Developmental Psychology

Collaboration is an early emerging component of successful cooperative relations that produces a cascade of positive social preferences between collaborators. Concurrently, robust preferences for affiliated others may restrict these benefits to in-group peers. We investigated how in-group affiliation (based on minimal group markers) and interpersonal affiliation (based on shared preferences) influence children's collaborative partner choice. We asked whether children prefer to collaborate with affiliated peers and if highlighting interpersonal affiliation with out-group members reduce in-group bias in partner choice...

For lesbian, gay, bisexual, or queer (i.e., sexual minority [SM]) youth, coming out is an important developmental milestone and is typically associated with positive well-being. However, coming out in high school may entail a higher risk of school-based victimization. Due to the greater risk of homophobic bullying, the implications of being out in adolescence and well-being later in adulthood remain unclear. Using data from a national probability survey (Generations Study) of three distinct age cohorts of SM adults ( N = 1,474) in the United States, this study (a) examined how being out at school in adolescence affects general well-being in adulthood and (b) SM-specific well-being in adulthood, and (c) examined if these associations differ by cohort...

Fear reactivity is an early emerging temperament trait that predicts longer term behavioral and health outcomes. The current analysis tests the hypothesis, an extension of prior research on maternal immune activation (MIA), that the prenatal maternal immune system is a reliable predictor of observed fear reactivity in infancy. The analysis is based on a prospective longitudinal cohort study that collected data from the first trimester and conducted observational assessments of temperament at approximately 12 months of age ( n = 281 infants)...

Childhood is a period when memory consolidation and knowledge base undergo rapid changes. The present study examined short-delay (overnight) and long-delay (after a 2-week period) consolidation of new information either congruent or incongruent with prior knowledge in typically developing 6- to 8-year-old children ( n = 32), 9- to 11-year-old children ( n = 33), and 18- to 30-year-old young adults (YA; n = 39). Both memory accessibility (cued recall of objects) and precision (precision of object placement) of initially well-learned object-scene pairs were measured...

Prenatal alcohol exposure (PAE) affects neurodevelopment in over 59 million individuals globally. Prior studies using dichotomous categorization of alcohol use and comorbid substance exposures provide limited knowledge of how prenatal alcohol specifically impacts early human neurodevelopment. In this longitudinal cohort study from Cape Town, South Africa, PAE is measured continuously-characterizing timing, dose, and drinking patterns (i.e., binge drinking). High-density electroencephalography (EEG) during a visual-evoked potential (VEP) task was collected from infants aged 8 to 52 weeks with prenatal exposure exclusively to alcohol and matched on sociodemographic factors to infants with no substance exposure in utero...

Prior theoretical and empirical research has highlighted links between positive parenting and the socioeconomic characteristics of the family's neighborhood, but has yet to illuminate the etiologic origins of this association. One possibility is that the various predictors of parenting outlined by Belsky (1984; e.g., characteristics of the child, characteristics of the parent, and contextual influences) may matter more in some neighborhood contexts than in others. To examine this possibility, we conducted etiologic moderation analyses in a sample of 1,030 families of twins (average age 8 years; 51% male, 49% female; racial composition: 82% White, 10% Black, 1% Asian, 1% Indigenous, and 6% multiracial) from the Twin Study of Behavioral and Emotional Development in Children in the Michigan State University Twin Registry...

While negative associations between behavioral inhibition/shyness and social competence are well established for children from Western cultures, the directions of these associations have been inconsistent for Chinese children, partly due to the ongoing social-cultural changes in China. Drawing from three samples of young Chinese children (born between 2009 and 2019), we aim at examining how inhibition/shyness predicts cooperative behaviors and prosocial behaviors throughout early childhood. In Study 1 ( N = 700, children aged between 36 and 72 months), mother-reported inhibition/shyness was negatively associated with mother-reported cooperative and prosocial behaviors during the preschool years...

Upon hearing a novel label, listeners tend to assume that it refers to a novel, rather than a familiar object. While this disambiguation or mutual exclusivity (ME) effect has been robustly shown across development, it is unclear what it involves. Do listeners use their pragmatic and lexical knowledge to exclude the familiar object and thus select the novel one? Or is the effect, at least in early childhood, simply based on an attraction to novelty and a direct mapping of the novel label to a novel object? In a preregistered online study with 2- to 3-year-olds ( n = 75) and adults ( n = 112), we examined (a) whether relative object novelty alone (without pragmatic or lexical information) could account for participants' disambiguation and (b) whether participants' decision processes involved reasoning by exclusion...

Adolescence is a critical developmental period that is marked by drastic changes in face recognition, which are reflected in patterns of bias (i.e., superior recognition for some individuals compared to others). Here, we evaluate how race is perceived during face recognition and whether adolescents exhibit an own-race bias (ORB). We conducted a Bayesian meta-analysis to estimate the summary effect size of the ORB across 16 unique studies (38 effect sizes) with 1,321 adolescent participants between the ages of ∼10-22 years of age...

