When 1-min. practice trials alternate between two unrelated motor tasks so that total practice is continuous, each task interferes with the learning of the other (n = 28 males). Comparison with control group data (n = 28 males) for each task (practice on the other task being replaced with intertrial rests) shows that interference from the more complex and demanding of the two tasks occurs much earlier (compared with onset of interference from the other) and progresses through a period of cumulating effect which is followed by a period of relatively constant learning deficit.
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