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Active Gaze, Visual Look-Ahead, and Locomotor Control Richard M. Wilkie

Summary: Active Gaze, Visual Look-Ahead, and Locomotor Control
Richard M. Wilkie
University of Leeds
John P. Wann
University of London
Robert S. Allison
University of York
The authors examined observers steering through a series of obstacles to determine the role of active gaze
in shaping locomotor trajectories. Participants sat on a bicycle trainer integrated with a large field-of-
view simulator and steered through a series of slalom gates. Steering behavior was determined by
examining the passing distance through gates and the smoothness of trajectory. Gaze monitoring revealed
which slalom targets were fixated and for how long. Participants tended to track the most immediate gate
until it was about 1.5 s away, at which point gaze switched to the next slalom gate. To probe this gaze
pattern, the authors then introduced a number of experimental conditions that placed spatial or temporal
constraints on where participants could look and when. These manipulations resulted in systematic
steering errors when observers were forced to use unnatural looking patterns, but errors were reduced
when peripheral monitoring of obstacles was allowed. A steering model based on active gaze sampling
is proposed, informed by the experimental conditions and consistent with observations in free-gaze
experiments and with recommendations from real-world high-speed steering.
Keywords: locomotion, steering, gaze, eye movements, active vision


Source: Allison, Robert - Department of Computer Science, York University (Toronto)


Collections: Computer Technologies and Information Sciences; Biology and Medicine