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Apprentissage spatial et planification de l'action dans un modèle de réseau neuronal inspiré du cortex préfrontal

Abstract : The interplay between hippocampus and prefrontal cortex (PFC) is fundamental to spatial cognition. Complementing hippocampal place coding, prefrontal representations provide more abstract and hierarchically organized memories suitable for decision making. We model a prefrontal network mediating distributed information processing for spatial learning and action planning. Specific connectivity and synaptic adaptation principles shape the recurrent dynamics of the network arranged in cortical minicolumns. We show how the PFC columnar organization is suitable for learning sparse topological-metrical representations from redundant hippocampal inputs. The recurrent nature of the network supports multilevel spatial processing, allowing structural features of the environment to be encoded. An activation-diffusion mechanism spreads the neural activity through the column population leading to trajectory planning. The model provides a functional framework for interpreting the activity of PFC neurons recorded during navigation tasks. We illustrate the link from single unit activity to behavioral responses. The results suggest plausible neural mechanisms subserving the cognitive "insight" capability originally attributed to rodents by Tolman & Honzik. Our time course analysis of neural responses shows how the interaction between hippocampus and PFC can yield the encoding of manifold information pertinent to spatial planning, including prospective coding and distance-to-goal correlates.
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Submitted on : Wednesday, November 30, 2011 - 4:18:17 PM
Last modification on : Tuesday, December 8, 2020 - 3:34:51 AM
Long-term archiving on: : Friday, November 16, 2012 - 12:30:52 PM


  • HAL Id : tel-00646738, version 1


Louis-Emmanuel Martinet. Apprentissage spatial et planification de l'action dans un modèle de réseau neuronal inspiré du cortex préfrontal. Automatique / Robotique. Université Pierre et Marie Curie - Paris VI, 2010. Français. ⟨tel-00646738⟩



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