Investigated the hypothesis that preschoolers encode perceptual attributes, but not conceptual attributes, of objects in recall tasks. Children were asked to recall typical and atypical objects, or objects that varied in typicality and size. Children were influenced by both conceptual and perceptual stimulus characteristics. (LB)

Studied discriminative and investigatory response behavior and effects of response training on children 4-5 to 6-5 years of age. (DR)

Children with mental retardation are particularly prone to failure on relational tasks such as oddity and match-to-sample, suggesting a differential sensitivity to relational information. This paper reports on several studies in which characteristics of stimulus arrays were enhanced. Results demonstrated the theoretical and practical significance…