How adolescents perceive their relationships

In order to determine how adolescents perceive their relationships, a set of eight drawings representing one, two or three characters, whose sex and relationships where not clearly defined, were shown to 403 Parisian adolescents (227 girls and 176 boys) aged 15 to 19. The majority of data converge for all subjects, regardless of the sex, curriculum or socioeconomic factors. The subjects consistently identify more mixed-sex dyads and triads than same-sex in all pictures. This predominance does not imply that the adolescents perceived all relationships as having a romantic connotation. Some data seem consistent with the traditional sex role stereotypes. The subjects' responses do not seem to reflect the reality of their own peer relationships.     

A DAY AT DEVELOPMENTAL DOWNS: SPORTSCAST FOR RACE #2 - NEO-PIAGETIAN THEORIES OF COGNITIVE DEVELOPMENT

This article discusses the neo-Piagetian theories of cognitive development proposed by Robbie Case, Andreas Demetriou and Anastasia Efklides, Kurt Fischer, Jeffrey Farrar, Graeme Halford, Juan Pascual-Leone, Michael Shayer, and Robert Siegler. Each theory is discussed in terms of its basic assumptions, and propositions regarding structure, process, novelty and automatization, context, and mechanisms of development. Then some general conclusions are drawn about the enterprise of neo-Piagetian theorizing as a whole.     

Quantitative assessment of infant reaching movements

We have identified a fundamental property of human motor behavior as a tight coupling of the curvature-speed relationship in the reaching movements of 5- to 9-month-old infants. This relationship termed a movement unit, occurs regardless of the distance of duration of the reach and in spite of the developmental change that occurs in grasping during this period. Movement unit durations are tightly clustered around 200 ms regardless of overall duration or distance or the position of the unit in the reach. The curvature-speed coupling has been identified by others in adult reaching and handwriting. Models of biological motor control must account for this invariant relationship.