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<dc:title xml:lang="fr">Rôle d'un circuit hippocampo-cortico-thalamique dans les processus de mémoire spatiale chez le rat</dc:title>
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<dc:subject xml:lang="fr">Noyaux reuniens et rhomboïde du thalamus</dc:subject>
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<dc:subject xml:lang="fr">Mémoire spatiale</dc:subject>
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<dc:subject xml:lang="en">Thalamus</dc:subject>
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<dc:subject xml:lang="en">Medial prefrontal cortex</dc:subject>
<dc:subject xml:lang="en">Spatial memory</dc:subject>
<dc:subject xml:lang="en">Flexibility</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse avait pour objectif d’étudier le rôle du circuit composé de l’hippocampe (Hip), du cortex préfrontal médian (mPFC) et des noyaux reuniens et rhomboïde (ReRh) du thalamus dans les processus cognitifs qui sous-tendent la mémoire spatiale chez le Rat. Nous avons montré que les noyaux ReRh pourraient être impliqués dans la consolidation systémique, mécanisme nécessaire à la persistance des souvenirs et nécessitant un dialogue hippocampo-cortical. Nous avons mis en évidence que l’activité neuronale du mPFC durant le rappel d’une mémoire ancienne dépend des noyaux ReRh, ainsi que l’implication de ces noyaux dans une tâche de mémoire spatiale (dépendante de l’Hip) nécessitant une flexibilité comportementale (impliquant le mPFC). Enfin, nous avons montré un rôle du mPFC dans le rappel d’une mémoire spatiale récente. Ces résultats mettent en évidence l’importance de ce circuit hippocampo-cortico-thalamique dans le traitement et la persistance des informations spatiales chez le Rat.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis aimed to investigate the role of a circuit encompassing the hippocampus (Hip), the medial prefrontal cortex (mPFC) and the reuniens and rhomboid nuclei (ReRh) of the thalamus in cognitive processes underlying spatial memory in rats. We first showed that ReRh nuclei may be involved in systemic consolidation, a mechanism necessary for memory persistence and requiring hippocampal-cortical interactions. We confirmed these findings in a second study showing that mPFC neuronal activity during recall of a remote spatial memory depends on ReRh thalamic nuclei. We also showed the involvement of the ReRh nuclei in a mnemonic task requiring the use of both spatial information (dependent on the Hip) and behavioral flexibility (involving the mPFC). Finally, we found a role of the mPFC in the recall of recent spatial memory. Taken together, these results highlight the importance of a hippocampo-cortico-thalamic circuit in the processing and persistence of spatial information in the Rat.</dcterms:abstract>
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