Evaluates the efficacy of two training procedures for eliminating selective stimulus control observed with three trainable mentally retarded children. In another experiment, improvements in stimulus control were not a function of varying degrees of difficulty between stimulus sets or of a prior history of discrimination training with the less…

Varied conditions under which children aged four to five years matched the area of a rectangle with a given width or height to that of a square. Subjects matched one dimension of the rectangle to one side of the square suggesting that area matches seemed to be based on a side-matching strategy. (Author/AS)