Perception and reconstruction of two-dimensional, simulated ego-motion trajectories from optic flow.

Bertin, R.J.V. and Israël, I. and Lappe, M. (2000) Perception and reconstruction of two-dimensional, simulated ego-motion trajectories from optic flow. [Journal (Paginated)]

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A veridical percept of ego-motion is normally derived from a combination of visual, vestibular, and proprioceptive signals. In a previous study, blindfolded subjects could accurately perceive passively travelled straight or curved trajectories provided that the orientation of the head remained constant along the trajectory. When they were turned (whole-body, head-fixed) relative to the trajectory, errors occurred. We ask here whether vision allows for better path perception in similar tasks, to correct or complement vestibular perception. Seated, stationary subjects wore a head mounted display showing optic flow stimuli which simulated linear or curvilinear 2D trajectories over a horizontal ground plane. The observer's orientation was either fixed in space, fixed relative to the path, or changed relative to both. After presentation, subjects reproduced the perceived movement with a model vehicle, of which position and orientation were recorded. They tended to correctly perceive ego-rotation (yaw), but they perceived orientation as fixed relative to trajectory or (unlike in the vestibular study) to space. This caused trajectory misperception when body rotation was wrongly attributed to a rotation of the path. Visual perception was very similar to vestibular perception.

Item Type:Journal (Paginated)
Keywords:path perception, ego-motion; optic flow; linear heading, circular heading, vision; vestibular.
Subjects:Psychology > Psychophysics
ID Code:2120
Deposited By: Bertin, Dr R.J.V.
Deposited On:07 Mar 2002
Last Modified:11 Mar 2011 08:54

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