We describe an integrated theory of individual differences that traces the behavioral development of life history from genes to brain to reproductive strategy. We provide evidence that a single common factor, the K-Factor, underpins a variety of life-history parameters, including an assortment of sexual, reproductive, parental, familial, and…

The Infant-Infant Contact Code, developed to observe the social behavior in infants, is described. Results from using this scale with nine infants under nine months indicated that contacts between infants are complex in nature, that there are developmental changes in models of encounter, and that babies take different roles in relation to the…

Examined relations between social-cognitive skills, aggression, and social competence using teacher questionnaire and tabletop tasks with preschool and kindergarten children. Found that generation of forceful solutions in a traditional social-problem solving task and performance on the false belief tasks were significantly related to social…

Four research papers discuss the influence of social cues on children's behavior. Specifically, the focus of this program of research was to systematically investigate the impact of two classes of social cues: (1) implicit or explicit instructional cues inherent in social interactions, and (2) inferred or actual evaluative cues present in…

Examines whether there are sex differences during middle childhood in children's choices to participate in activities differing in level of adult-provided structure; effects of structure on children's compliance, leadership, and recognition seeking directed to adults and to peers; and relation of sex-typed social skills or dispositions and…