Children can recognize patterns much earlier than they can reconstruct them. A child cannot understand seriation in an operational sense unless he recognizes a seriated configuration. (ST)

Empirically describes the relative development of perceptual and conceptual understanding of left-right, back-front, up-down projective relationships between objects and provides a heuristic model of the cognitive processes involved in coordination of perspectives tasks. (Author/ED)

Examines how children's responses to questions about object terms varied across objects and the degree to which children specified common and conventional values for different object dimensions. (HOD)

Study deals with a comparative developmental analysis of performances on the same task by four age groups. (MB)

Reports on a study in which children aged 7 to 9 years and 11 to 13 years were asked to judge which one out of three wooden blocks would float, given weight and volume information for each block relative to a block that was known to float. Indicates that judgments may have been based on the size-weight illusion. (HOD)

Examined perception of object unity in partial occlusion in 72 infants. Recorded how long subjects looked at a display of complete and incomplete rods. In test and control conditions, infants looked longer at broken rods than at complete rods, suggesting that infants' cognitive, visual, or attentional skills may be insufficient to support…