Role of gravity-based information on the orientation and localization of the perceived body midline |
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Authors: | Hadrien Ceyte Corinne Cian Vincent Nougier Isabelle Olivier Marion Trousselard |
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Institution: | (1) Centre de Recherches du Service de Santé des Armées, BP 87, 38702 La Tronche cedex, France;(2) UPR-ES 597 ‘Sport et Performance Motrice’, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France |
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Abstract: | The present study focused on the influence of gravity-based information on the orientation and localization of the perceived
body midline. The orientation was investigated by the rolling adjustment of a rod on the subjects’ Z-axis and the localization by the horizontal adjustment of a visual dot as being straight ahead. Experiment 1 investigated
the effect of the dissociation between the Z-axis and the direction of gravity by placing subjects in roll tilt and supine postures. In roll tilt, the perception of the
body midline orientation was deviated in the direction of body tilt and the perception of its localization was deviated in
the opposite direction. In the supine body orientation, estimates of the Z-axis and straight-ahead remained veridical as when the body was upright. Experiment 2 highlighted the relative importance
of the otolithic and tactile information using diffuse pressure stimulation. The estimation of body midline orientation was
modified contrarily to the estimation of its localization. Thus, subjects had no absolute representation of their egocentric
space. The main hypothesis regarding the dissociation between the orientation and localization of the body midline may be
related to a difference in the integration of sensory information. It can be suggested that the horizontal component of the
vestibulo-ocular reflex (VOR) contributed to the perceived localization of the body midline, whereas its orientation was mainly
influenced by tactile information. |
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Keywords: | Body midline Orientation Localization Tactile cues Otolithic cues |
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