International Journal of Behavioral Development

In this Introduction, we highlight key themes in the conceptualization and measurement of social capital, drawing attention to its developmental roots, manifestations, and implications for health and well-being across the life course. Longitudinal methods are uniquely suited for charting pathways to and from social capital and for elucidating intermediate and proximal mechanisms that may explain its emergence and its role in healthy functioning. The four empirical articles in the Special Section make use of well-known longitudinal data sets to examine vertical and horizontal dimensions of social capital within and across critical developmental transitions. Collectively, the articles situate the construct of social capital within a behavioral perspective and shed new light on the nature and effectiveness of social relationships in the development of individual competence.

The aim of this study was to investigate the role of social capital assessed in early adulthood in linking self-control in childhood with psychological and social functioning in middle age. Data collected at ages 8, 27, and 42 years were based on the Jyväskylä Longitudinal Study of Personality and Social Development (159 females, 177 males). Self-control was assessed at age 8 using teacher ratings and peer nominations. Social capital at age 27 was operationalized in terms of the breadth of the individuals’ social network and the depth of their close relationships. Psychological functioning at age 42 was indicated by, for instance, psychological well-being, and social functioning was indicated by, for instance, aggression. Results showed for females, but not for males, that social capital partially mediated the link between self-control and psychological well-being, as well as the link between self-control and aggression. In females, higher self-control explained better psychological well-being and lower aggression both directly and indirectly via the breadth of the individual’s social network. In males, both childhood self-control and behavioral activity contributed to the breadth of their social network, which, in turn, contributed to the depth of their close relationships. Deeper relationships explained better psychological well-being and, marginally, lower aggression; male lower aggression was directly accounted for by childhood self-control.

The predictive relations between social capital depth (high-quality relationships across contexts) and breadth (friendship network extensivity) and early-adult life adjustment outcomes were examined using data from a prospective longitudinal study. Interviews at age 22 yielded (a) psychometrically sound indexes of relationship quality with parents, peers, and romantic partners that served as indicators of a latent construct of social capital depth, and (b) a measure of number of close friends. In follow-up interviews at age 24, participants reported on their behavioral adjustment, educational attainment, and arrests and illicit substance use. Early-adolescent assessments of behavioral adjustment and academic performance served as controls; data on what were construed as interpersonal assets (teacher-rated social skills) and opportunities (family income) were also collected at this time. Results showed that depth was associated with overall better young-adult adjustment, net of prior adjustment, and assets and opportunities. Breadth was only modestly associated with later outcomes, and when its overlap with depth was taken into account, breadth predicted higher levels of subsequent externalizing problems. These findings are consistent with the notion that social capital is multidimensional and that elements of it confer distinct benefits during an important life transition.

Social capital has traditionally been defined in terms of the amount of resources that one derives as a result of a diversity of interpersonal relationships. However, the quality of these relationships across development has not been examined as a contributor to social capital and few studies have examined the significance of various age-salient relationships in predicting adaptive functioning, especially testing for cumulative effects over time. Using data from the Minnesota Longitudinal Study of Risk and Adaptation, developmental models spanning from infancy to adulthood were tested via path modeling, linking quality of various age-salient relationships (e.g., infant–caregiver attachment, peer competence, friendship security, and effectiveness in romantic relationships) to global adaptive functioning at age 28. As hypothesized, quality of age-salient relationships during different developmental periods predicted the quality of subsequent relationships, but also showed links with adaptive functioning in early adulthood. Results also showed that the quality of infant attachment relationships not only was linked with more proximal relationships, but also had direct effects on global functioning, suggesting the potential significance of early relationship quality in adaption and well-being in adulthood.

With the aim of identifying and examining both convergence (matched relationship quality across one’s set of relationships) and nonconvergence (mixed relationship quality across one’s set of relationships), the present study used a pattern-centered approach to examine the different ways adolescent relationships pattern together among a large, national sample of U.S. adolescents (aged 13–19). The study also examined how adolescent adjustment and young-adult relationship quality varied across the different relationship patterns or constellations. The current study used latent class analysis and data from Add Health (n = 4,233), a national U.S. longitudinal study that spans adolescence and young adulthood, to uncover heterogeneity in adolescent relations with parents, friends, romantic partners, peers, and teachers. As predicted, patterns of both convergence and nonconvergence were found, though patterns of nonconvergence were more common than expected. Some patterns of nonconvergence appear more stable (i.e., similar pattern found during both adolescence and young adulthood) than others. Also, no “high” converging pattern was found, indicating that few adolescents have “first-rate” relations in every relational domain.

