From the earliest moments in their lives, infants begin to build memories about their past and accumulate knowledge about the world. In this article, we focus on the distinction between memory for events and memory for information, and the ongoing debate about which type of memory provides the foundation for the development of the other. Some researchers argue that specific memory developmentally precedes general memory, whereas others support the opposite position. Our literature review suggests that the latter position is inconsistent with many empirical findings and theoretical principles of memory captured by computational models capable of accounting for these findings. We propose that mnemonic acuity could be a starting point for memory development, and that it can support both specific and generalized memories.

Many young people are inclined toward risk taking and also toward helping other people. is a term that can describe different ways that youth provide significant instrumental and emotional support to family members, friends, and strangers, even when it involves a personal risk. In this article, we review research about different types of prosocial risk taking and highlight examples, emphasizing a developmental perspective by examining change across childhood, adolescence, and young adulthood. Research to date suggests that young people are more likely to engage in prosocial risk taking when they are more tolerant of uncertainty, have greater sensation-seeking, perspective-taking, and empathy, and when they are motivated by reputational concerns. Individual differences in prosocial risk-taking behavior depend on youth's access to opportunities to explore, practice, and experience positive social feedback. Providing opportunities for youth to direct their risk-taking tendencies toward prosocial outlets may help minimize risks to their psychosocial health and promote individual and community well-being.

A robust literature is developing around how the stress of discrimination is implicated in individual- and group-level sleep disturbances, and how these disturbances contribute to the development of population-level sleep disparities over time. Although discrimination can be based on many individual and intersecting biases, like gender, sexuality, socioeconomic status, and education, in this article, we focus on discrimination rooted in ethnicity and race because of the well-founded documentation of disparities in sleep by race. Focusing primarily on adolescence and young adulthood, we integrate research linking ethnic and racial discrimination to sleep across a variety of methods and developmental time spans, ending with reflections on interventions. In so doing, we seek to advance research and encourage conversations that cross-fertilize collaborations between those with interests in discrimination, sleep, and population-level health equity.

The sharp rise over the past decade in young children's access to various forms of screen media (e.g., smartphones, tablets, TVs) has posed new and significant challenges to caregivers in managing children's use of this type of media. For caregivers of young children with externalizing behavior problems, managing children's time with screen media is especially important and challenging. In this article, we summarize evidence of bidirectional links between early externalizing behavior problems and unhealthy screen media use in young children and discuss the extent to which prior interventions have responded to the needs of caregivers of children with these problems. We propose a conceptual model for an intervention to promote healthy screen media use for children with externalizing behavior problems that leverages current behavioral parenting interventions.

Most children first enter social groups of peers in preschool. In this context, children use movement as a social tool, resulting in distinctive proximity patterns in space and synchrony with others over time. However, the social implications of children's movements with peers in space and time are difficult to determine due to the difficulty of acquiring reliable data during natural interactions. In this article, we review research demonstrating that proximity and synchrony are important indicators of affiliation among preschoolers and highlight challenges in this line of research. We then argue for the advantages of using wearable sensor technology and machine learning analytics to quantify social movement. This technological and analytical advancement provides an unprecedented view of complex social interactions among preschoolers in natural settings, and can help integrate young children's movements with others in space and time into a coherent interaction framework.

It is well established that parent-child dyadic synchrony (e.g., mutual emotions, behaviors) can support development across cognitive and socioemotional domains. The advent of simultaneous two-brain allows further insight into dyadic . In this article, we review 16 recent studies of naturalistic, parent-child brain-to-brain synchrony, finding relations with the nature of interactions (collaborative versus competitive, parent versus stranger), proximal social cues (gaze, affect, touch, reciprocity), child-level variables (irritability, self-regulation), and environmental factors (parental stress, family cohesion, adversity). We then discuss how neural synchrony may provide a biological mechanism for refining broader theories on developmental benefits of dyadic synchrony. We also highlight critical areas for future study, including examining synchrony trajectories longitudinally, including more diverse participants and interaction contexts, and studying caregivers beyond mothers (e.g., other family members, teachers). We conclude that neural synchrony is an exciting and important window into understanding how caregiver-child dyadic synchrony supports children's social and cognitive development.

