Psychology must confront the bias in its broad literature toward the study of participants developing in environments unrepresentative of the vast majority of the world's population. Here, we focus on the implications of addressing this challenge, highlight the need to address overreliance on a narrow participant pool, and emphasize the value and necessity of conducting research with diverse populations. We show that high-impact-factor developmental journals are heavily skewed toward publishing articles with data from WEIRD (Western, educated, industrialized, rich, and democratic) populations. Most critically, despite calls for change and supposed widespread awareness of this problem, there is a habitual dependence on convenience sampling and little evidence that the discipline is making any meaningful movement toward drawing from diverse samples. Failure to confront the possibility that culturally specific findings are being misattributed as universal traits has broad implications for the construction of scientifically defensible theories and for the reliable public dissemination of study findings.

This study relates parenting of 3-month-old children to children's self-recognition and self-regulation at 18 to 20 months. As hypothesized, observational data revealed differences in the sociocultural orientations of the 3 cultural samples' parenting styles and in toddlers' development of self-recognition and self-regulation. Children of Cameroonian Nso farmers who experience a proximal parenting style develop self-regulation earlier, children of Greek urban middle-class families who experience a distal parenting style develop self-recognition earlier, and children of Costa Rican middle-class families who experience aspects of both distal and proximal parenting styles fall between the other 2 groups on both self-regulation and self-recognition. Results are discussed with respect to their implications for culturally informed developmental pathways.

The role of culture in understanding human psychology has an ancient origin but a relatively short modern history and is still frequently subject to neglect. The idea that there is a continuous interaction between humans and their environments dates back to ancient Greek philosophers and historians, who

This study analyzed German and Nso mothers' auditory, proximal, and visual contingent responses to their infants' nondistress vocalizations in postnatal Weeks 4, 6, 8, 10, and 12. Visual contingency scores increased whereas proximal contingency scores decreased over time for the independent (German urban middle-class, N = 20) but not the interdependent sociocultural context (rural Nso farmers, N = 24). It seems, therefore, that culture-specific differences in the modal patterns of contingent responsiveness emerge during the 2nd and 3rd months of life. This differential development was interpreted as the result of the interplay between maturational processes associated with the 2-month shift that are selectively integrated and reinforced in culturespecific mother-infant interaction.

In this cross-cultural study, we tested 2 main hypotheses: first, that an early self-concept along with self-other differentiation is a universal precursor of prosocial behavior in 19-month-olds, and second, that the importance attached to relational socialization goals (SGs) concerning interpersonal responsiveness (obedience, prosocial behavior) is related to toddlers' prosocial behavior. Contrary to these predictions, the results show that mirror self-recognition, as an indicator of early self-concept, was correlated with toddlers' prosociality only in the Berlin sample (N = 38) and not in the Delhi sample (N = 39). As expected, however, Delhi mothers emphasized relational SGs more strongly than did Berlin mothers. There were no cross-cultural differences in toddlers' prosociality. On an individual level, mothers' emphasis on relational SGs (obedience) was a significant predictor of toddlers' prosocial behavior. On the basis of these results, we propose that situational helping behavior based on shared intentional relations provides an alternative developmental pathway for understanding toddlers' prosocial behavior. This view differs from the often-cited view that anticipating other people as autonomous intentional agents with their own psychological states gives rise to prosocial behavior in toddlers.