Nature-nurture reconceptualized in developmental perspective: a bioecological model

Genetic and environmental influences on internalizing psychopathology vary as a function of economic status

BACKGROUND

Different theories of the link between socio-economic status (SES) and mental illness have been postulated. In particular, two theories of this association, social causation and social selection, differ in the implied causal pathway. The authors employ behavior genetic modeling to consider evidence for both social selection and social causation in the relationship between income variation and internalizing disorders.

METHOD

Behavior genetic modeling was used to estimate the presence of gene-environment interaction (GxE, social causation) in the presence of gene-environment correlation (rGE, social selection). Participants were members of a sample of 719 twin pairs from the Midlife in the United States study. Four internalizing (INT) syndromes were assessed: major depression (MD); generalized anxiety disorder (GAD); panic attacks (PA); neuroticism (N). SES was measured with total family household income.

RESULTS

One factor best accounted for the variance shared between MD, GAD, PA and N. The etiology of variation in INT changed from high to low levels of income, with unique environmental factors playing a larger role in INT variation at lower levels of income. Across levels of income, rGE between income and INT was modest (low income ra=0.39 to high income ra=0.54), implying a selection process operating through genetic effects linking lower income with INT psychopathology.

CONCLUSIONS

Findings support social causation by suggesting that low income contributes significantly to environmental variation in INT. Modest support was found for social selection, but should be extended using longitudinal designs. Effective interventions for internalizing psychopathology may differ depending on income.

Daytime sleep and parenting interactions in infants born preterm

OBJECTIVE

After a transactional perspective, this longitudinal study assessed concurrent and time-lagged associations between infant daytime sleep behaviors and maternal play interactions within a sample of infants born preterm.

METHOD

Data were collected from 134 families recruited from 3 Wisconsin neonatal intensive care units. Multiple methods were used to collect data at infant neonatal intensive care unit discharge and when infants were 4, 9, and 24 months postterm, including parent report infant sleep logs, family sociodemographic assets, and a 15-minute video-taped play session.

RESULTS

Within time points, infants who napped more had mothers who were rated as more positive and communicative or less negative during play interactions at 4, 9, and 24 months compared with infants who napped less. Time-lagged findings indicated that infants who took more naps experienced more optimal maternal interactive behaviors later in development than infants who took fewer naps. In addition, mothers who expressed more negative affect at 4 or 9 months predicted more infant daytime sleep later in development.

CONCLUSION

Previous studies document that nighttime parent-child interactions influence nighttime sleep. This study presents the natural extension that daytime sleep influences daytime interactions. This study draws attention to the understudied area of daytime naps in young children and provides support for the longitudinal bidirectional processes between sleep and parenting interactions.

Children's contact with their incarcerated parents: research findings and recommendations

Approximately 1.7 million children have parents who are incarcerated in prison in the United States, and possibly millions of additional children have a parent incarcerated in jail. Many affected children experience increased risk for developing behavior problems, academic failure, and substance abuse. For a growing number of children, incarcerated parents, caregivers, and professionals, parent-child contact during the imprisonment period is a key issue. In this article, we present a conceptual model to provide a framework within which to interpret findings about parent-child contact when parents are incarcerated. We then summarize recent research examining parent-child contact in context. On the basis of the research reviewed, we present initial recommendations for children's contact with incarcerated parents and also suggest areas for future intervention and research with this vulnerable population.

Emergence of a Gene x socioeconomic status interaction on infant mental ability between 10 months and 2 years

Recent research in behavioral genetics has found evidence for a Gene × Environment interaction on cognitive ability: Individual differences in cognitive ability among children raised in socioeconomically advantaged homes are primarily due to genes, whereas environmental factors are more influential for children from disadvantaged homes. We investigated the developmental origins of this interaction in a sample of 750 pairs of twins measured on the Bayley Short Form test of infant mental ability, once at age 10 months and again at age 2 years. A Gene × Environment interaction was evident on the longitudinal change in mental ability over the study period. At age 10 months, genes accounted for negligible variation in mental ability across all levels of socioeconomic status (SES). However, genetic influences emerged over the course of development, with larger genetic influences emerging for infants raised in higher-SES homes. At age 2 years, genes accounted for nearly 50% of the variation in mental ability of children raised in high-SES homes, but genes continued to account for negligible variation in mental ability of children raised in low-SES homes.

