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As they learn to navigate the social world, children construct frameworks to interpret others' behavior. The present studies examined two such frameworks: a mentalistic framework, which construes behavior as driven by internal mental states; and a normative framework, which presumes people act in accordance with social norms. Participants included 101 children (ages 4, 7, and 10; 81% White; 41% female) and 35 adults (66% female) tested in the northeastern United States from 2019 to 2021. Children and adults utilized both mentalistic and normative frameworks to explain others' behaviors. Framework use depended on features of the behavior being explained. Minimal developmental differences were observed. The relative independence and the utility of the mentalistic and normative frameworks for naïve reasoning about behavior are considered.

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A growing body of literature has established longitudinal associations between key social cognitive capacities emerging in infancy and children's subsequent theory of mind. However, existing work is limited by modest sample sizes, narrow infant measures, and theory of mind assessments with restricted variability and generalizability. The current study aimed to extend this literature by (a) recruiting a large sample of participants (n = 116; 53 boys; 63 girls; all U.S. residents; 88 White, 8 Hispanic or Latino, 2 Black or African American, 14 two or more races/ethnicities, 4 unknown; median family income: $74-122,000), (b) examining multiple measures of infant social cognition (intentional action understanding, responding to joint attention, initiating joint attention) at Time 1 (8-12 months), and (c) using an ecologically valid theory of mind assessment designed to capture individual differences in preschoolers' mental state understanding (the Children's Social Understanding Scale; Tahiroglu et al., 2014) at Time 2 (37-45 months). Measured variable path analysis revealed a significant longitudinal association between infants' initiating joint attention and later theory of mind: infants who engaged in more attempts to initiate joint attention with experimenters through gaze alternation or gestures went on to show better parent-reported mental state understanding as preschoolers. Notably, the paths from infants' responding to joint attention and intentional action understanding to later theory of mind did not emerge as significant. These findings bolster and clarify existing claims about how mental state reasoning is rooted in foundational social-cognitive capacities emerging in infancy.

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Some work demonstrates toddlers show preferences in targets of their prosocial behavior, and a number of theorists have argued that young children become increasingly likely to direct their prosocial behavior to ingroup over outgroup targets with development. The goal of this study was to examine whether toddlers' early helping, sharing, and empathic distress were influenced by the race of the target person. Ninety-four White European American 18-month-old (17-19 months, M = 18.25, SD = .43; 55.1% male) and 24-month-old (23-25 months; M = 23.67, SD = .57; 53.1% male) toddlers took part in a series of tasks designed to assess children's instrumental helping, sharing, and empathic distress. These toddlers came from well-educated families (86.4% of mothers had a college degree and 73.8% of their partners had a college degree or more). In the study, the race of the needy target was manipulated, so that half of the children had the opportunity to respond prosocially to a White target and half had the opportunity to be prosocial to a Black target. The race of the needy experimenter influenced children's instrumental helping and emotional arousal in a feigned injury task, but did not influence their sharing behavior. Contrary to our hypothesis, though, the older toddlers expressed more empathic distress and arousal to the Black experimenter's feigned injury than to a White experimenter's feigned injury. Implications for theory and research aimed at understanding discriminatory prosocial behaviors between young children are discussed. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

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A growing body of work has documented the emergence of instrumental helping and sharing in the second year of life; however, less is known about mechanisms that underlie development and production of prosocial behavior. The current study took a longitudinal approach to explore whether the origins of prosocial behaviors can be traced back to foundational social-cognitive capacities emerging in infancy. In a sample of 90 children, longitudinal relations were examined between intention understanding and joint attention measured in infancy (8-12 months) and later instrumental helping and sharing behavior assessed in the toddler years (18-25 months). We expected social-cognitive capacities supporting infants' understanding of others to be positively related to their prosocial behaviors as toddlers. Measured variable path analyses revealed two distinct developmental pathways from infant social cognition to later prosocial behavior: 1) Instrumental helping in the toddler years was positively predicted by intention understanding in infancy; 2) sharing in the toddler years was positively predicted by infants' initiating joint attention. These results lend support to proposals on the multidimensional nature of early prosocial behavior and offer the first longitudinal evidence that the origins of toddlers' prosocial behavior can be traced to social-cognitive capacities emerging in infancy.

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Motor developmental milestones in infancy, such as the transition to self-locomotion, have cascading implications for infants' social and cognitive development. The current studies aimed to add to this literature by exploring whether and how crawling experience impacts a key social-cognitive milestone achieved in infancy: the development of intentional action understanding. Study 1 used a cross-sectional, age-held-constant design to examine whether locomotor (n = 36) and prelocomotor (n = 36) infants differ in their ability to process a failed intentional reaching action. Study 2 (n = 124) further probed this question by assessing how variability in locomotor infants' experience maps onto variability in their failed intentional action understanding. Both studies also assessed infants' tendency to engage in triadic interactions to shed light on whether self-locomotion impacts intentional action understanding directly or indirectly via changes in infants' interactions with social partners. Altogether, results showed no evidence for the role of self-locomotion in the development of intentional action understanding. Locomotor and prelocomotor infants did not differ in their failed action understanding or levels of triadic engagement (Study 1) and individual differences in days of crawling experience, propensity to crawl during play, and maximum crawling speed failed to predict infants' intentional action understanding or triadic engagement (Study 2). Explanations for these null findings and alternative influences on the development of intentional action understanding are considered.

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Infants' understanding of the intentional nature of human action develops gradually across the first year of life. A key question is what mechanisms drive changes in this foundational social-cognitive ability. The current studies explored the hypothesis that triadic interactions in which infants coordinate attention between a social partner and an object of mutual interest promote infants' developing understanding of others as intentional agents. Infants' spontaneous tendency to participate in triadic engagement was assessed in a semi-structured play session with a researcher. Intentional action understanding was assessed by evaluating infants' ability to visually predict the goal of an intentional reaching action. Study 1 (N = 88) revealed that 8- to 9-month-olds who displayed more bouts of triadic engagement showed better concurrent reasoning about the goal of an intentional reaching action. Study 2 (N = 114) confirmed these findings using a longitudinal design and demonstrated that infants who displayed more bouts of triadic engagement at 6-7 months were better at prospectively reasoning about the goal of an intentional reaching action 3 months later. Cross-lagged path analyses revealed that intentional action understanding at 6-7 months did not predict later triadic engagement, suggesting that early triadic engagement supports later intentional action processing and not the other way around. Finally, evidence from both studies revealed the unique contribution of triadic over dyadic forms of engagement. These results highlight the importance of social interaction as a developmental mechanism and suggest that infants enrich their understanding of intentionality through triadic interactions with social partners.

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