Disadvantaged preschool children, although less efficient in intellectual performance than advantaged children, were not less likely to inhibit motor responses upon verbal request or less curious. (MH)

Results indicate that (1) babies have better concept of person than object as permanent, but there are important individual differences, (2) rate of person permanence development is related to infant-mother attachment, and (3) rate of person permanence development affects object permanence development. (MH)

Questions concerning the effects of familiar and alien materials, age and culture, and the etiology of conservation are examined in number and continous quantity tasks assessing conservation in Yoruba children from traditional and educationally advantaged homes. (Author/AJ)

A modified anagram task is employed to explore the development of anticipatory imagery and its relationship to reading achievement, complexity of stimulus material, and practice effects. (Author/AJ)

Presents the procedures, results, and conclusions of a study designed to compare the cognitive performance of students from a new curricula (PSSC) and from traditional (non-PSSC) curricula. Results essentially supported contention that PSSC materials were more effective in developing higher cognitive skills. (DS)

Paper presented at the Merrill-Palmer Conference on Research and Teaching of Infant Development, February 13-15, 1970. (JE)

Traces the child's growing understanding of the recursive nature of thought through mastery of a sequence of four steps. Recursive thinking may well be a prerequisite for complex, role taking-type inferences found in adolescent thought. (WY)

Results indicated that the training method (discrimination) induced 8 of the 12 subjects to acquire conservation of a stable kind. (Author/DR)

Portions of this paper were presented at the meetings of the Society for Research in Child Development, Santa Monica, California, March 1969. (MH)