Determinants of social participation--with friends and others who are not family members--for youths with cerebral palsy

BACKGROUND

Social participation provides youths with opportunities to develop their self-concept, friendships, and meaning in life. Youths with cerebral palsy (CP) have been reported to participate more in home-based leisure activities and to have fewer social experiences with friends and others than youths without disabilities.

OBJECTIVE

The objective of this study was to identify youth, family, and service determinants of the participation of youths with CP in leisure activities with friends and others who are not family members.

DESIGN

The study design was a cross-sectional analysis.

METHODS

The participants were 209 youths who were 13 to 21 years old (52% male), had CP, and were classified in Gross Motor Function Classification System (GMFCS) levels I to V as well as their parents. The participants were recruited from 7 children's hospitals in 6 different states. Youths completed the Children's Assessment of Participation and Enjoyment in structured interviews. Parents completed the Coping Inventory, Pediatric Outcomes Data Collection Instrument, Family Environment Scale, Measure of Processes of Care, and demographic and service questionnaires. Researchers determined GMFCS levels. A sequential multiple regression analysis was used to determine the youth, family, and service variables that predicted participation with friends and with others who were not family members.

RESULTS

Sports and physical function, communication or speech problems, educational program, and the extent to which the desired community recreational activities were obtained explained 45.8% of the variance in the number of activities engaged in with friends. A higher level of parental education explained 6.3% of the variance in the number of activities engaged in with others who were not family members. Limitations The youths' activity preferences and intensity of participation were not examined.

CONCLUSIONS

/b> Youth and service characteristics were determinants of participation with friends but not others who were not family members. The findings have implications for the role of physical therapists in promoting sports and physical and communication abilities and enhancing community opportunities to optimize the social participation of youths with CP.

Contextos ecológicos em uma instituição de acolhimento para crianças

Esta pesquisa teve como objetivo conhecer o cotidiano de uma instituição de acolhimento de crianças de zero a seis anos localizada em um município do estado do Espírito Santo. Além disso, buscou-se compreender fatores implicados no desenvolvimento psicossocial das crianças em situação de acolhimento institucional, tendo como base a Teoria Bioecológica do Desenvolvimento Humano e o procedimento metodológico da inserção ecológica. Entre os núcleos apresentados na teoria, este artigo priorizou a análise do contexto. Os resultados mostram que vários aspectos relacionados ao cotidiano da instituição contribuem para o desenvolvimento psicossocial das crianças - dentre os quais, a oferta de condições institucionais que conduzem a oportunidades de convívio saudável com cuidadores e outras crianças, além da promoção de vivências em vários níveis ambientais -, o que amplia e fortalece a rede de apoio social das crianças e das suas respectivas famílias.

Environmental Moderators of Genetic Influences on Adolescent Delinquent Involvement and Victimization

A growing body of empirical research reveals that genetic factors account for a substantial amount of variance in measures of antisocial behaviors. At the same time, evidence is also emerging indicating that certain environmental factors moderate the effects that genetic factors have on antisocial outcomes. Despite this line of research, much remains unknown about the specific environments that may moderate genetic influences on adolescent delinquent involvement and victimization. The current study addresses this gap in the literature by examining whether 13 criminogenic environments alter the extent to which genes influence delinquency and victimization. Analysis of sibling pairs drawn from the National Longitudinal Study of Adolescent Health revealed significant environmental moderation of genetic influences on measures tapping serious delinquency, violent delinquency, and personal victimization. In general, greater exposure to criminogenic risk factors increases the effects that genetic factors have on these three antisocial outcomes. The implications that these findings have for criminological theory and research are discussed.

Applying the ICF framework to study changes in quality-of-life for youth with chronic conditions

OBJECTIVE

The objective of this paper is to describe how the ICF framework was applied as the foundation for a longitudinal study of changes in quality-of-life (QoL) for youth with chronic conditions.

