Buyer L S, Berkson G, Winnega M A, Morton L
Am J Ment Defic. 1987 Mar;91(5):543-7.
Severely and profoundly mentally retarded children who engaged in stereotyped body rocking were presented with all possible pairs of three conditions and made a choice as to which they preferred: a rocking chair that rocked freely under the child's control (active stimulation), a rocking chair that provided the same stimulation but was under the experimenter's control (passive stimulation), and a rocking chair that had been immobilized (stationary). Children significantly chose the active stimulation condition over the passive and the passive over the stationary; however, the degree of the effect was associated with developmental level. Results were interpreted as showing that self-stimulation involves at least two independent processes, control and stimulation.
对那些有刻板身体摇晃行为的重度和极重度智力发育迟缓儿童，呈现出三种条件下所有可能的两两组合，并让他们选择自己更喜欢哪一种：一把在儿童控制下能自由摇晃的摇椅（主动刺激）、一把提供相同刺激但由实验者控制的摇椅（被动刺激），以及一把已固定不能摇晃的摇椅（静止状态）。儿童显著地选择主动刺激条件而非被动刺激条件，选择被动刺激条件而非静止状态；然而，这种效应的程度与发育水平相关。结果被解释为表明自我刺激至少涉及两个独立的过程，即控制和刺激。
