?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Perception+and+reconstruction+of+two-dimensional%2C+simulated+ego-motion+trajectories+from+optic+flow.&rft.creator=Bertin%2C+R.J.V.&rft.creator=Isra%C3%ABl%2C+I.&rft.creator=Lappe%2C+M.&rft.subject=Psychophysics&rft.description=A+veridical+percept+of+ego-motion+is+normally+derived+from+a+combination+of+visual%2C+vestibular%2C+and+proprioceptive+signals.+In+a+previous+study%2C%0Ablindfolded+subjects+could+accurately+perceive+passively+travelled+straight+or+curved+trajectories+provided+that+the+orientation+of+the+head%0Aremained+constant+along+the+trajectory.+When+they+were+turned+(whole-body%2C+head-fixed)+relative+to+the+trajectory%2C+errors+occurred.+We+ask+here%0Awhether+vision+allows+for+better+path+perception+in+similar+tasks%2C+to+correct+or+complement+vestibular+perception.+Seated%2C+stationary+subjects+wore%0Aa+head+mounted+display+showing+optic+flow+stimuli+which+simulated+linear+or+curvilinear+2D+trajectories+over+a+horizontal+ground+plane.+The%0Aobserver's+orientation+was+either+fixed+in+space%2C+fixed+relative+to+the+path%2C+or+changed+relative+to+both.+After+presentation%2C+subjects+reproduced+the%0Aperceived+movement+with+a+model+vehicle%2C+of+which+position+and+orientation+were+recorded.+They+tended+to+correctly+perceive+ego-rotation%0A(yaw)%2C+but+they+perceived+orientation+as+fixed+relative+to+trajectory+or+(unlike+in+the+vestibular+study)+to+space.+This+caused+trajectory%0Amisperception+when+body+rotation+was+wrongly+attributed+to+a+rotation+of+the+path.+Visual+perception+was+very+similar+to+vestibular+perception.&rft.date=2000&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F2120%2F2%2FVR-2000-40-21-P2951-RE.PDF&rft.identifier=++Bertin%2C+R.J.V.+and+Isra%C3%ABl%2C+I.+and+Lappe%2C+M.++(2000)+Perception+and+reconstruction+of+two-dimensional%2C+simulated+ego-motion+trajectories+from+optic+flow.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F2120%2F