The effects of discrete nonlinear transformations of tracking error information on the accuracy and efficiency with which the human operator can perform a compensatory tracking task were studied. Nine groups of seven subjects each were given forty 1-min. trials under nine different informational display conditions. The nine informational conditions were obtained by combining three levels of informational quantization (3, 7, or 11 categories of information) with three types of overall relationships between the displayed error and the actual error (linear, nonlinear magnification, or nonlinear minification). Indices of tracking accuracy and tracking efficiency were obtained by integrating absolute values of the voltage analogs of the actual tracking error and of the control stick deflec¬tions, respectively.
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