"2120","Perception and reconstruction of two-dimensional, simulated ego-motion trajectories from optic flow.","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.","http://cogprints.org/2120/","Bertin, R.J.V. and Israël, I. and Lappe, M.","UNSPECIFIED","       <span class=\"person_name\">Bertin, R.J.V.</span> and <span class=\"person_name\">Israël, I.</span> and <span class=\"person_name\">Lappe, M.</span>     (2000)  <a href=\"http://cogprints.org/2120/\"><em>Perception and reconstruction of two-dimensional, simulated ego-motion trajectories from optic flow.</em></a>       [Journal (Paginated)]           ","","2000"