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Pitch body orientation influences the perception of self-motion direction induced by optic flow

Abstract : We studied the effect of static pitch body tilts on the perception of self-motion direction induced by a visual stimulus. Subjects were seated in front of a screen on which was projected a 3D cluster of moving dots visually simulating a forward motion of the observer with upward or downward directional biases (relative to a true earth horizontal direction). The subjects were tilted at various angles relative to gravity and were asked to estimate the direction of the perceived motion (nose-up, as during take-off or nose-down, as during landing). The data showed that body orientation proportionally affected the amount of error in the reported perceived direction (by 40% of body tilt magnitude in a range of +/- 20 degrees) and these errors were systematically recorded in the direction of body tilt. As a consequence, a same visual stimulus was differently interpreted depending on body orientation. While the subjects were required to perform the task in a geocentric reference frame (i.e., relative to a gravity-related direction), they were obviously influenced by egocentric references. These results suggest that the perception of self-motion is not elaborated within an exclusive reference frame (either egocentric or geocentric) but rather results from the combined influence of both. (C) 2010 Elsevier Ireland Ltd. All rights reserved.
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Contributor : Jean-Louis Vercher Connect in order to contact the contributor
Submitted on : Wednesday, May 2, 2018 - 11:04:04 AM
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Aurore Bourrelly, J. -L. Vercher, L. Bringoux. Pitch body orientation influences the perception of self-motion direction induced by optic flow. Neuroscience Letters, Elsevier, 2010, 482 (3), pp.193-197. ⟨10.1016/j.neulet.2010.07.028⟩. ⟨hal-01436028⟩



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