Three experiments were performed to investigate the effects of distribution of practice upon performance in motor learning.
Tasks and methods were the substitution task, by time limited method (Exp. I), and that, by work limited method (Exp. II), and the inverted alphabet copying, by work limited method (Exp. III).
A total of 180 junior school students of both sexes, served as Ss. In Exp. I and II, each three groups of Ss practised for 20 trials with intertrial rest intervals of either 0-, 10-, or 30-sec. and all Ss received a 10 min. rest followed by five additional practices by massed practice. In Exp. III, four groups of Ss practised for 30 trials, with intertrial rest intervals of either 0-, 5-, 15-, or 30-sec. and all Ss received a 10 min. rest followed by one additional practice.
The results may be summarized as follows:
1. In prerest practice, the distributed practice was superior to the massed practice and the level and rate of learning increase as a negatively accelerated function of degree of distribution of practice, under the conditions of either time limited or of work limited method.
2. Reminiscence (relative reminiscence) was found significantly by the group under the condition of highly massed practice and decreases as the intertrial rest interval increases.
3. In postrest practice, the performance of DP-30 group with the maximum degree of distribution in this experiment, was superior to that of MPgroup, by using time limthod, but not, by using work limited method in prerest practice.
This result seems to show that the difference between these two groups depends on the level attained, resulting from the difference of responses during prerest practice, and not on the permanent work decrement
SI
K.
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