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Visuo-vestibular interaction in the reconstruction of travelled trajectories

Bertin, R.J.V. and Berthoz, A. (2002) Visuo-vestibular interaction in the reconstruction of travelled trajectories. [Preprint]

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Abstract

We recently published a study of the reconstruction of passively travelled trajectories from optic flow. Perception was prone to illusions in a number of conditions, and not always veridical in the others. Part of the illusionary reconstructed trajectories could be explained by assuming that subjects base their reconstruction on the ego-motion percept built during the stimulus' initial moments . In the current paper, we test this hypothesis using a novel paradigm: if the final reconstruction is governed by the initial percept, providing additional, extra-retinal information that modifies the initial percept should predictably alter the final reconstruction. The extra-retinal stimulus was tuned to supplement the information that was under-represented or ambiguous in the optic flow: the subjects were physically displaced or rotated at the onset of the visual stimulus. A highly asymmetric velocity profile (high acceleration, very low deceleration) was used. Subjects were required to guide an input device (in the form of a model vehicle; we measured position and orientation) along the perceived trajectory. We show for the first time that a vestibular stimulus of short duration can influence the perception of a much longer lasting visual stimulus. Perception of the ego-motion translation component in the visual stimulus was improved by a linear physical displacement: perception of the ego-motion rotation component by a physical rotation. This led to a more veridical reconstruction in some conditions, but to a less veridical reconstruction in other conditions.

Item Type:Preprint
Additional Information:revision resubmitted to Exp. Brain Res.
Keywords:navigation, orientation, optic flow, visuo-vestibular interaction, virtual reality
Subjects:Neuroscience > Neuropsychology
Psychology > Psychophysics
Neuroscience > Behavioral Neuroscience
ID Code:2831
Deposited By:Bertin, Dr R.J.V.
Deposited On:19 Mar 2003
Last Modified:11 Mar 2011 08:55

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