The developmental relations between anticipatory imagery, conservation of length, and operational structures were investigated in 80 kindergarten and third-grade children by means of imagery tasks combined with a length conservation task. (MS)

Attempted to determine (1) whether developmental differences existed in children's comprehension of simple necessity and simple sufficiency relationships, and (2) the source of developmental differences in children's causal reasoning. (SB)

Indicates that object relative (O) clauses are learned after subject relative (S) clauses. Shows that children did not reliably comprehend O-clauses until nine years of age, two years after S-clauses. Suggests the need to attain a level of operational thought before O-clauses can be understood. (RL)

Children's drawings of objects about to be moved in space (anticipatory images) were studied in relation to their judgments about Euclidian spatial relations. (SB)

The aim of this study was to document the development of illness and health causality concepts in young hospitalized children (ages 4-10 years) whose stage of cognitive development may limit understanding of illness and treatment. It was hypothesized that distinct qualitative levels would characterize children's conceptions of illness and that…

Analysis of primary process thinking of the same children at kindergarten level and at grade four revealed that amount of primary process thinking was relatively constant with development, contrary to predictions based on psychoanalytic theory. However, drive related ideation increased and formal deviations of thought decreased in quality and type…

A map-drawing task was used to test the effects of (1) presenting instruction at a cognitive level higher than that at which most of the students in the study were operating and of (2) presenting instruction to groups of students of differing cognitive levels. Subjects were 63 fifth grade students. (JMB)

Education and behavior science share many concerns and their expertise should be complementary. Practical implications of theories need to be derived and field tested. This article focuses on Piaget's stages of development and how Piagetian theory can be translated into educational language so that research useful to teachers can be initiated. (MT)

Developmental changes in memory organization based on synonym and antonym relationships were examined in three experiments. Subjects were 64 second graders and 64 sixth graders. Some inadequacies of a false recognition paradigm for developmental research are identified and some alternative analyses are proposed. (Author/JH)

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)

Explored the relationships between the cognitive developmental level of preoperational, concrete operational, and formal operational children (N=10) and their success in interpreting and explaining each of eight commonly described mechanisms of psychological defense. (JMB)

Discusses Piaget's pre-operational, concrete operational, and formal operational stages and shows how this information sheds light on how children approach computers and computing, particularly with the LOGO programming language. (JN)

Assesses three sets of Piagetian exclusion operations (of varying the independent variables, of holding the independent variable constant, and tautology) and of levels of thought (concrete through formal) in 33 fifth graders, 27 sixth graders, and 31 seventh graders. (HOD)

A total of 192 second- to sixth-grade children, showing three different levels of class-inclusion answers (failure, correct answer based on counting, correct answer based on logical reasons), performed four necessity tasks. Results are discussed with reference to individual and constructive generalization processes. (Author/RH)

Jean Piaget's theory of cognitive development described what children are capable of doing at each stage of development; new research focuses on actual use of these capabilities. (Author/MLF)