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Theses

Direction gravitaire visuelle: rôle de la perception d'orientation corporelle

Abstract : The purpose of this doctoral dissertation was to study the contribution of the perception of body orientation to the judgment of gravity direction when the body is roll tilted (Aubert-Müller effects). The physiological hypothesis, which explains the Aubert-effect by an underestimation of body orientation was evaluated. Data from a first set of experiments showed that the somaesthetic system was differently involved in the perception of verticality. Interceptive information should directly act in the perception of the direction of gravity whereas tactile information implied in the perception of body orientation would refer to the direction of gravity. Data from a second set of experiments did not confirm the physiological hypothesis. Results suggested that (1) subjects calculate angles in the both body/gavity and body/object spaces to judge the verticality and (2) errors in the perceived angles contribute to the errors in the perception of the direction of gravity. It appeared that the two spaces were biased in the same direction for a subject. A last experiment revealed that a bias in the perception of the orientation of the egocentric axis in the direction of the body tilt could contribute to the Aubert effect by acting in the perception of the two body/gravity and body/object spaces. A contribution of tactile information should account for the misperception of the egocentric reference.
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https://tel.archives-ouvertes.fr/tel-00011552
Contributor : Marion Trousselard <>
Submitted on : Tuesday, February 7, 2006 - 11:45:07 AM
Last modification on : Monday, October 19, 2020 - 11:04:41 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 4:42:42 PM

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  • HAL Id : tel-00011552, version 1

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Marion Trousselard. Direction gravitaire visuelle: rôle de la perception d'orientation corporelle. Neurosciences [q-bio.NC]. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00011552⟩

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