This study examined the power of nonshared environment to differentiate adolescent monozygotic twin development and the extent to which this power varied across social structural contexts. Findings indicated that differences in maternal closeness, teacher bonding, and religious participation differentiated twins on emotional distress. Family…

Latent growth models estimated developmental trajectories for adolescents' math and English self-perceptions (perceived talent, success expectancies), values (intrinsic, utility) and task perceptions (task difficulty, effort required). A longitudinal cohort-sequential study included 1,323 participants spanning Grades 7 to 11, with Occasion 1 mean…

Life history theorists have proposed that humans have evolved to be sensitive to specific features of early childhood environments and that exposure to different environments biases children toward development of different reproductive strategies, including differential pubertal timing. The current research provides a longitudinal test of this…

A simulated peer-counseling situation was used to assess decision making among 108 adolescents in grades 7 through 12. As grade level increased, adolescents significantly more often mentioned potential risks and future consequences of decisions; recognized and treated vested interests with caution; and suggested an independent professional opinion…

Tested the individual characteristics and deviant peer association theoretical models of friends' influence on the development of delinquency in disruptive boys. Found that moderately disruptive boys with aggressive-disturbing friends were more delinquent at age 13 than other subgroups of moderately disruptive boys. Highly disruptive and…

Examined individual differences in friendship characteristics and their cross-sectional and longitudinal interrelations with adolescent problems. Assessed four salient friendship characteristics: reciprocity of relations, overt hostility, covert hostility, and self-disclosure. Suggests that adolescent problem behaviors have a more potent…

Examined factor structure of the emotional Autonomy Scale (EAS) in 3 samples of adolescents, with each sample consisting of 3 racial/ethnic groups. Found that the EAS exhibited poor construct validity and behaved quite differently for different grade and ethnic groups. Suggested that the most credible solution may be to reexamine the conceptual…

Examined precursors and correlates of sexual intercourse patterns among 10th- and 11th-graders. The transition to onset of sexual intercourse was associated with increases in delinquency and slower increases in school grades. Earlier onset and a more persistent pattern of sexual intercourse were associated with more childhood problem behaviors,…

Examined whether associations between marital discord and trajectories of adolescent depression and delinquency varied as a function of intrapersonal attributes. Found that difficult temperament potentiated effects of marital discord on adjustment trajectories. Heightened perceived family support protected adolescents from adverse marital discord…

This behavioral genetic study examined perceived competence and self-worth in same-sex twins, siblings, and stepsiblings 10 to 18 years old, and again 3 years later. Findings at second assessment showed six of seven subscales heritable. Genetic contributions to stability were found for perceived scholastic competence, athletic competence, physical…

Examined effects of work intensity on 1,000 employed adolescents. Found that students who worked at higher intensity engaged in more alcohol use. Negative effects on mental health, academic achievement, and 2 other indicators of behavioral adjustment were not found, but seniors working at moderate intensity (fewer than 20 hours per week) had…

Interviewed 120 early, mid, and late adolescents of lower-class Chinese families to examine adolescent-parent conflict. Found that conflicts were primarily with mothers, of moderate frequency and severity, and occurred over everyday issues. Adolescents wanted greater autonomy in decision making than their parents granted them, but parents' views…

Studied relationship between adolescents' sleep/wake habits and daytime functioning. Found that self-reported total sleep times decreased from age 13 to 19 years. Struggling or failing students obtained less sleep, went to bed later, and had greater weekend delays of sleep than those with better grades. Students with inadequate sleep reported…

Tested model relating girls' pubertal timing to mothers' history of psychopathology, mediated by family discord and father absence/stepfather presence. Found that mothers' history of mood disorders predicted earlier daughters' puberty, with the relation fully mediated by dyadic stress and biological father absence. Stepfather presence best…

Examined impact of experimentally altering mothers' style when discussing sexuality and AIDS with adolescent children. Found that intervention group mothers reduced their amount of speaking, asked more open-ended questions, acted less judgmental, and discussed dating and sexuality more than did control group mothers. Intervention group adolescents…