Loneliness becomes more prevalent as youth transition from childhood into adolescence. A key underlying process may be the puberty-related increase in biological stress reactivity, which can alter social behavior and elicit conflict or social withdrawal ("fight-or-flight" behaviors) in some youth, but increased prosocial ("tend-and-befriend") responses in others. We propose an integrative theoretical model that identifies the social, personality, and biological characteristics underlying individual differences in social-behavioral responses to stress. This model posits a vicious cycle whereby youth who respond to stress with "fight-or-flight" tendencies develop increasing and chronic levels of loneliness across adolescence, whereas youth who display "tend-and-befriend" behaviors may be buffered from these consequences. Based on research supporting this model, we propose multiple intervention avenues for curtailing the prevalence of loneliness in adolescence by targeting key factors involved in its development: social relationships, personality, and stress-induced behavioral and biological changes.

In this article, we suggest that aging and development are two sides of the same coin, and that developing a comprehensive understanding of health and disease risk requires examining age-related processes occurring throughout the earliest years of life. Compared to other periods in life, during this early period of acute vulnerability, when children's biological and regulatory systems are developing, biological aging occurs most rapidly. We review theory and empirical research suggesting that processes of development and aging are intricately linked, and that early adversity may program biological parameters for accelerated aging and disease risk early in life, even though clinical signs of age-related disease onset may not be evident until many years later. Following from this, we make the case for widespread incorporation of biological aging constructs into child development research.

Parent self-regulation is multifaceted, involving emotional, cognitive, and biological processes that support or constrain parenting behavior. It is highly relevant to disciplinary contexts in which parents' regulatory difficulties can contribute to harsh discipline, which is linked to children's maladjustment. In this article, we address why parents' self-regulation is an essential focus for basic and applied research on parental discipline. We emphasize the need to 1) incorporate and test multiple domains of parent self-regulation to understand their respective and interactive contributions and 2) understand how parent self-regulation interfaces with parent-child coregulation in delineating mechanistic pathways of the effects of harsh discipline on children's adjustment. These foci will more fully inform the etiology of children's maladjustment related to harsh discipline and knowledge regarding specific, malleable intervention targets aimed at reducing harsh discipline.

Vicarious exposure to discrimination can result in multiple negative outcomes in youth. In this article, we offer a conceptual model that articulates the intersecting contextual factors and potential moderators for U.S. Latine youth's exposure to family-level vicarious racism, and explore how that affects youth and family responses. We define and describe youth's exposure to family-level vicarious racism, considering the ramifications of these experiences through family processes and cultural values. We conclude by arguing that research on discrimination and racism in Latine families needs to account for family-level processes.

Although evidence of heritability for autism spectrum disorder (ASD) is strong, studies of twin pairs suggest that at least some portion of the etiology is attributable to environmental factors, either directly or through interaction with genes. Given the multitude of environmental and psychosocial exposures that have been reported to increase atypical neurodevelopment in offspring, in this article, we summarize what prenatal air pollutant, chemical, and occupational exposures and psychosocial stressors have been reportedly associated with ASD and co-occurring neurodevelopmental disorders. We highlight consistencies in reported associations and recommend areas for research to close gaps in our understanding of environmental risk for ASD. Because this issue is of particular importance in historically marginalized communities and low- and middle-income countries, we also discuss the importance of environmental justice issues and exposure disparities in research, and we advocate for prioritizing policies to reduce disparities and improve service provision in vulnerable populations.

Sleep is a robust predictor of child and adolescent development. Race/ethnicity, socioeconomic status (SES), and related experiences (e.g., discrimination) are associated with sleep, but researchers have just begun to understand the role of sleep in the development of racial/ethnic and SES disparities in broader psychosocial adjustment and cognitive functioning during childhood and adolescence. In this article, we discuss poor sleep as a potential mechanism contributing to the development of such disparities, and better sleep as a potential protective factor that diminishes such disparities. We conclude by offering recommendations for research to advance understanding of sleep as a key bioregulatory system that may underlie or protect against detrimental developmental outcomes related to socioeconomic adversity and belonging to a historically minoritized group.

