title: Different strategies for using motion-in-depth information in catching.
abstract: Previous studies on ball catching have had the limitation that the catcher was restricted to lateral hand movements. The authors investigated catching behavior in the more natural situation in which hand movements were unconstrained. Movements of the hand were tracked as participants tried to "catch" an approaching ball simulated with changing size and/or changing disparity. Participants used 1 of 2 distinct interception strategies: (a) a "cutting-off" strategy where time to passage (TTP) information was used to guide movements of the hand in depth such that the ball was caught farther in front of the face when the ball was approaching more slowly and (b) a "waiting" strategy where the hand was moved along a frontoparallel plane that was constant across ball trajectories and speeds. Cue dissociation and selective adaptation manipulations demonstrated that the catcher's estimates of TTP and crossing distance were based on a combination of binocular and monocular information.
authors.affiliation: Department of Applied Psychology, Arizona State University, Building 140, 7001 East Williams Field Road, Mesa, AZ 85212, USA. robgray@asu.edu
authors.forename: Rob
authors.initials: R
authors.lastname: Gray
authors.forename: Randy
authors.initials: R
authors.lastname: Sieffert
mesh_terms: D001696:Biomechanical Phenomena; D003198:Computer Simulation; D003463:Cues; D003867:Depth Perception; D018737:Hand Strength; D006801:Humans; D008962:Models, Theoretical; D009039:Motion Perception; D009949:Orientation; D011597:Psychomotor Performance; D011601:Psychophysics; D013223:Statistics as Topic; D013998:Time Perception; D015357:Vision Disparity; D015348:Vision, Binocular