Title
ASYMMETRICAL SPATIAL ACCURACY IN 3D TRACKING
Published in
PROCEEDINGS of the HUMAN FACTORS AND ERGONOMICS
SOCIETY 38th ANNUAL MEETING
Nashville, Tennessee, October 24-28, 1994
Author
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.
Full copy in postscript