Parents' executive functions (EFs), or cognitive skills facilitating thought and behavior management, are meaningful correlates of parenting behavior. EFs are theorized to support parents in inhibiting reactive responses, managing information during parent-child interactions, and adapting to novel developmental demands. Less effective EFs associate with risk for harsh parenting and physical abuse, underscoring the importance of research on parental EFs in promoting healthy child development. Yet, despite the strong theory, findings are mixed and reveal only modest effect sizes in relations between EFs and parenting. One explanation may be a lack of ecological validity in measuring parental EFs. Traditional measures of adult EFs have been used, but these are decontextualized and do not reflect the cognitively and emotionally demanding nature of parenting. In this article, we argue that new and adapted measures are needed. We discuss the role of EFs in parenting, review measurement, and offer suggestions for improvements in ecological validity.

Over the last 20 years, we have learned much about the extent to which early-life deprivation affects the mental health of children and adolescents. This body of evidence comes predominantly from studies of children raised in institutional care. The Bucharest Early Intervention Project (BEIP) is the only randomized controlled trial designed to evaluate whether the transition to family-based foster care early in development can ameliorate the long-term impact of institutional deprivation on psychopathology during vulnerable developmental windows such as adolescence. In this review, we detail the extent to which early deprivation affects mental health during this period, the capacity of family-based care to facilitate recovery from early deprivation, and the mechanisms underpinning these effects spanning social-emotional, cognitive, stress, and neurobiological domains. We end by discussing the implications and directions for the BEIP and other studies of youth raised in institutions.

How does language shape mathematical development? In this article, we consider this question by reviewing findings from cross-sectional and longitudinal research. In this literature, we find that differences in the structures of languages and individual variation in language ability are associated with mathematical performance in both obvious and unexpected ways. We then consider the causal nature of these relations, with a focus on experimental studies that have tested the effects of language instruction on mathematical outcomes. Findings from this work show that certain forms of language instruction meaningfully improve performance in several mathematical domains, providing strong evidence of a linguistic pathway in mathematical development. However, much additional research is needed to understand how language instruction may be integrated optimally into math education. We conclude with recommendations for research.

A remarkable amount of perceptual development occurs in the first year after birth. In this article, we spotlight the case of color perception. We outline how within just 6 months, infants go from very limited detection of color as newborns to a more sophisticated perception of color that enables them to make sense of objects and the world around them. We summarize the evidence that by 6 months, infants can perceive the dimensions of color and categorize it, and have at least rudimentary mechanisms to keep color perceptually constant despite variation in illumination. In addition, infants' sensitivity to color relates to statistical regularities of color in natural scenes. We illustrate the contribution of these findings to understanding the development of perceptual skills such as discrimination, categorization, and constancy. We also discuss the relevance of the findings for broader questions about perceptual development and identify directions for research.

In the United States, the long-term effects of early childhood programs have been given particular weight in research on early childhood education and in policy debates about the value of prekindergarten. Many research teams were building the evidence base on U.S. early childhood programs to inform that discussion when studies were upended by the COVID-19 pandemic. In this article, we describe the theoretical and practical the COVID-19 pandemic poses for longitudinal studies of preschool intervention programs. We also discuss the potential the crisis offers by introducing new variation in postprogram experiences for addressing new questions. The article intersects the resilience and disaster literatures with theoretical frameworks for the persistence of preschool effects. We conclude with recommendations for how longitudinal studies of cohorts affected by COVID-19 can enhance our understanding of the mechanisms behind the persistence of preschool effects.

Neglect is the most prevalent form of maltreatment, but it has been understudied relative to abuse. Additionally, developmental outcomes associated with early maternal withdrawal have been understudied relative to outcomes associated with harsh treatment. However, a large body of studies on rodents has documented the causal effect of low maternal care on altered stress responses in offspring. Other evidence from human studies links early maternal withdrawal to clinical levels of neglect. Studies of both rodents and humans suggest that, rather than the aversive responses (e.g., fight, flight, freeze) modeled in relation to threat of attack or harsh treatment, early maternal withdrawal is associated with increased calling and contact seeking to mothers. Moreover, two longitudinal studies indicate that early maternal withdrawal, but not negative-intrusive interaction, contributes to adolescent borderline psychopathology. The field needs prospective studies with well-operationalized constructs of maternal withdrawal to delineate the distinct developmental pathways that may be associated with neglect.

