Carson L M, Wiegand R L
a School of Physical Education , West Virginia University.
J Mot Behav. 1979 Dec;11(4):247-51. doi: 10.1080/00222895.1979.10735193.
The variability-of-practice hypothesis, a major prediction of Schmidt's (1975) motor schema theory, was tested in an attempt to investigate motor-schema formation. In addition, schema retention was observed after a 2-week retention interval. The task involved preschool children in tossing a bean bag for appropriate distance. Four treatment groups received 100 practice trials equally divided over five days. Variation was provided by varying the weights of the bean bags. The testing situations involved tossing a criterion weighted bean bag as well as a novel weighted bean bag which none of the groups had experienced previously. In addition, all groups were tested on a new but similar task. The results supported the variability-of-practice hypothesis in terms of schema formation and transfer to novel tasks in the same movement class. After a two-week retention interval, loss in performance was significantly less for the group with variability of practice than all other groups.
实践变异性假说作为施密特（1975年）运动图式理论的一个主要预测，在一项旨在研究运动图式形成的实验中得到了验证。此外，在两周的保留期后观察了图式保留情况。该任务要求学龄前儿童将豆袋扔到合适的距离。四个治疗组在五天内平均进行了100次练习试验。通过改变豆袋的重量来提供变化。测试情况包括投掷一个标准重量的豆袋以及一个所有组之前都未经历过的新的重量的豆袋。此外，所有组都在一个新的但类似的任务上进行了测试。结果在图式形成以及向同一运动类别中的新任务迁移方面支持了实践变异性假说。在两周的保留期后，具有实践变异性的组的表现损失明显小于所有其他组。
