Hekkema N, Freedman P E
Am J Ment Defic. 1978 Sep;83(2):129-34.
Contingent reinforcement was used in training eight severely retarded children who were previously judged to be nonimitative. A yoked control group was given comparable training, but with noncontingent reinforcement. Posttests of imitation of new behavior of a reinforced model showed significant immediate and delayed (15 minutes) imitation only in the contingent-reinforcement group.
对八名先前被判定为无模仿能力的重度智障儿童进行训练时采用了偶然强化法。设置了一个匹配对照组，给予其类似的训练，但采用的是非偶然强化法。对强化模型新行为模仿的后测表明，只有偶然强化组出现了显著的即时模仿和延迟（15分钟）模仿。