Developmental change emerges from dynamic interactions among networks of neural activity, behavior systems, and experience-dependent processes. A developmental cascades framework captures the sequential, multilevel, cross-domain nature of human development and is ideal for demonstrating how interconnected systems have far-reaching effects in typical and atypical development. Neurodevelopmental disorders represent an intriguing application of this framework. Autism spectrum disorder (ASD) is complex and heterogeneous, with biological and behavioral features that cut across multiple developmental domains, including those that are motor, cognitive, sensory, and bioregulatory. Mapping developmental cascades in ASD can be transformational in elucidating how seemingly unrelated behaviors (e.g., those emerging at different points in development and occurring in multiple domains) are part of an interconnected neurodevelopmental pathway. In this article, we review evidence for specific developmental cascades implicated in ASD and suggest that theoretical and empirical advances in etiology and change mechanisms can be accelerated using a developmental cascades framework.

Spoken language outcomes after cochlear implantation are highly variable. Some variance can be attributed to individual characteristics. Research with typically hearing children suggests that the amount of language directed to children may also play a role. However, several moderating factors may complicate the association between language input and language outcomes in children with cochlear implants. In this article, I present a conceptual framework that posits that the association between total language input directed to children and language outcomes is moderated by factors that influence what is accessible, attended to, and coordinated with the child. The framework also posits that children with cochlear implants exhibit more variability on those moderating factors, which explains why the relation between language input and language outcomes may be more complex even if language input is more important for successful language outcomes in this population.

Accumulating information and knowledge is a major task of development. A common assumption is that we build our storehouse of world knowledge, our semantic memory, through direct experience. Although direct experience is involved, to explain fully how we know all that we know, we also must consider processes that allow for integration of information learned in separate yet related episodes of direct learning, as well as inferential processes that operate over integrated representations and permit productive extension of knowledge. In this article, I describe the self-derivation through integration paradigm my colleagues and I developed to model these processes. Using this paradigm, we charted individual and developmental variability throughout childhood and in young adults. Several findings support the contention that the self-derivation through integration paradigm provides a valid model for how we build semantic knowledge, including the observations that performance on the task correlates with and predicts individuals' world knowledge and academic success.

Recent research has suggested that the pubertal period provides an opportunity for recalibrating the stress-responsive systems in youth whose responses to stress have been altered by early adversity. Such recalibration may have cascading effects that affect brain and behavioral development. In this article, we consider a large, cross-species literature to demonstrate the potential importance of pubertal stress recalibration for understanding the development of psychopathology following early deprivation by caregivers. We review the evidence for recalibration of the hypothalamic-pituitary-adrenal axis in humans, examine research on rodents that has established mechanisms through which stress hormones affect brain structure and function, and summarize the literature on human neuroimaging to assess how these mechanisms may translate into changes in human behavior. Finally, we suggest ideas for elucidating the consequences of pubertal stress recalibration that will improve our understanding of adaptive and maladaptive adolescent behavior following early adversity.

There are notable risks associated with alcohol, cigarette, and marijuana use during adolescence. Yet, there is no single cause for adolescent substance use. The etiology of substance use is known to develop over time, across multiple levels of influence. Informed by developmental perspectives, this review aims to provide an overview of biological (e.g., genetic, neuroimaging), individual (e.g., temperament, behavior problems), and social (e.g., parents, peers) factors that increase risk for and protection against this multifaceted phenomenon. Additionally, emerging areas of research are highlighted, as well as preliminary work examining the etiology of adolescent substance use across multiple levels of influence. Understanding early factors associated with the emergence of adolescent substance use can help inform prevention programming to reduce subsequent cognitive impairments and psychopathology. Adaptive individualized interventions addressing various domains linked to adolescent substance use in real-time are likely to have significant utility given the numerous pathways to adolescent substance use.