METHOD

This article will describe the study's aims, methods, measures and data analysis techniques. It will point out how the ICF framework was used--and expanded upon--to provide a model for studying the impact of factors on changes in QoL for youth with chronic conditions. Further, it will describe the instruments that were chosen to measure the components of the ICF framework and the data analysis techniques that will be used to examine the impact of factors on changes in youths' QoL.

CONCLUSIONS

Qualitative and longitudinal designs for studying QoL based on the ICF framework can be useful for unraveling the complex ongoing inter-relationships among functioning, contextual factors and individuals' perceptions of their QoL.

Environment, genes, and experience: lessons from behavior genetics

The article reviews the theoretical analysis of the problems inherent in studying the environment within behavior genetics across several periods in the development of environmental studies in behavior genetics and proposes some possible alternatives to traditional approaches to studying the environment in behavior genetics. The first period (from the end of the 1920s to the end of the 1970s), when the environment was not actually studied, is called pre-environmental; during this time, the basic principles and theoretical models of understanding environmental effects in behavior genetics were developed. The second period is characterized by the development of studies on environmental influences within the traditional behavior genetics paradigm; several approaches to studying the environment emerged in behavior genetics during this period, from the beginning of the 1980s until today. At the present time, the field is undergoing paradigmatic changes, concerned with methodology, theory, and mathematical models of genotype-environment interplay; this might be the beginning of a third period of development of environmental studies in behavior genetics. In another part, the methodological problems related to environmental studies in behavior genetics are discussed. Although the methodology used in differential psychology is applicable for assessment of differences between individuals, it is insufficient to explain the sources of these differences. In addition, we stress that psychoanalytic studies of twins and their experiences, initiated in the 1930s and continued episodically until the 1980s, could bring an interesting methodology and contribute to the explanation of puzzling findings from environmental studies of behavior genetics. Finally, we will conclude with implications from the results of environmental studies in behavior genetics, including methodological issues.

Culture is treatment: considering pedagogy in the care of Aboriginal people

This article presents an overview of culture as treatment, by recognizing the impact that culture has on treatment along with the specific rituals, customs, and meanings related to healing. Attention must be given to the Aboriginal heritage, including various concepts of metaphysics, spirituality, medicines, government, oral history, and language. A pedagogical underpinning of illness and healing is better cared for through cultural messaging and learning that is related to the complex historical legacy of Aboriginal societies, and therefore, culture provides important diverse contributions to current treatment and wellness programs.

Understanding the complex etiologies of developmental disorders: behavioral and molecular genetic approaches

OBJECTIVE

This article has 2 primary goals. First, a brief tutorial on behavioral and molecular genetic methods is provided for readers without extensive training in these areas. To illustrate the application of these approaches to developmental disorders, etiologically informative studies of reading disability (RD), math disability (MD), and attention-deficit hyperactivity disorder (ADHD) are then reviewed. Implications of the results for these specific disorders and for developmental disabilities as a whole are discussed, and novel directions for future research are highlighted.

METHOD

Previous family and twin studies of RD, MD, and ADHD are reviewed systematically, and the extensive molecular genetic literatures on each disorder are summarized. To illustrate 4 novel extensions of these etiologically informative approaches, new data are presented from the Colorado Learning Disabilities Research Center, an ongoing twin study of the etiology of RD, ADHD, MD, and related disorders.

CONCLUSIONS

RD, MD, and ADHD are familial and heritable, and co-occur more frequently than expected by chance. Molecular genetic studies suggest that all 3 disorders have complex etiologies, with multiple genetic and environmental risk factors each contributing to overall risk for each disorder. Neuropsychological analyses indicate that the 3 disorders are each associated with multiple neuropsychological weaknesses, and initial evidence suggests that comorbidity between the 3 disorders is due to common genetic risk factors that lead to slow processing speed.

