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 |
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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 |
Available Versions of this Item
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Reconstructing passively travelled manoeuvres:
Visuo-vestibular interactions. (deposited 08 Mar 2002)
- Visuo-vestibular interaction in the reconstruction of travelled trajectories. (deposited 19 Mar 2003) [Currently Displayed]
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