Controlling steering and judging heading: retinal flow, visual direction, and extraretinal information.
The contribution of retinal flow (RF), extraretinal (ER), and egocentric visual direction (VD) information in locomotor control was explored. First, the recovery of heading from RF was examined when ER information was manipulated; results confirmed that ER signals affect heading judgments. Then the task was translated to steering curved paths, and the availability and veracity of VD were manipulated with either degraded or systematically biased RF. Large steering errors resulted from selective manipulation of RF and VD, providing strong evidence for the combination of RF, ER, and VD. The relative weighting applied to RF and VD was estimated. A point-attractor model is proposed that combines redundant sources of information for robust locomotor control with flexible trajectory planning through active gaze.
Wilkie
Richard
R
Department of Psychology, University of Reading, Whiteknights, United Kingdom. r.m.wilkie@reading.ac.uk
Wann
John
J
D001334:Automobile Driving; D003198:Computer Simulation; D005133:Eye Movements / Q000502:physiology; D005403:Fixation, Ocular / Q000502:physiology; D019416:Head Movements / Q000502:physiology; D006801:Humans; D007600:Judgment; D007699:Kinesthesis / Q000502:physiology*; D008124:Locomotion / Q000502:physiology*; D008606:Mental Processes / Q000502:physiology; D008960:Models, Psychological; D009039:Motion Perception / Q000502:physiology*; D009068:Movement / Q000502:physiology; D009949:Orientation; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology*; D012160:Retina / Q000502:physiology; D013037:Spatial Behavior / Q000502:physiology*; D014584:User-Computer Interface; D014785:Vision, Ocular; D014794:Visual Fields; D016138:Walking