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Perception visuelle de l'espace égocentré: Contribution différenciée des informations sensorielles à la localisation et l'orientation du plan médian corporel

Abstract : The purpose of this doctoral dissertation is twofold: (1) to contribute to a better comprehension of the processes implied in the egocentric perception of a visual object in gravitational earth space, and (2) to study the role of the egocentric reference in the visual
perception of the direction of gravity. Data from a first set of experiments showed that only roll body tilts induced errors in the visual localization and orientation of body midline. However, the deviation was in the direction opposite to body tilt for the localization task suggesting the implication of the vestibulo-ocular reflex, whereas the deviation was in the direction of body tilt for of the orientation task suggesting the implication of the tactile somaesthetic. The second set of experiments suggested that, when the head and trunk were dissociated, the cephalic segment play an important role in the egocentric perception of the orientation of the trunk by exerting an attraction in its direction in situation of sensory discordance (vibration of neck muscles and microgravity). However, these deviations seemed independent of the efficiency of cervical information. A last experiment revealed that the deviation in the perception of the orientation of the egocentric axis in the direction of the body tilt could contribute to the Aubert effect. The perception of Z-axis would have consequences not only on the perception of egocentric space but also on the judgement of the gravitational vertical. These results give to subjective body midline a heuristic value in the space orientation.
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Contributor : Hadrien Ceyte <>
Submitted on : Tuesday, December 19, 2006 - 10:48:40 AM
Last modification on : Friday, November 13, 2020 - 4:00:08 PM
Long-term archiving on: : Friday, November 25, 2016 - 2:04:10 PM

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Hadrien Ceyte. Perception visuelle de l'espace égocentré: Contribution différenciée des informations sensorielles à la localisation et l'orientation du plan médian corporel. Neurosciences [q-bio.NC]. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00121009⟩

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