Recent findings from Western developed countries have linked home chaos to children’s cognitive performance and behavioral problems. In the present paper we test whether the same pattern of associations can be replicated in a non-Western developing country. Our sample was 203 Pakistani primary school children. To assess home chaos the Confusion, Hubbub, and Order Scale (CHAOS) was translated into Urdu and administered to mothers. Children were assessed using the parent and teachers rating forms of the Behavioral Assessment System for Children and the Raven's Standard Progressive Matrices. Home chaos was not related to children’s cognitive performance. However, replicating previous findings from Western developed countries, greater home chaos uniquely predicted higher levels of internalizing and externalizing behavioral problems as well as lower levels of adaptive behavior in Pakistani children, as rated by both mothers and teachers.

Pregnancy and early motherhood involve uncertainty and change, which can evoke mental health problems. We identified maternal mental health trajectories in pre- and postnatal period, and examined their association with later child mental health and development. Finnish mothers reported psychological distress (General Health Questionnaire [GHQ-36]) and depressive (Beck Depression Inventory [BDI-13]) symptoms in pregnancy (T1; N = 788) and two months (T2; N = 657) and 12 months (T3; N = 545) postpartum. Both parents accounted their child’s mental health (Behavior Assessment System for Children [BASC]) and social (Social Skills Rating System [SSRS], Child Behavior Scale [CBS]) and cognitive development (Five to Fifteen [FTF]) when the child was 7–8 years old (T4; N = 485). We identified five trajectories depicting unique timing and course of maternal mental health from pregnancy into 1 year of mothering: Stable low levels of mental health symptoms (75%) and prenatal (6%), early postpartum (9%) and late postpartum (6%) mental health problems. The fifth trajectory, heterogeneous high levels of mental health problems (4%) was an unclassified post hoc class, combining mothers with chronic high or highly variable mental health profiles. Results show some trajectory-related timing effects on children’s mental health and cognitive development. The trajectories of early postpartum and heterogeneous high levels of mental health problems predicted higher level of internalizing symptoms as compared to stable low-levels trajectory. The heterogeneous high-levels trajectory predicted higher levels of problems in executive functions than the stable low and late postpartum trajectories, and in memory tasks than children in other trajectories. We discuss the timing and course of maternal mental health from the viewpoint of infant and child development.

The development of a diachronic conception of biology has rarely been explored during childhood, except by Maurice-Naville and Montangero (1992). The aim of the present study was to further explore this issue. In the course of an interview, 163 children aged between 6 and 11 expressed their diachronic conceptions of the growth and death of several living things. Results confirmed previous data and extended them to humans and animals, highlighting some diachronic dimensions previously identified by Maurice-Naville and Montangero regarding trees: past and future, seriation and identity appear before 10 years of age, while time span and rhythm, as well as irreversibility, were only mastered at 11 years. Our results confirm that the mastery of biological properties during childhood is partly contingent upon diachronic thinking.

This paper presents the psychometric properties of the Polish version of the Infant Behavior Questionnaire—Revised (IBQ-R). A group of 396 pairs of parents was studied, and a 3-factor structure of IBQ-R emerged with differences comparing to the original U.S. sample and a prior replication Russian sample. Analyses demonstrated satisfactory internal consistency and high consistency rating between both parents' scores. Additionally, a comparison of the scores of IBQ-R scales between Polish and previously reported U.S. data was made, showing that Polish infants scored higher on negative affectivity scales and lower on surgency/extraversion and orientation/regulation scales.

Null hypothesis testing (NHT) is the most commonly used tool in empirical psychological research even though it has several known limitations. It is argued that since the hypotheses evaluated with NHT do not reflect the research-question or theory of the researchers, conclusions from NHT must be formulated with great modesty, that is, they cannot be stated in a confirmative way. Since confirmation or theory evaluation is, however, what researchers often aim for, we present an alternative approach that is based on the specification of explicit, informative statistical hypotheses. The statistical approach for the evaluation of these hypotheses is a Bayesian model-selection procedure. A non-technical explanation of the Bayesian approach is provided and it will be shown that results obtained with this method give more direct answers to the questions asked and are easier to interpret. An additional advantage of the offered possibility to formulate and evaluate informative hypotheses is that it stimulates researchers to more carefully think through and specify their expectations.