A mentoring program for the promotion of sexual health among Korean adolescents

The purpose of this pilot study was to develop a mentoring program for the promotion of sexual health among Korean adolescents and to explore the effects of the program. A nonequivalent control group pre-test-post-test design was used. The mentoring intervention was conducted by eight nursing students who participated in the program as mentors using various methods such as formal group sessions and informal individual contacts. At the 12-week post-intervention, the interaction between time and group was statistically significant on both sexual knowledge and sexual attitude of the 17 adolescent mentees. The mentoring program demonstrated potential as a developmentally appropriate intervention for the sexual health promotion of adolescents and promises to enable nursing students to gain confidence in their professional capability.

Child care and the development of behavior problems among economically disadvantaged children in middle childhood

Research examining the longer term influences of child care on children's development has expanded in recent years, but few studies have considered low-income children's experiences in community care arrangements. Using data from the Three-City Study (N=349), the present investigation examines the influences of child care quality, extent and type on low-income children's development of behavior problems during middle childhood (7-11 years old). Higher levels of child care quality were linked to moderate reductions in externalizing behavior problems. High-quality child care was especially protective against the development of behavior problems for boys and African American children. Child care type and the extent of care that children experienced were generally unrelated to behavior problems in middle childhood.

Environmental and Individual Influences on Australian Young Adults' Likelihood of Attending University: A Follow-Up Study

In this longitudinal study, which is a follow-up analysis of a previous investigation (K. Marjoribanks, 2002a), the author examined environmental and individual influences on the likelihood of Australian young adults attending university. Participants were 5,181 Anglo-Australian (parents born in Australia, English was the language of the family), 460 Asian, 699 English (parents born in England), 746 European, and 163 Middle Eastern students (M age = 14.7 years, when the study began). The analyses indicated that Asian, European, and Middle Eastern young adults were more likely to attend university than were young adults from Anglo-Australian and English families, and young women had higher odds of attending university than did young men. Family social status variations in the likelihood of university attendance could be explained by differences in individual characteristics and proximal learning environments. Adolescents' individual characteristics and proximal learning environments combined to have a large independent association with the decision to attend university.

LATINO FAMILY MENTAL HEALTH: EXPLORING THE ROLE OF DISCRIMINATION AND FAMILISMO

The purpose of this study was to examine the role of discrimination and familismo on internalizing mental health symptoms among two generations of Latinos, youth and their parents, residing in the Southwest region of the United States. Data from the Latino Acculturation and Health Project was used to determine the direct and moderation effects of discrimination and familismo on internalizing mental health symptoms. The sample included 150 Latino youth-parent dyads who were immigrants or U.S. born. Descriptive results indicate that youth had significantly higher scores on the familismo scale whereas parents reported higher levels of perceived discrimination. Regression analyses results revealed direct effects of familismo and perceived discrimination on internalizing mental health symptoms. Implications for practice are discussed.

Parental perceptions of the parent-therapist relationship: effects on outcomes of early intervention

Federal law mandates that early intervention (EI) programs provide care using a family-centered model. The purpose of this preliminary study was to investigate (a) the relationship that develops between physical therapists and parents during EI and (b) a possible link between this relationship and EI outcomes. Thirty-nine parents of children with identified motor delays participated in this study. Data were collected through use of standardized measures and surveys developed for the study. Results of one-way ANOVA indicated that parents in the collaborative typology experienced significantly less stress and higher levels of parenting competence than parents in the distant typology. Parents in the collaborative typology also reported their EI program was more family centered. Child outcomes as related to the relationship typology were not significant, but the trend observed suggests further study is warranted. These findings suggest that measuring two specific relationship characteristics, satisfaction and control, may be helpful when trying to conceptualize and evaluate the parent-therapist relationship. This relationship evaluation may provide guidance to clinicians seeking to develop more collaborative relationships with families.

Long-term effects of social investment: the case of partnering in young adulthood

On the basis of the assumptions of the dynamic transactional paradigm, the current study investigates the effects of success and failure of social investment on personality development across young adulthood. Using longitudinal data from the Michigan Study of Adolescent and Adult Life Transitions (MSALT), the authors demonstrate that entering into the first long-term romantic relationship was accompanied by decreases in facets of neuroticism, thereby fully replicating findings by Neyer and Lehnart (2007) based on a German longitudinal study. In addition, remaining single over 8 years was related to decreasing self-esteem, especially for men. These results demonstrate long-term effects of investment and lack of investment in social roles and provide further evidence of the interrelatedness of social or relationship experiences and personality development.

