Interpersonal dynamics within friendships were observed in a sample of 120 (60 male, 60 female) ethnically diverse 16- and 17-year-old adolescents characterized as persistently antisocial, adolescent-onset, and normative. Dyadic mutuality and deviant talk were coded from videotaped friendship interactions. Persistently antisocial adolescents…

Investigates the ability of four-, seven-, and ten-month-old infants to perceive and base novelty responses on correlations among perceptual attributes in a category-like context. In a habituation-dishabituation paradigm, ten-month-old infants clearly responded on the basis of the correlation among attributes, while four- and seven-month-old…

Examines developmental change in 4- 7- and 10-month-old infants' perceptions of correlations among attributes to determine whether relational information plays a role in abilities ranging from the perception and recognition of a simple pattern to the formation of a category. (HOD)

In a schematic concept formation task, second and fifth graders were required to sort 60 computer-generated, 8-sided polygons into two classes. The results indicated that age differences in schematic concept formation are due more to the efficiency of information use than to differences in strategy or the selection of information to be used. (ST)