstract>
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