Visual search differs but not reaction time when intercepting a 3D versus 2D videoed opponent.Journal of Motor Behavior.Vol. 45, No. 2, 2013. Pages 107-115 Dio: 10.1080/00222895.2012.760512. ISSN: 0022-2895 (Print), 1940-1027 (Online) Marcus J.C. Leeab, Steve J. Tidmana, Brendan S. Laya, Paul D. Bourkec David G. Lloyda,d, Jacqueline A. Aldersona.
aSchool of Sport Science, Exercise and Health, The University of Western Australia.
Abstract This paper examined whether the reaction time and gaze behaviours of participants were different, when they sidestepped from a standing position to simulate an interception of 2D versus 3D projections of an oncoming opponent. To achieve this, a customised stereoscopic system was integrated with an opto-reflective motion analysis system and a gaze tracker, forming a novel Integrated Stereoscopic System (ISS). Component parts of the ISS were synchronised using a custom interface. Following synchronization, the ISS was used to record the 3D kinematics and gaze behaviours of 10 males, when they responded to the 2D and 3D opponents. Participants spent significantly less time (16%) fixating on the trunk and more time outside the body (23%) of the 3D opponent compared with the 2D stimulus. The time taken to intercept the opponent in the 2D and 3D conditions was not significantly different. Differences were found between the participants visual search behaviour, but not time to initiate a sidestep, when perceiving 3D compared with 2D stimuli. The additional depth cues provided by the 3D stimulus may have allowed participants to perform the interception task equally well across both conditions even though less time was spent fixating on the 3D opponent's body. Keywords2D and 3D visual stimuli, perceptual-motor skill, perception-action coupling, sidestep
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