The persistent sampling bias in developmental psychology: A call to action

Contagious Crying Revisited: A Cross-Cultural Investigation Into Infant Emotion Contagion Using Infrared Thermal Imaging

Contagious crying in infants has been considered an early marker of their sensitivity to others' emotions, a form of emotional contagion, and an early basis for empathy. However, it remains unclear whether infant distress in response to peer distress is due to the emotional content of crying or acoustically aversive properties of crying. Additionally, research remains severely biased towards samples from Europe and North America. In this study, we address both aspects by employing the novel and non-invasive method of infrared thermal imaging, in combination with behavioural markers of emotional contagion, to measure emotional arousal during a contagious crying paradigm in a cross-cultural sample of 10- to 11-month-old infants from rural and urban Uganda and the United Kingdom (N = 313). Infants heard social stimuli of positive, negative, and neutral emotional valence (infant laughing, crying, and babbling, respectively) and a non-social, acoustically matched artificial aversive sound. Results revealed that overall changes (as opposed to positive or negative) in infant nasal temperature were larger in response to crying and laughing compared to the artificial aversive sound and larger for crying than for babbling. Infants showed stronger behavioural responses for crying than for the artificial stimulus, as well as for crying than for laughing. Overall, our results support the view that infants within the first year of life experience emotional contagion in response to peer distress, an effect that is not just explained by the aversive nature of the stimuli. Sensitivity to others' emotional signals in the first year of life may provide the core building blocks for empathy.

Diversity in research on the psychology of language: A large-scale examination of sampling bias

The human capacity for language cannot be fully understood without appreciation of its ability to adapt to startling diversity. Narrow sampling therefore undermines the psycholinguistic enterprise. Concerns regarding a lack of sample diversity in psycholinguistics are increasingly being raised, but large-scale data on the state of the field remain absent. In the current paper, we address this empirical gap by documenting sample diversity in over 5500 psycholinguistic studies published over two decades. Moreover, we consider several hitherto unexplored issues regarding diversity in (psycho)linguistics, including the impact of sample biases on knowledge uptake and the implementation of diversification strategies often proposed in the literature. We identify marked overrepresentations in the data - of English, North America, and tertiary education students - and provide new evidence of their consequences, where papers on more commonly studied languages and locations tend to be cited more. We also demonstrate that absolute diversity has increased over time, albeit insufficiently to disrupt the linguistic and geographic concentrations observed. We find that representation of Global South researchers and contexts has grown, but this growth is centered in a handful of countries (China, Israel), and Africa and Southeast Asia remain severely underrepresented. Regarding the implementation of diversification strategies, we show that online data collection has yet to contribute much to diversification, while cross-national collaboration is effective in this respect. Finally, we challenge prevalent conceptions of diversification in which "exotic" languages spoken in remote locations assume a central role by highlighting the neglected linguistic diversity of the major hubs of psycholinguistic knowledge production.

Revisiting the Object-Processing Paradigm in the Study of Gaze Cues: What Two Decades of Research Have Taught Us About Infant Social Learning

Infants are highly sensitive to social stimuli from early on in ontogeny. Social cues, including others' gaze, not only capture and guide infants' attention, but also modulate the efficiency in which the infant (brain) encodes and recognizes information. Over the last two decades, the novelty preference based object-processing paradigm has been instrumental in investigating this phenomenon experimentally. This paper offers a comprehensive review and critical evaluation of methodological aspects and empirical findings from previous research using this paradigm to study the influence of (non-)social cues on infants' object processing. We highlight the critical role of methodological details and discuss influential factors such as eye contact, infants' object-directed attention, naturalistic environments, and potential neural correlates associated with enhanced object encoding. A comprehensive review table summarizes key methodological details from previous studies to assist researchers in making informed decisions when designing future studies. We conclude that the object-processing paradigm has proven to be an effective method with high potential for future research disentangling the influence of fine-grained factors on infants' object memory.

Great ape infants' face touching and its role in social engagement

Touch has a key role in the social development of infant primates and in the regulation of social interactions, even so, there's a rarity of studies on infants' use of social touch. In this work, we document chimpanzee infants and human infants' touching of other's faces, a behavior already described in wild capuchin monkey infants, and investigate possible functions of infants' social touch. A strength of this study is that we sampled chimpanzee and human infants from three different social ecologies each. Each infant was observed naturalistically, in their everyday environments. In 36 h of observation, we found 269 touch events, specifically 222 face touches and 47 head touches. We found significant differences between groups, within species. Face touching occurred preferentially with adult females in all groups, and preferentially in prosocial contexts, although the most preferred contexts differed across groups. A unifying concept was that almost all infant face touching occurred during joint attention events. We interpret this as the ability of 1-year-olds to use face touching as a behavioral marker of mutual engagement during bouts of triadic connectedness, that is when they engage together with a social partner about an object or an event. In this study, we document an understudied behavior of young chimpanzees and humans, one that is not only part of prosocial interactions, but one that may function to highlight infants' active role in engagement with another, while they together engage in triadic connectedness.

