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Les mécanismes neurocognitifs de l’inscription corporelle dans les jugements de latéralité

Abstract : The aim of this thesis was to study the neurocognitive mechanisms implicated in the determination of objects intrinsic handedness. In a first study, we evidenced that distinguishing the left from the right of an object requires a mental projection of the body schema onto the stimulus. This embodiment process occured for human and non human stimuli as well, suggesting that the mere presence of intrinsic axes on stimulus enables the bodily projection. In a second study, we explored the neural mechanisms underlying embodiment in a handedness shape matching task, using human bodies and cubes assemblies as stimuli with different orientations. Magnetoencephalography (MEG) revealed that the left superior parietal lobe participated in the embodiment and spatial transformation of both stimuli. In addition, we observed a contribution of the supplementary motor area for cube assemblies specifically. Therefore, we consider the superior parietal lobe as the neural substrate of an emulator processing the body schema to encode handedness and to predict the visual consequences of a spatial transformation. Besides, the additional contribution of the supplementary motor area probably helped the spatial transformation of unfamiliar shapes by backpropagating a motor command to the emulator to increase cohesiveness of the mentally rotated object. These interpretations support the grounding of cognition in bodily actions.
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François Tariel. Les mécanismes neurocognitifs de l’inscription corporelle dans les jugements de latéralité. Psychologie. Université Paris Sud - Paris XI, 2011. Français. ⟨NNT : 2011PA113007⟩. ⟨tel-00657883⟩

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