Two studies examined the positivity bias in children of different ages. Findings indicated that children from grade two and up selected the correct cause(s) when the effect covaried with only one cause, but only at a later age when covariation with two causes was presented. Ability estimations and expectation of success were more positive in…

Investigated parenting behavior, parent/adolescent relationship, and adolescent attitudes and behaviors in three family types. Results showed minimal support for the hypothesis that welfare is negatively related to family processes and adolescent attitudes and behavior, although mothers receiving welfare reported fewer effective parent-management…

Examined factors associated with young children's aggression. Observed 104 toddlers during free play with same-sex peer, with both mothers present. Found that early out-of-home care was not related to aggression. Boys were more aggressive than girls. Observed aggression and mother-reported externalizing problems were associated significantly with…

Assessed response-decision processes of relationally and overtly aggressive children. Found that overtly aggressive children evaluated overtly aggressive responses to instrumental conflict in relatively positive ways. Overtly aggressive girls, but not boys, evaluated overtly aggressive responses to relational conflict in relatively positive ways.…

Examined patterns of differential parental treatment, child outcomes, and family functioning with 60 families with toddler and preschool siblings. Found that congruence in mothers' and fathers' reports of differential treatment was most frequent. Reports of differential enjoyment were related to differential favoritism, whereas reports of…

Examined parental correlates of child attachment in preschool-aged, economically disadvantaged, urban, African-American sample. Found that 61% were securely attached, with girls more likely to be securely attached than boys. Parents of securely attached children were rated as more warm and accepting, less controlling, and less likely to use…

Examined parent/peer linkages and how both types of experiences influence substance use in European-American adolescents. Found that mothers' responsiveness lessened adolescents' peer orientation, which reduced substance use. This process was moderated by maternal values regarding adolescent alcohol use. Among fathers, closer monitoring was…

Considers the nature and developmental functions of physical activity play. Distinguishes three kinds of physical activity play with consecutive age peaks: rhythmic stereotypies, exercise play, and rough-and-tumble play. Considers gender differences and function in terms of immediate and deferred consequences in physical, cognitive, and social…

Maintains that the "getting into shape" hypothesis of explaining the inverted-U distribution of exercise play across age is likely incorrect. Argues that the biological study of human physical activity play, as recommended by Pellegrini and Smith (1998), will reveal whether physical activity play represents an example of performance-dependent…

Play has been difficult to define because it is an aspect of many activities rather than of just a specific kind of activity. Classic theorists such as Piaget and Vygotsky emphasized representational play as play in its purist form, but both immediate and ultimate functions of play can be discerned in simple physical activity play. (Author)

Proposes that humans may have evolved a special sensitivity to certain types of social information during rough-and-tumble play that facilitates social cognition. Describes the cognitive benefits of physical play as providing a break from demanding intellectual tasks and hypothesizes that physical play is related to gender differences in spatial…

Suggests that studies of the development of children with disorders of motor function afford opportunities, as yet unexploited, to understand the importance of motor function to overall child development. Maintains that Pellegrini and Smith's (1998) review provides a challenge to developmentalists from many disciplines to use their natural model…

Considers areas of consensus from commentaries, including the value of an evolutionary perspective and the utility of exploring variations in physical activity play. Examines areas of debate, including the nonplay-play distinction, functions of rough-and-tumble play, and the opportunities of juveniles for exercise training. Calls for more directed…

Studied head-orientation response of breast-feeding neonates in paired-choice odor tests. Found that 2-day olds detected amniotic fluid and colostrum, treating them as similar sensorily and/or hedonically. Four-day olds exhibited a preference for breast milk. Three-day olds oriented longer toward the odor of their own amniotic fluid than alien…

Explored relation between temperament and cardiac vagal tone in 12-week olds. Found that infants with higher baseline vagal tone showed fewer negative behaviors in the laboratory and were less disrupted by experimental procedures than infants with lower baselines. Infants who decreased cardiac vagal tone during assessments were rated by mothers as…