---
abstract: |-
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.
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- family: Bertin
given: R.J.V.
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- family: Israël
given: I.
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- family: Lappe
given: M.
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date: 2000
date_type: published
datestamp: 2002-03-07
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keywords: 'path perception, ego-motion; optic flow; linear heading, circular heading, vision; vestibular.'
lastmod: 2011-03-11 08:54:54
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number: 21
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publication: Vision Research
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referencetext: |-
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status_changed: 2007-09-12 16:42:57
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title: 'Perception and reconstruction of two-dimensional, simulated ego-motion trajectories from optic flow.'
type: journalp
userid: 2821
volume: 40