Reconstructing passively travelled manoeuvres: Visuo-vestibular interactions.

Bertin, R.J.V. and Berthoz, A. (2001) Reconstructing passively travelled manoeuvres: Visuo-vestibular interactions. [Preprint]



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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 other conditions. Part of the illusionary reconstructed trajectories could be explained if we assume that the subjects based their reconstruction on the ego-motion percept obtained during the stimulus' initial moments. In the current paper, we test this hypothesis using a novel paradigm. If indeed the final reconstruction is governed by the initial percept, then additional, extra-retinal information that modifies the initial percept should predictably alter the final reconstruction. We supplied extra-retinal stimuli tuned to supplement the information that was underrepresented 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 it could also lead to less veridical reconstructions in other conditions.

Item Type:Preprint
Keywords:navigation, orientation, optic flow, visuo-vestibular interaction, virtual reality
Subjects:Neuroscience > Behavioral Neuroscience
Neuroscience > Neuropsychology
Psychology > Psychophysics
ID Code:2122
Deposited By:Bertin, Dr R.J.V.
Deposited On:08 Mar 2002
Last Modified:11 Mar 2011 08:54

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