Effect of shift in distribution of practice conditions following interpolated rest.

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Abstract
Certain implications of Hull''s inhibition concepts IR and SIR for motor learning were investigated. All groups were given 40 15-sec. trials with 5-sec. intertrial rest periods for massed practice and 45-sec. rest periods for distributed practice. A control group received distributed training throughout. Four exptl. groups had either 5,10, 15, or 20 trials of massed practice, a 10-min. rest, and the balance of the trials under distributed practice. Results were as follows: 1. Each exptl. group displayed a significant gain over rest. These gains tended to increase and then decrease as a function of amount of prerest massed practice. 2. Performance of the exptl. groups in the postrest trials failed to stabilize at a level below that of the control group. Following rest, all exptl. groups readily shifted to the level of the control group. The data were interpreted to imply that massing of practice does not lead to the development of any permanent decremental states. Distr. of practice is regarded as a performance rather than learning variable.
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