Do mothers' play behaviors moderate the associations between socioeconomic status and 24-month neurocognitive outcomes of toddlers born preterm or with low birth weight?

OBJECTIVE

We examined whether neonatal risks and maternal scaffolding (i.e., task changes and flexibility) during a 16-month post-term play interaction moderated the association between socioeconomic status (SES), visual-spatial processing and emerging working memory assessed at 24 months post-term among 75 toddlers born preterm or low birth weight.

METHOD

SES and neonatal risk data were collected at hospital discharge and mother-child play interactions were observed at 16-month post-term. General cognitive abilities, verbal/nonverbal working memory and visual-spatial processing data were collected at 24 months.

RESULTS

Neonatal risks did not moderate the associations between SES and 24-month outcomes. However, lower mother-initiated task changes were related to better 24-month visual-spatial processing among children living in higher SES homes. Mothers' flexible responses to child initiated task changes similarly moderated the impact of SES on 24-month visual-spatial processing.

CONCLUSION

Our results suggest that mothers' play behaviors differentially relate to child outcomes depending on household SES.

Adherence to honor code mediates the prediction of adolescent boys' conduct problems by callousness and socioeconomic status

Although there is considerable evidence that culture-related factors are associated with aggressive behavior, their effect on the development of conduct problems (CP) has been insufficiently studied. This study focused on adherence to honor code (AHC), defined by the endorsement of honor culture attitudes at the identity narrative level of personality assessment, as a mediator in the prediction of CP by callousness, insecure attachment, and socioeconomic status. Our sample of 136 adolescent boys (M age = 15.02, SD = 1.48) oversampled high- and low-level Israeli schools, both academically and behaviorally. Structural equation modeling supported the theoretical model: AHC was a significant predictor of CP and partially mediated the prediction of CP by callousness and socioeconomic status. Insecure attachment predicted AHC but was not an independent predictor of CP.

Improvement in intelligence test scores from 6 to 10 years in children of teenage mothers

OBJECTIVE

This study investigates change in IQ scores among 290 children born to teenage mothers and identifies social, economic, and environmental variables that may be associated with change in intelligence test performance.

METHODS

The children of 290 teenage mothers (72% African-American and 28% European American) were assessed with the Stanford-Binet Intelligence Scale-4th Edition at ages 6 and 10.

RESULTS

The mean composite score at age 6 was 84.8 and 91.2 at age 10, an improvement of 6.4 points. Significant cross-sectional predictors at both ages 6 and 10 of higher Stanford-Binet Intelligence Scale scores were maternal cognitive ability, school grade, white ethnicity, and caregiver education. Having more children in the household significantly predicted lower Stanford-Binet Intelligence Scale scores at age 6. Higher satisfaction with maternal social support predicted higher Stanford-Binet Intelligence Scale scores at age 10. Change in IQ scores was not related to maternal socioeconomic status, social support, home environment, ethnicity, or family interactions. Custodial stability was associated with an improvement in IQ scores, whereas increase in caregiver depression was related to decline in IQ scores.

CONCLUSIONS

Our findings suggest that improvement in IQ scores of offspring of teenage mothers may be related to stability of maternal custody. More research is needed to determine the impact of the maturation of adolescent mothers' parenting and the role of early education on improvement in cognitive abilities.

Neurodevelopmental and psychological assessment of adolescents born to drug-addicted parents: effects of SES and adoption

OBJECTIVES

Prenatal exposure to heroin may have long-term consequences for development during early and middle childhood. The present research studied the cognitive, social, and emotional functioning of adolescents exposed to drugs prenatally, and investigated the extent to which the early adoption of children exposed prenatally to drugs would alleviate the possible effects of exposure.

