Two experiments to replicate P. E. Touchette's findings on the delayed prompt effect, with 34 subjects having mental retardation, found more variable results, with all five of the possible outcomes occurring with some subjects. The paper concludes that successful use of the delayed prompt technique depends on such factors as difficulty of target…

This overview reviews a program of interlinked cross-sectional and longitudinal investigations of the nature of cognitive development in infants and young children with Down's Syndrome. The research falls into three groupings: object concept studies, operant learning experiments, and IQ studies. Early results suggest a common learning style which…

The study investigated the relationship between topographically different child behaviors (compliance and inappropriate activities) in four mentally retarded subjects (aged 3-5) by using a methodology that tests for response covariation. Regardless of the intervention used, the behavior targeted, or the direction manipulated, the nontargeted…