Visual guidance of intercepting a moving target on foot

Perception
Brett R Fajen, William H Warren

Abstract

How do people walk to a moving target, and what visual information do they use to do so? Under a pursuit strategy, one would head toward the target's current position, whereas under an interception strategy, one would lead the target, ideally by maintaining a constant target-heading angle (or constant bearing angle). Either strategy may be guided by the egocentric direction of the target, local optic flow from the target, or global optic flow from the background. In four experiments, participants walked through a virtual environment to reach a target moving at a constant velocity. Regardless of the initial conditions, they walked ahead of the target for most of a trial at a fairly constant speed, consistent with an interception strategy (experiment 1). This behavior can be explained by trying to maintain a constant target-heading angle while trying to walk a straight path, with transient steering dynamics. In contrast to previous results for stationary targets, manipulation of the local optic flow from the target (experiment 2) and the global optic flow of the background (experiments 3 and 4) failed to influence interception behavior. Relative motion between the target and the background did affect the path slightly, presumably...Continue Reading

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Citations

Feb 3, 2007·Experimental Brain Research·Brett R Fajen, William H Warren
Jul 20, 2007·Experimental Brain Research·Brett R Fajen
Aug 16, 2008·Experimental Brain Research·Julien BastinGilles Montagne
Apr 28, 2009·Experimental Brain Research·Gabriel Jacob DiazBrett R Fajen
Dec 2, 2009·Experimental Brain Research·Julien BastinGilles Montagne
Apr 13, 2010·Neuropsychology Review·Alice Cronin-Golomb
Nov 3, 2005·Journal of Experimental Psychology. Human Perception and Performance·Brett R Fajen
Feb 16, 2006·Journal of Experimental Psychology. Human Perception and Performance·Richard M Wilkie, John P Wann
Jul 19, 2006·Journal of Experimental Psychology. Human Perception and Performance·Julien BastinGilles Montagne
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