METHODS

The study included 191 adolescents (12-16 years of age) and their parents in Israel, who had or had not been exposed prenatally to drugs and differing in socio-economic status (SES), and in adoptive status. They were administered five subtests of the Wechsler Intelligence Scale for Children (WISC-III), and the Youth Self-Report Form for assessing behavior problems that measures problems associated with attention deficit, self-esteem and risk-taking. Parents were administered the Child Behavior Checklist (CBCL) for assessing behavior problems, the Conners Rating Scale (CRS) for assessing attention deficit problems in their children and the Wender Utah Rating Scale (WURS), a self-report measure of ADHD-related problems.

RESULTS

Adolescents exposed to at least one risk factor (exposure to drugs, low SES, or adoption) performed more poorly than those exposed to none of these risk factors on the WISC-III subtests, the CBCL and the CRS. The effects of risk factors did not cumulate. Contrary to our hypothesis, adoption did not mitigate the effects of prenatal exposure to drugs: for cognitive functioning exposure to drugs was associated with poorer performance among the exposed High SES Adopted versus non-exposed High SES non-adopted children on three of the WISC-III subtests. Exposed low SES children living with their parents performed at the same relatively low level as non-exposed low SES controls. Exposure to drugs was associated with adult ADHD-related problems assessed by the WURS. There were no direct or interaction effects of exposure on neurological functioning, self-competence, behavior problems on the CBCL or risk-taking.

CONCLUSIONS

Children exposed to drugs of abuse prenatally, including those adopted away, and children who grow up in low SES backgrounds, may be at risk of relatively reduced cognitive functioning (though still within the normal range) in adolescence. Children exposed to drugs, who are from low SES backgrounds, or who are adopted, may be at risk for lower cognitive or social functioning than children who have not experienced such risks.

PRACTICE IMPLICATIONS

There is a need for implementing early monitoring and long-term intervention programs featuring encouragement of cognitive and social skills for children prenatally exposed to drugs in order to alleviate the possible long-term effects of exposure to risk.

Parent involvement and children's academic and social development in elementary school

Data from the National Institute of Child Health and Human Development (NICHD) Study of Early Childcare and Youth Development (N = 1,364) were used to investigate children's trajectories of academic and social development across 1st, 3rd, and 5th grades. Hierarchical linear modeling was used to examine within- and between-child associations among maternal and teacher reports of parent involvement and children's standardized achievement scores, social skills, and problem behaviors. Findings suggest that within-child improvements in parent involvement predict declines in problem behaviors and improvements in social skills but do not predict changes in achievement. Between-child analyses demonstrated that children with highly involved parents had enhanced social functioning and fewer behavior problems. Similar patterns of findings emerged for teacher and parent reports of parent involvement. Implications for policy and practice are discussed.

Teacher quality moderates the genetic effects on early reading

Children's reading achievement is influenced by genetics as well as by family and school environments. The importance of teacher quality as a specific school environmental influence on reading achievement is unknown. We studied first- and second-grade students in Florida from schools representing diverse environments. Comparison of monozygotic and dizygotic twins, differentiating genetic similarities of 100% and 50%, provided an estimate of genetic variance in reading achievement. Teacher quality was measured by how much reading gain the non-twin classmates achieved. The magnitude of genetic variance associated with twins' oral reading fluency increased as the quality of their teacher increased. In circumstances where the teachers are all excellent, the variability in student reading achievement may appear to be largely due to genetics. However, poor teaching impedes the ability of children to reach their potential.

Examining the development and sexual behavior of adolescent males

A careful examination of young men's sexuality by health professionals in pediatrics, primary care, and reproductive health is foundational to adolescent male sexual health and healthy development. Through a review of existing published data, this article provides background and a developmental framework for sexual health services for adolescent boys. The article first defines and provides an overview of adolescent boys' sexual health, and then discusses developmentally focused research on the following topics: (1) early romantic relationships and the evolution of power and influence within these relationships; (2) developmental "readiness" for sex and curiosity; (3) boys' need for closeness and intimacy; (4) adopting codes of masculinity; (5) boys' communicating about sex; and (6) contextual influences from peers, families, and providers. This article concludes by examining the implications of these data for sexual health promotion efforts for adolescent males, including human papillomavirus vaccination.

