Abstract
Researchers who employ the method of constant stimuli often run a large number of trials to assess a treatment effect. The result, generally, is two esti mates of error: (1) the within-trial error for a particular treatment (i.e., the difference magnitude between the criterion or goal and the subject's estimate of that goal), and (2) the between-trial deviations for a particular number of these difference magnitudes. Behaviorally, these estimates of performance error indicate measures of accuracy and consistency, respectively. In a typical motor learning study, for example, if a subject completes 30 trials in attempting to achieve some criterion-referenced goal, each performance error score (i.e., the performance score-the criterion goal) may be grouped into blocks of, perhaps, 5 trials each. For each of the six blocks, then, estimates of perfor mance accuracy and consistency may be assessed and subjected to statistical analyses. The traditional measure of performance accuracy over a block of trials has been
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