This study examined the effects of providing training in identity, reversibility, and compensation explanations, alone and in every combination, for eight matched groups of 48 mildly retarded, nonconserving children. (Author/JMB)

A shortened version of a learning-set training procedure was given to 80 children four and five years of age. These children and 16 untrained controls were then tested for quantity conservation. Results relate task performance on the conservation tasks to the type of training received. (Author/JMB)

Sixty kindergarten, first-grade, and second-grade children were required to construct numerically equivalent collections and to determine asymmetric-transitive relations among nonequivalent collections, using two strategies of cardinal number: correspondence and counting. A novel "collinear correspondence" task was also introduced and compared…

The present studies were designed to test the role of descrepancy between existing cognitive structures and current input and the amount of pleasure derived from successful processing of that input with respect to children's appreciation of humor. (Author/SB)

A total of 72 schooled and 67 unschooled Tanzanian 8-14 year-olds from the Meru tribe were interviewed individually to determine their degree of mastery of conservation. Methodological defects in the application of Piaget's clinical method in cross-cultural studies were corrected. (SB)

Kindergarten through fourth graders (N=170) were tested for conservation and then interviewed following the presentation of a story about an elderly woman's death, in an attempt to assess children's understanding of 3 concepts: irrevocability, cessation of bodily processes, and universality. (Author/JMB)

Perceptual counterparts of a series of conservation of length tests were presented to subjects who were categorized as conservers or nonconservers conservation of length pre-tests, and to conservers and nonconservers given conservation length training. Perceptual performance of the untrained nonconservers was significantly worse than that of the…

Examined the development of stable concepts of "boy" and "girl" in kindergarteners and first and second graders. Gender constance was explored in relation to: performance on conservation tasks; application of gender label to self or other; application of gender label to live person or pictorial representations; and sex role…

This study examined the effects of 3 situational contexts varying in demands for accuracy and speed on the performance of 45 kindergarteners and 45 second grade students on the Matching Familiar Figures test of cognitive style. (JMB)

A combination of readiness and body-part training was the most effective in producing number conservation with external objects. (Authors)

First, second, third, sixth, and ninth graders and college students were presented with 4 different tasks of surface-volume dissociation in order to see whether or not the conservation of one of these properties would wrongly induce a belief in the conservation of the other. (Author/JMB)

Implications of this study on child-development theory, education, and psychotherapy are discussed. (MB)