The 'I know you' and the 'you know me' of mutual goal knowledge in partnerships: differential associations with partnership satisfaction and sense of closeness over time

Personal goals, that is, ideas of what one wants to maintain, attain, or avoid in the future, are pursued within social contexts and may influence the social systems a person belongs to. Focusing on romantic partnerships as one of the most important social contexts in adulthood, this longitudinal study investigated the role of partners' mutual goal knowledge for partnership development (T1: N=69 couples; T2: N=47). Partners described their own personal goals and the goals they assumed their partners to have. Trained coders rated the overlap between the self-reported and the ascribed goals. Actor-partner interdependence models showed that knowing one's partner's goals was associated with a higher level of partnership satisfaction after about 16 months, controlling for initial partnership satisfaction. Having a partner who knows one's goals, by contrast, predicted greater feelings of closeness to that partner after the same period of time, controlling for initial levels of closeness; and this association could not be attributed to a greater similarity between both partners' goals. Overall, this research shows that both the 'I know you' and the 'You know me' components contribute to positive partnership development, and that their specific implications vary for different facets of partnership quality.

Does parental education have a moderating effect on the genetic and environmental influences of general cognitive ability in early adulthood?

Hereditary influences account for a substantial proportion of the variance in many cognitive abilities. However, there is increasing recognition that the relative importance of genetic and environmental influences may vary across different socioeconomic levels. The overall goal of the present study was to examine whether parental education has a moderating effect on genetic and environmental influences of general cognitive ability in early adulthood (age 19.6 +/- 1.5). Participants were 5,955 male twins from the Vietnam Era Twin (VET) Registry. Significant effects of parental education on mean level of general cognitive ability scores were found, but a model without moderating effects of parental education on genetic or environmental influences on cognitive scores proved to be the best fitting model. Some, but not all, previous studies have found significant moderating effects; however, no consistent pattern emerged that could account for between-study differences regarding moderating effects on genetic and environmental influences.

Predicting children's media use in the USA: differences in cross-sectional and longitudinal analysis

The purpose of this paper is to examine the predictors of children's media use in the USA, comparing cross-sectional and longitudinal analyses. Data come from Waves I and 2 of the Child Development Supplement (CDS-I; CDS-II), a nationally representative sample of American children aged 0-12 in 1997 and 5-18 in 2002. Twenty-four hour time use diaries are used to assess children's time spent with media (television, video games, computers, and reading). Predictors examined include socio-demographics, neighbourhood quality, family factors, and other media use. Ordinary least square (OLS) multiple regressions were performed by three age groups (preschoolers, early school age, and preadolescence). The findings suggest that neighbourhood quality, parental limits and family conflict are significant predictors of children's media use within time or over time, but the significance depends on the type of media and child's developmental stage. In addition, children's television viewing and reading habits are formed early in life and reinforced over time. This study is among the first to provide empirical evidence for the effect of early contextual factors on the life course of children's media use from a developmental perspective.

Sex differences in the structure and stability of children's playground social networks and their overlap with friendship relations

Gender segregated peer networks during middle childhood have been highlighted as important for explaining later sex differences in behaviour, yet few studies have examined the structural composition of these networks and their implications. This short-term longitudinal study of 119 children (7-8 years) examined the size and internal structure of boys' and girls' social networks, their overlap with friendship relations, and their stability over time. Data collection at the start and end of the year involved systematic playground observations of pupils' play networks during team and non-team activities and measures of friendship from peer nomination interviews. Social networks were identified by aggregating play network data at each time point. Findings showed that the size of boy's play networks on the playground, but not their social networks, varied according to activity type. Social network cores consisted mainly of friends. Girl's social networks were more likely to be composed of friends and boys' networks contained friends and non-friends. Girls had more friends outside of the social network than boys. Stability of social network membership and internal network relations were higher for boys than girls. These patterns have implications for the nature of social experiences within these network contexts.

