Marc H. Bornstein’s research while affiliated with Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health and other places

Due to its heavy reliance on convenience samples (CSs), developmental science has a generalizability problem that clouds its broader applicability and frustrates replicability. The surest solution to this problem is to make better use, where feasible, of probability samples, which afford clear generalizability. Because CSs that are homogeneous on one or more sociodemographic factor may afford a clearer generalizability than heterogeneous CSs, the use of homogeneous CSs instead of heterogeneous CSs may also help mitigate this generalizability problem. In this article, we argue why homogeneous CSs afford clearer generalizability, and we formally test this argument via Monte Carlo simulations. For illustration, our simulations focused on sampling bias in the sociodemographic factors of ethnicity and socioeconomic status and on the outcome of adolescent academic achievement. Monte Carlo simulations indicated that homogeneous CSs (particularly those homogeneous on multiple sociodemographic factors) reliably produce estimates that are appreciably less biased than heterogeneous CSs. Sensitivity analyses indicated that these reductions in estimate bias generalize to estimates of means and estimates of association (e.g., correlations) although reductions in estimate bias were more muted for associations. The increased employment of homogeneous CSs (particularly those homogeneous on multiple sociodemographic factors) instead of heterogeneous CSs would appreciably improve the generalizability of developmental research. Broader implications for replicability and the study of minoritized populations, considerations for application, and suggestions for sampling best practices are discussed.

Understanding of preterm infant cognitive competences across the first year of life is limited regarding the developmental constructs of continuity, stability, coherence, and predictive validity as well as how they manifest by age and country of origin. This prospective longitudinal study examined and compared mean-level continuity, individual-differences stability, and associations among several cognitive competences as well as their predictive validity across the first year of life in preterm infants (gestational age range = 26–33 weeks) from Chile ( n = 47), the United Kingdom ( n = 48), and the United States ( n = 50). Multiple cognitive competences (visual acuity measured with the Teller acuity card procedure; information processing duration of visual fixation and novelty preference examined with the Fagan Test of Infant Intelligence; Bayley Mental and Psychomotor Indexes) were evaluated at five different ages in preterm infants between 2 and 12 months in each country. The effects of infant age, country, and their interaction were examined. Visual acuity increased over time with different trajectories across countries, whereas duration of visual fixation decreased; both were stable across time. Novelty preference demonstrated continuity, but not stability across time and country. Associations among different cognitive competences varied by country. Across countries, duration of visual fixation predicted the Bayley Mental Development Index, and visual acuity predicted the Bayley Psychomotor Development Index. Cognitive competences develop in similar and dissimilar ways across the first year of life in infants born preterm from different countries. Cultural specificities and age variations are discussed. Study findings underscore the necessity to attend to specificities of domain, age, and place when assessing preterm infants’ cognitive competences.

This study advances the understanding of risk and protective factors in trajectories of conduct problems in adolescence in seven countries that differ widely on a number of sociodemographic factors as well as norms related to adolescent behavior. Youth- and parent-report data from 988 adolescents in seven countries (Colombia, Italy, Kenya, Philippines, Sweden, Thailand, and the USA) who were followed longitudinally from ages 10 to 18 (yielding 6872 total data points) were subject to latent class growth analysis. A 4-class model provided the best fit to the data: Late Starters, Alcohol Experimenters, Mid-Adolescent Starters, and Pervasive Risk Takers. The probability of membership in each class differed by country in ways that were generally consistent with country-specific norms and expectations regarding adolescent behavior. Positive parenting was associated with a lower likelihood of adolescents’ membership in the Pervasive Risk Takers class, whereas psychological control, monitoring/behavioral control, and autonomy granting were associated with a higher likelihood of membership in the Pervasive Risk Takers class. Associations between parenting and membership in the other classes suggest that some risk taking during adolescence is normative even when parenting is positive.