Having sensitive, contingent, and supportive social relationships has been linked to more positive outcomes after experiences of early childhood adversity. Traditionally, social relationships are construed as moderators that buffer children from the effects of exposure to adverse events. However, recent data support an alternative view: that supportive social relationships influence children's later outcomes by shaping their perceptions of safety and stress, regardless of the particular events to which children are exposed. This perspective has implications for understanding vulnerability and resilience in children.

In this article, we provide definitional clarity for the construct of social withdrawal as it was originally construed, and review the original theoretical and conceptual bases that led to the first research program dedicated to the developmental study of social withdrawal (the Waterloo Longitudinal Project). We also describe correlates (e.g., social and social-cognitive incompetence), precursors (e.g., dispositional characteristics, parenting, insecure attachment), and consequences (e.g., peer rejection and victimization, negative self-regard, anxiety) of social withdrawal, and discuss how the study of this type of withdrawal led to a novel intervention that targets risk factors that predict social withdrawal and its negative consequences.

The possibility and nature of bilingual advantage for theory of mind (ToM), that is, young bilingual children outperforming their monolingual peers, have been discussed increasingly since the first research on the topic was published in 2003. Because accumulating evidence demonstrates a ToM advantage for bilingual individuals, in this article, we focus on how this advantage arises. We consider how current theoretical positions, including executive function, metalinguistic awareness, and sociolinguistic awareness accounts, explain such an advantage in young bilingual children. These theoretical accounts receive some, but only partial, support, so further research and theory are needed to understand comprehensively the relationship between bilingualism and ToM.

Ever since the birth of the first baby born through in vitro fertilization in 1978, advances in reproductive technologies have raised new concerns about the outcomes for children. In this article, I summarize research on children born through assisted reproduction involving a third party, that is, children born through egg donation, sperm donation, and surrogacy, with particular attention to the findings of a longitudinal study of children born to heterosexual couples in the United Kingdom. The assisted reproduction families generally showed high levels of family functioning and children's adjustment from early childhood through to adolescence, suggesting that biological relatedness is less important than positive parent-child relationships for the well-being of children conceived by third-party assisted reproduction. Similarly, studies of families created by third-party reproduction with two mothers, single mothers, two fathers, and single fathers have shown that these families function well.

Participants in longitudinal studies that followed children into adulthood now have children of their own, which has enabled researchers to establish multiple-generation cohorts. In this article, I illustrate the benefits of multiple-generation cohort studies for developmental researchers, including: (a) the impact of child and adolescent characteristics (i.e., preconception factors) on parenthood can be studied from a developmental perspective and without having to rely on retrospective reports, (b) intergenerational continuity and transmission can be examined for psychological, behavioral, and social development, and by comparing parent and offspring generations for the same developmental period, and (c) the interplay of genetic and environmental influences on parenting and child development can be disentangled. Even though multiple-generation studies pose unique logistical and methodological challenges, such cohorts are indispensable for rigorous research into parenting and the origins of child development.

Toddlers vary widely in the rate at which they develop vocabulary. This variation predicts later language development and school success at the group level; however, we cannot determine which children with slower vocabulary development in the second year will continue to have difficulty. In this article, I argue that this is because we lack theoretical understanding of how multiple processes operate as a system to create individual children's pathways to word learning. I discuss the difficulties children face when learning even a single concrete noun, the multiple general cognitive processes that support word learning, and some evidence of rapid development in the second year. I present work toward a formal model of the word learning system and how this system changes over time. The long-term goal of this work is to understand how individual children's strengths and weaknesses create unique vocabulary pathways that enable us to predict outcomes and identify effective interventions.

Infancy is a sensitive developmental period that presents both opportunities and challenges for caregivers to feed their infants in ways that support healthy growth and development. The capacity to eat in a way that supports energy (caloric) intake aligned with the body's physiologic need for growth and development appear to diminish in the years following infancy, but the reasons for this and whether this is developmentally typical are unclear. Feeding interactions that undermine infants' ability to regulate their intake in response to hunger and satiety are thought to confer risk for obesity in infancy and beyond. In this integrative review, we consider what we know about the emergence of self-regulation of behavior and emotion from both a behavioral and a physiological perspective. Then, we apply this information to our emerging understanding of how self-regulation of energy intake may be derailed through feeding interactions between caregivers and infants.