Abstract
This paper reports on asymmetrical spatial accuracy of human subjects in tracking of an object which moves randomly with 6 degrees-of-freedom (DOF) in a 3D environment. It was found that, for translational errors, RMS deviations in the depth (Z) direction were 40% higher than those in the horizontal (X) direction, for an experimental display which provided binocular disparity (stereopsis), perspective and partial occlusion cues. In general, translational tracking errors in the vertical (Y) direction were greater than those in the X direction and smaller than those in the Z direction. In early stages of practice, vertical errors were similar to those in the Z direction, but as learning progressed, errors in the X and Y dimensions converged. These finding were consistent across two types of controllers and different tracking paths in the 3D environment. It would appear that horizontal movement requires higher attentional resource priority over vertical movement in such a tracking task.
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