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

Neuroscience Letters
A BourrellyL Bringoux

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 r...Continue Reading

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Citations

Oct 12, 2011·Experimental Brain Research·C Scotto Di CesareD R Mestre
Nov 15, 2013·The Quarterly Journal of Experimental Psychology : QJEP·A BourrellyL Bringoux
Jul 30, 2021·Journal of Neurophysiology·Megan J KobelDaniel M Merfeld

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