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Misalignment effect function measurement for oblique rotation axes: counterintuitive predictions and theoretical extensions (2013)
The Misalignment Effect Function (MEF) describes the decrement in manual performance associated with a rotation between a person's visual display frame of reference and that of their manual control. It now has been empirically deter- mined for rotation axes oblique to canonical body axes and is compared with the MEF previously measured for rotations about canonical axes. A targeting rule based on these earlier measurements is derived from a hypothetical process and shown to describe some of the data from three previous experiments. We call it the Secant Rule. It appears to explain the motion trajectories determined for rotations less than 65 degrees purely in kinematic terms without a need to appeal to a process of mental rotation. Further analysis of this rule in three dimensions applied to oblique rotation axes leads to a somewhat surprising expectation that the difficulty posed by rotational misalignment should get harder as the required movement is shorter. This prediction is confirmed. Geometry underlying this rule also suggests analytic extensions for predicting more generally the difficulty of making movements in arbitrary directions subject to arbitrary misalignments.
axes, counterintuitive, effect, extensions, function, measurement, Misalignment, oblique, predictions, rotation, theoretical
Proceedings of the 2013 International Annual Meeting of the Human Factors and Ergonomics Society, 22-26 October 2013, San Diego, California
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