Results of a study of 38 preschool children observed and videotaped during performance on a jigsaw-puzzle task indicate that puzzle solutions accompanied by a high rate of verbalizations were judged as more proficient, solved with a high rate of puzzle-solving moves, and completed in a shorter period of time. (Author/RH)

Three types of concepts were examined: concepts defined by sufficient features, concepts which possessed necessary and sufficient features, and concepts composed of exemplars with distinctive features. Second- and fifth-grade subjects learned the concepts in a procedure encouraging abstraction of common features or a procedure fostering exemplar…

A pre- to post-test design was used to evaluate the effects of rule-based instruction on rule observance, copying performance, and discrimination skill. Three ways of imparting rules (demonstration, verbal description, and combined demonstration-verbal description) were examined, and their usefulness was compared to that of copying without…

Two studies indicate that Oksapmin children progress from premediational to mediational phases in their use of body parts to compare and reproduce number and that this change generally occurs prior to the development of concepts of number conservation. A third study shows that this general change is manifested in culturally specific ways.…

A set of covariation problems was structured so that the solution pattern across problems would indicate the judgment rule used by each subject. A developmental trend across subjects in fourth, seventh, and tenth grades and in college demonstrated rule shifts toward use of increasingly accurate rules. (Author/RH)

In a replication study, children 3 and 4 years old were given verbal rule training in order to probe the importance of identity, reversibility, and compensation explanations in training number and length concepts. Among the results, as before, identity was found to be the most significant factor in conservation acquisition. (Author/RH)

Preoperational and concrete-operational first and second graders performed on a training task and a generalization task prior to and after serving in one of five instructional groups. The instructional groups were: no-training control, specific self-instruction, specific didactic control, general self-instruction and general didactic control.…

Children's performances in pointing a telescope at landmarks surrounding their own neighborhood were assessed for 60 children in three age groups: first and second graders, fourth and fifth graders, and seventh and eighth graders. Among the results, sex differences both in point consistency and in the accuracy of pointings from imagined reference…

Addresses questions about infant perceptual ability and the possibility of its decline as a function of development in the absence of specific experience. Compares English-speaking adults, Hindi-speaking adults, and 7-month-old infants on their ability to discriminate two pairs of natural Hindi (non-English) speech contrasts. (Author/RH)

Geometric matrix problems were presented to 11- and 14-year-olds and adults to investigate latency to solution as a function of number of elements (1-3) and of transformations (0-2) that had to be considered for correct solution. At all ages latencies increased as the number of elements and number of transformations increased. (Author/DB)

Third- and fifth-grade children were presented with a picture-naming interference task to examine the effects of printing words in mixed typecase on children's automatic word processing. (Author/MP)

Investigates the degree to which object familiarity and motivational factors influence infants' search behavior in an object-permanence test. (Author/MP)

Preschool children were asked to choose the figure most resembling a real man from three figures drawn according to formulas used by children to depict humans. Results suggest development of drawing systems influences children's conceptions about objects or events. (Author/DB)