Abstract

Quantifying the accurarcy and consistency of human motor performance has often involved calculating various error score measures of an individualïs performance across a block of trials. Traditionally, error score measures have bee used for task in which performance can vary in only one dimension. However, recent studies have used these error measures with more complex tasks, in which performance may deviate on the horizontal and vertical exes of a two-dimensional surface. This article examines the use of these one-dimensional task error measures for performance on two-dimensional tasks, with special attention to a recent article by Singer, Cauraugh, Murphey, Chen, and Lidor (1991). We show that using one-dimensional error scores to assess performance on a two-dimensional task may yield results that are arbitracy and thus difficult to interpret in a meaningful way.
Verf.-Referat