Introduction Prosocial behavior (i.e., voluntary actions aimed at benefiting others, such as helping, comforting, and sharing) has proven beneficial for individuals' adjustment during the transition to adolescence. However, less is known about the role of the broader sociocultural context in shaping prosocial development across different cultures. Thus, the present study explored the longitudinal trajectory of prosocial behavior in the transition to adolescence (from ages 9 to 16) by examining the role of the Human Development Index (HDI) in relation to prosocial development. Methods A sample of 915 children (Time 1: 50.5% males; M age = 9.24, SD = 0.69) across six countries (Colombia, Jordan, Italy, the Philippines, Thailand, and the United States) participated in the study. Over four time points covering 7 years, prosocial behavior was assessed using a self-report measure. Results A second-order Latent Growth Curve Model, controlling for child gender and family SES, showed that prosocial behavior remained stable in contexts with high HDI, whereas increases in prosocial behavior were evidenced as children moved into adolescence in contexts with low HDI. Moreover, cultural differences in the mean level of prosocial behavior were shown during late childhood and the earliest phase of adolescence, whereas the national development of a given context did not account for differences in prosocial behavior during late adolescence. Discussion Findings underscore that national life expectancy, education, and wealth play a role in age-related changes in other-oriented behaviors during adolescence. The role of sociocultural factors in shaping trajectories of prosocial behavior across six countries is discussed.

Inuit youth in Nunavut (NU) are resilient but face a protracted suicide crisis. The SPARX serious game and e-intervention, developed originally in New Zealand, teaches youth cognitive behavioural therapy (CBT) skills to ameliorate stress and depression. Inuit youth in NU reviewed and culturally adapted SPARX and an existing wellness outcome measure for Inuit. One hundred and twenty-one youth, aged 13 to 24, across NU then tested, played, and evaluated I(nuit)-SPARX, showing improvement in several areas of wellbeing post-play. Youth completed a CBT skills survey, engaged in sharing circles to assess CBT skill retention, and shared their thoughts about the usefulness and cultural fit of I-SPARX with Inuit Qaujimajatuqangit (IQ). Communication Skills, Listening Skills, and Problem Solving emerged as the most helpful learned CBT skills, and NU youth provided real-world examples of using I-SPARX skills to support their mental wellness. Several principles of IQ were exemplified and upheld in the content of the adapted SPARX tool and the process of the project as a whole. Empirically grounded, asynchronous e-tools, developed in collaboration with Inuit communities to ensure cultural specificity, may support psychological wellness in communities where mental health resources are scarce.

Relatively few studies have longitudinally investigated how COVID-19 has disrupted the lives and health of youth beyond the first year of the pandemic. This may be because longitudinal researchers face complex challenges in figuring out how to code time, account for changes in COVID-19 spread, and model longitudinal COVID-19-related trajectories across environmental contexts. This manuscript considers each of these three methodological issues by modeling trajectories of COVID-19 disruption in 1080 youth from 12 cultural groups in nine nations between March 2020-July 2022 using multilevel modeling. Our findings suggest that for studies that attempt to examine cross-cultural longitudinal trajectories during COVID-19, starting such trajectories on March 11, 2020, measuring disruption along 6-month time intervals, capturing COVID-19 spread using death rates and the COVID-19 Health and Containment Index scores, and using modeling methods that combine etic and emic approaches are each especially useful. In offering these suggestions, we hope to start methodological dialogues among longitudinal researchers that ultimately result in the proliferation of research on the longitudinal impacts of COVID-19 that the world so badly needs.

One species-general life history (LH) principle posits that challenging childhood environments are coupled with a fast or faster LH strategy and associated behaviors, while secure and stable childhood environments foster behaviors conducive to a slow or slower LH strategy. This coupling between environments and LH strategies is based on the assumption that individuals’ internal traits and states are independent of their external surroundings. In reality, individuals respond to external environmental conditions in alignment with their intrinsic vitality, encompassing both physical and mental states. The present study investigated attachment as an internal mental state, examining its role in mediating and moderating the association between external environmental adversity and fast LH strategies. A sample of 1169 adolescents (51% girls) from 9 countries was tracked over 10 years, starting from age 8. The results confirm both mediation and moderation and, for moderation, secure attachment nullified and insecure attachment maintained the environment-LH coupling. These findings suggest that attachment could act as an internal regulator, disrupting the contingent coupling between environmental adversity and a faster pace of life, consequently decelerating human LH.