Understanding gender differences in human cognitive development may contribute to understanding the gender differences in outcomes in cognitive ageing. However, evaluation of this topic has been hindered by a lack of representative, longitudinal data from different aged cohorts measured on the same cognitive tests. Gender differences in cognitive…

This study investigated children's and adolescents' predictions regarding intergroup inclusion in contexts where peers differed on two dimensions of group membership: race and wealth. African American and European American participants (N = 153; age range: 8-14 years, M[subscript age] = 11.46 years) made predictions about whether afterschool clubs…

The problem with collaboration is that there are temptations to defect. Explicit joint commitments are designed to mitigate some of the risks, but people also feel committed to others implicitly when they both know together that they each hold the other's fate in their hands. In the current study, pairs of 3-year-old and 5-year-old children (N =…

HIV-exposed uninfected (HEU) children during the preschool and early school ages may be at-risk for neurodevelopmental challenges due to in utero and perinatal exposure to HIV and/or antiretroviral (ARV) medications. HEU children and HIV-unexposed uninfected (HUU) children from the community were recruited and tested at 3 to 4 and 5 to 6 years of…

The association between physical fitness and age-related differences in cognition and brain structure has been studied fairly extensively during development and aging, yet comparatively less in young adulthood. The current study examined 1,195 young adults aged 22 to 36 (54% female; 67% Caucasian) to better understand associations between physical…

Toddlers' understanding of object rotation was investigated using a multimethod approach. Participants were 44 toddlers between 22 and 38 months of age. In an eye-tracking task, they observed a shape that rotated and disappeared briefly behind an occluder. In an object-fitting task, they rotated wooden blocks and fit them through apertures.…

This study examined whether adolescents' social aggression is socialized through exposure to peers' socially aggressive text messaging. Using data on the socially aggressive content of text messages that 221 participants (M[subscript age] = 15.02 years; 46.7% female) sent to and received from peers, and teacher ratings of participants' in-person…

Do patterns of intimate relationship development foreshadow whether couples' unions stay together or end in separation? Integrating tenets from the enduring dynamics and emergent distress models of relationship development, we propose an accumulating distress model suggesting that the trajectories of those in dissolving partnerships (i.e., unions…

Understanding when children develop a sense of group boundaries has implications for conflict and its resolution. Integrating social identity development theory and the developmental peace-building model, we investigated whether preferences for ethno-religious ingroup symbols mediate the link from child age to outgroup prosocial giving among 5- to…

It is well established that deictic gestures, especially pointing, play an important role in children's language development. However, recent evidence suggests that other types of deictic gestures, specifically show and give gestures, emerge before pointing and are associated with later pointing. In the present study, we examined the development…

Accidents caused by human errors illustrate the fragility of cognitive processing and its coordination by executive functions against stress. To better understand how core executive functions change over time, influence each other, and are affected by chronic stress exposure, a prospective cohort study was conducted from 2016 to 2019. Five hundred…

Interpreting iconic gestures can be challenging for children. Here, we explore the features and functions of iconic gestures that make them more challenging for young children to interpret than instrumental actions. In Study 1, we show that 2.5-year-olds are able to glean size information from handshape in a simple gesture, although their…

The current study examined whether racially minoritized children and racial majority children demonstrate different race-based learning preferences and whether the racial demographics of their schools and neighborhoods predict these preferences. Race-based information endorsement and teacher preferences of Black and White 3- to 7-year-old children…

Children's drawings of common object categories become dramatically more recognizable across childhood. What are the major factors that drive developmental changes in children's drawings? To what degree are children's drawings a product of their changing internal category representations versus limited by their visuomotor abilities or their…

We examined the development of numerical magnitude representations of fractions and decimals from fourth to 12th grade. In Experiment 1, we assessed the rational number magnitude knowledge of 200 Chinese fourth, fifth, sixth, eighth, and 12th graders (92 girls and 108 boys) by presenting fraction and decimal magnitude comparison tasks as well as…