Generalization after intradimensional discrimination training in 2-year-old children

Two-year-old children received intradimensional discrimination training at initially distant points on a circle-ellipse continuum. This training often did not produce stimulus control by circle-ellipse differences smaller than the original training values. The lack of control did not reflect capacity limitations, however. Good control was established when the children were given further training at nearer points on the continuum. The data confirm results of earlier research on stimulus generalization, extending them to a developing human subject population.