The development of effortful control in children born preterm

This prospective longitudinal study examined emerging effortful control skills at 24- and 36-months postterm in 172 children born preterm (<36 weeks gestation). Infant (neonatal health risks), family (sociodemographic risks), and maternal risk factors (depressive symptoms, anger expressions during play interactions) were assessed at six time points across 3 years. In addition, children's emerging effortful control skills, cognitive development, and mother-reported behavior and attention problems were assessed at 24 and 36 months. Analyses documented links between effortful control skills, cognitive skills, and concurrent attention problems in children born preterm. The study also found that preterm children's effortful control skills improved over time. In addition, neonatal health risks, family sociodemographic risks, and angry parenting interactions were associated with less optimal effortful control skills.

Leaving School Early – and Making It!

Leaving school early is generally associated with relative poor adult outcomes, as indicated by relative low social status, reduced earnings, and poor mental health. Yet, not all young people leaving school early are failing to make it. Some are able to find continuous employment and achieve financial independence. Comparing the experiences of two British Birth cohorts born in 1958 and 1970, respectively, this study examines the trajectories of young people leaving school early, and identifies factors associated with a successful transition, that is achieving financial independence. The study comprises 11,219 individuals born in 1958 and 9,541 born in 1970 following their lives from childhood into adulthood. While the majority of young people born in 1958 left school at age 16 to enter the labor market, increasing numbers of young people born in 1970 are participating in further and higher education. In both cohorts those young people who left school early and who succeeded in reaching financial independence by age 34 showed higher school motivation than those who failed to make it. The findings highlight the importance of building up positive attitudes for learning among children and their parents, as these factors have long-term beneficial effects, even for those who are leaving school early. Moreover, the role of macro-economic circumstances has to be acknowledged for a better understanding of variation in transition experiences in times of social change.

Nonresident fathers' parenting, family processes, and children's development in urban, poor, single-mother families

With dramatic growth in nonrmarital births, an increasing number of children are growing up in single-mother families. This study examines the relationships among nonresident fathers' parenting and children's behavioral and cognitive development in low-income, single-mother families. It also considers the personal characteristics of the children's single mothers as well as family processes and economic circumstances. Analyses use the first three waves of longitudinal data from a subsample of single and noncohabiting mothers in the Fragile Families and Child Wellbeing Study. Results suggest that nonresident fathers' parenting is indirectly associated with children's behavior problems and cognitive development. The findings further suggest that those estimated associations are transmitted through mothers' parenting. The study also discusses the policy and practice implications of its findings.

Furthering the understanding of parent-child relationships: a nursing scholarship review series. Part 3: Interaction and the parent-child relationship--assessment and intervention studies

PURPOSE

This integrative review concerns nursing research on parent-child interaction and relationships published from 1980 through 2008 and includes assessment and intervention studies in clinically important settings (e.g., feeding, teaching, play).

CONCLUSIONS

Directions for research include development of theoretical frameworks, valid observational systems, and multivariate and longitudinal data analytic strategies.

PRACTICE IMPLICATIONS

Observation of social-emotional as well as task-related interaction qualities in the context of assessing parent-child relationships could generate new questions for nursing research and for family-centered nursing practice.

Educational Policy and Country Outcomes in International Cognitive Competence Studies

Prior studies of studentsqqaposxx and adultsqqaposxx cognitive competence have shown large differences between nations, equivalent to a difference of 5 to 10 years of schooling. These differences seem to be relevant because studies using different research paradigms have demonstrated that population-level cognitive abilities are related to a number of important societal outcomes, including productivity, democratization, and health. In this overview of transnational differences, we document a number of positive predictors of international differences in student competence, including the amount of preschool education, student discipline, quantity of education, attendance at additional schools, early tracking, the use of centralized exams and high-stakes tests, and adult educational attainment. We found rather negative relationships for grade retention rates, age of school onset, and class size. Altogether, these results, when combined with the outcomes of earlier studies, demonstrate that international differences in cognitive competence can be explained in part by aspects of the respective countriesqqaposxx educational systems and that these differences consequently can be reduced by reform of their educational policy. This has important implications not just for closing gaps in educational achievement, but for narrowing international gaps in wealth, health, and democracy.