This preregistered, longitudinal study examined how much adolescents value and integrate their parents' and peers' attitudes into their own attitudes from early to middle adolescence. Across three waves, participants ( N = 172, 91 female, 11-16 years across three waves; 439 data points) decided whether to pay money to learn their parents' or peers' attitudes about externalizing behaviors. Multivariate growth models revealed that adolescents were consistently willing to pay money over time to learn their parents' and peers' attitudes...

Children show less positivity toward gender-nonconforming (GN) than gender-conforming (GC) peers. Yet, little is known about children's reasoning about peers of varying gender expressions, including age-, gender-, and culture-related influences. We investigated how children aged 4- to 5- and 8- to 9-years-old in Hong Kong and Canada ( N = 678) reason about their moral judgments of GC and GN peers. After viewing vignettes describing GC and GN boys and girls, we asked children whether each target peer's behavior was right or wrong and why they thought so...

The aim of the study was to examine associations between life events and self-assessed loneliness in adolescence. We used data from a Norwegian population-based twin sample including seven birth cohorts ( N = 2,879, 56% females). The participants completed self-report questionnaires three times throughout adolescence, with 2 years in between (i.e., 12-18 years old at Wave 1). By using a random intercept cross-lagged panel model (RI-CLPM), we were able to separate stable influences in the measured constructs from the within-person changes at each measurement occasion...

Food insecurity poses a serious threat to children's development, but the mechanisms through which food insecurity undermines child development are far less clear. Specifically, food insecurity may influence children through its effect on parents' psychological well-being and parent-child interactions as a result, but past research on the role of parents is correlational and undermined by omitted variable bias. Using a partially rural, low-income sample of parents living in Pennsylvania ( N = 272, 90% mother, M age = 35) and their school-aged children (ages 4-11, 50% female) alongside daily measures of parent-reported food insecurity and parent and child mood and behavior, we examine how daily changes in food insecurity predict daily changes in parent and child well-being, and the extent to which food insecurity operates through parents to affect children...

Neighborhood is a key context where children learn to process social information; however, the field has largely overlooked the ways children's individual characteristics might be moderated by neighborhood effects. We examined 1,030 six- to 11-year-olds (48.7% female; 82% White) twin pairs oversampled for neighborhood disadvantage from the Twin Study of Behavioral and Emotional Development in Children. We evaluated neighbor reports ( N = 1,880) of neighborhood structural and social characteristics as moderators of genetic and environmental influences on children's social processing...

Children and even infants have clear intuitions about power early in development; they can infer who is dominant and subordinate from observing a single interaction. However, it is unclear what children infer about each individual's status from these interactions-do they think dominants and subordinates will maintain their status when interacting with novel partners? In three experiments, we investigate this question. Children (4- to 10-year-olds, N = 365) heard stories about a dominant and subordinate agent and predicted the dominant or subordinate agent's behavior with a novel agent...

Successful active learning has often been quantified with respect to either the efficiency of information search or the accuracy of subsequent recall. In this article, we explored the hypothesis that children's memory is influenced by the types of information search strategies they implement, which may emphasize different aspects of the task stimuli. As a consequence, younger children's well-documented search inefficiency may turn out to be advantageous and result in better memory for some aspects of the task...

This study examines the moment-to-moment within-person associations between maternal and child behaviors during a challenging puzzle task and compares these associations between mother-child dyads from the United States ( n = 99, 52 boys, M child age = 56.05 months, SD = 6.44) and China ( n = 101, 46 boys, M child age = 57.41 months, SD = 6.58). Maternal autonomy support and intrusive control and child agency and defeat were rated in 15-s intervals by native and bicultural coders. Country was examined as a moderator of the moment-to-moment within-person associations between maternal and child behaviors...

Behavioral inhibition (BI) is a temperamental characterized in early childhood by intense wariness and negative affect toward novelty, and is linked to children's emotional symptoms and peer problems. How children behave or respond toward diverse social contexts can influence the relation between BI and social adjustment. This study investigated the effect of children's affiliative and antagonistic behavior in cooperative and competitive contexts on the relation between early BI and social adjustment using a longitudinal design...

Jerome Kagan was a psychologist and pioneer of developmental psychology, but he was intrigued by the natural sciences and read widely across history, biography, poetry, philosophy, cross-cultural anthropology, and the humanities. Drawing on unpublished archival and other primary source material, this essay describes two of Kagan's seminal studies in child development to demonstrate how their "contexts" facilitated scientific discovery and Kagan's own development as a researcher. A subset of Kagan's archival papers-including grant materials, correspondence, personal notes, and clipped articles-are also discussed to showcase the personal and scholastic material that Kagan read, wrote, and annotated, and which further advanced his scientific thinking...

Childhood adversity can have detrimental impacts on life course mental and physical health. Timing, nature, severity, and chronicity of adversity are thought to explain much of the variability in health and developmental outcomes among exposed individuals. The current study seeks to characterize heterogeneity in adverse experiences over time at the individual, family, and neighborhood domains in a cohort of predominantly Black children (85% Black and 15% White, 46.2% girls, 67.2% free/reduced lunch in first grade), and to examine associations with mental health from sixth grade to age 26...