The knowledge of results-delay interval, the post-knowledge of results-delay interval, and intertrial interval were simultaneously manipulated during the performance of a rapid linear movement. 40 subjects completed 36 trials under one of four conditions, which differed minimally or maximally on each of the three time intervals. The median number of trials to reach a predetermined criterion of learning and the absolute error for movement time indicated that superior performance was inversely related to the duration of knowledge of results-delay interval. Neither the duration of the post-knowledge of results-delay nor the intertrial interval was critical to improving performance.
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