To test the theory that retardates are particularly slow in forming some visual habits, especially attention, a series of experiments were performed using a laboratory device which forced subjects to discriminate between color and form in exchange for an incentive reward. Stochastic models were applied to tests of lower level retardates which…

Three autistic boys (ages 9-13) were trained to select a card containing a stimulus array comprised of three visual cues. Decreased distance between cues resulted in responses to more cues, increased distance to fewer cues. Distances did not affect the responding of children matched for mental and chronological age. (Author/JW)

This study tested the hypothesis that the reported increase in children's use of prepositional phrases when exposed to novel (inverted) prepositional phrases could be eliminated by discrimination training in two prepositional forms. (Author/MS)