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Theses

Intégration multisensorielle et motrice chez le primate non humain : approches anatomique, comportementale et électrophysiologique

Abstract : In order to interact with the multimodal world which surrounds us, we must integrate simultaneously
various sources of sensory information (vision, hearing, body sensation...). A fundamental question is thus
to know how the brain integrates the separate elements of an object defined by several sensory components
to form a unified percept. The superior colliculus was the main model to study the polymodal integration.
At the cortical level, until recently, polymodal integration appeared to be a characteristic that only had the
associative areas located at the top of the information processing hierarchy. First of all, our first study
related to cortico-cortical connections and showed the existence of direct projections between cortical areas
of different sensorialities in the non human primate. Then, the study of projections between different
sensory and motor cortical areas and the thalamus enabled us to highlight the existence of thalamic nuclei
which, by their connections, could represent an alternative pathway for the information transfer of different
sensory and/or motor cortical areas. The thalamus could allow a faster transfer and even an integration of
information. In addition, at the behavioral level, multisensory integration allows an improvement of
perception. An experiment conducted in macaques monkeys in a detection task of unimodal and bimodal
stimuli showed the presence of a significant multisensory gain which is highest at threshold level, which
decreases for increasing intensities above threshold and which disappears at high intensities. Lastly, in
these animals showing this multisensory gain on the behavorial side, we explored the mechanisms
underlying multisensory integration at the neuronal level in the auditory cortex. Thus, using anatomical,
behavioral and electrophysiological approaches, our results provide fundamental elements on the cerebral
structures implied in multisensory integration, their connections and the mechanisms existing in the brain to
treat in an effective way different sensory information, in order to initiate a motor response.
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https://tel.archives-ouvertes.fr/tel-00170144
Contributor : Catherine Marlot <>
Submitted on : Thursday, September 6, 2007 - 2:36:32 PM
Last modification on : Monday, November 30, 2020 - 4:50:02 PM
Long-term archiving on: : Thursday, April 8, 2010 - 9:43:20 PM

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  • HAL Id : tel-00170144, version 1

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C. Cappe. Intégration multisensorielle et motrice chez le primate non humain : approches anatomique, comportementale et électrophysiologique. Neurosciences [q-bio.NC]. Université Paul Sabatier - Toulouse III; Université de Fribourg, 2007. Français. ⟨tel-00170144⟩

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