Multimodal Assessment of Adolescent Coping with Family Conflict Incorporating Video-Mediated Recall Methodology

The strategies adolescents use to cope with stress are key determinants of psychological adjustment. Research has most often utilized questionnaire methods to assess coping, which can be limited by recall bias and broad time frames. This study used a novel application of video-mediated recall methodology to assess adolescent coping during discussion of a family conflict. We examined associations between coping, observed emotions and behavior, and internalizing and externalizing symptoms. Caregiver-adolescent dyads (N = 89; ages 10 to 15) completed questionnaires on adolescent coping, family conflict, and symptoms of psychopathology. Caregiver-adolescent dyads were videorecorded during a 10-min conflict task. Adolescents then participated in a video-mediated recall procedure to self-report their use of coping strategies while reviewing segments of the conflict task. In addition, video recordings were coded for adolescent emotions and behaviors. Bivariate correlations revealed modest correspondence between questionnaire and recalled reports of in-the-moment adolescent coping strategies. In-the-moment coping was associated with observed and reported emotional and behavioral problems across strategies. In multivariate analyses, questionnaire reports of coping were significantly associated with questionnaire reports of internalizing and externalizing psychopathology, while in-the-moment coping responses were uniquely associated with observed emotions and behaviors. Differences in questionnaire and laboratory measures of coping underscore the need for comprehensive assessment to capture the complexity of coping in adolescence and their unique influence on emotions and behaviors and suggest that questionnaire measures may be sufficient to understand associations with global reports of symptoms. The conceptual, methodological, and clinical implications of the present study are discussed.

A year in stuttering research: A systematic review of global representation and sociodemographic reporting practices in English-language journals in 2020

PURPOSE

Demographic data is inconsistently reported and defined in communication sciences and disorders research, yet gender, ethnicity, and socioeconomic status (SES) may be critical considerations for investigations of stuttering. Therefore, the purpose of this study is to evaluate the global scope and sociodemographic reporting practices among stuttering research published in the year 2020.

METHODS

Article searches were conducted in February 2023 in PsycINFO, PubMed, and ASHAWire for studies sampling participants with developmental stuttering or cluttering. Further inclusion criteria for systematic review were that articles must: (a) be published in the year 2020, (b) be published in a peer-reviewed journal, and (c) present original empirical research. Participant gender, ethnicity, and SES were extracted via a manualized coding scheme.

RESULTS

The total corpus for review included k = 92 articles, representing a total n = 7,342 participants recruited from 26 different countries. The majority of articles (k = 36) were based in the United States (US), with all other countries contributing between 1 and 5 articles each. Gender (or sex) was reported in 93.5% of included studies, ethnicity in 22.8%, and SES in 41.3%. Reporting practices did not significantly differ between US and non-US countries. Of note, only one article in 2020 recruited participants who clutter, with all others recruiting participants who stutter.

CONCLUSION

This is the first systematic review of diversity and reporting practices in the global stuttering research literature. Our results revealed a narrow global distribution of research participants, with limited reporting and analyses regarding participant ethnicity or SES. Consequently, we have identified opportunities to improve research participant transparency and to further consider sociocultural variables toward the advancement of global and inclusive stuttering research.

Cognitive and affective processes in children's third-party punishment

This study investigated how children's punishment affective states change over time, as well as when children begin to prioritise intentions over outcomes in their punishment decisions. Whereas most prior research sampled children from Anglo-America or Northwestern Europe, we tested 5- to 11-year-old children from Colombia and Spain (N = 123). We focused on punishment behaviour in response to ostensibly real moral transgressions, rather than punishment recommendations for hypothetical moral transgressions. We employed moral scenarios involving disloyalty (group-focused moral domain) and unfairness (individual-focused moral domain). Regarding punishment affective states, on average, children did not derive much enjoyment from administering punishment, nor did they anticipate that punishment would feel good. Thus, children did not make the same emotional forecasting error adults commonly commit. Regarding the cognitive integration of outcomes and intentions, children began to punish failed intentional transgressions more harshly than accidental transgression, in both disloyalty and unfairness scenarios, much earlier than in previous behavioural studies: around 7 years of age rather than in late adolescence. This could be due to the lower processing demands and higher intention salience of our paradigm. Exploratory analyses revealed that children showed higher concern for disloyalty than unfairness. Punishment of disloyalty remained relatively stable in severity with increasing age, while punishment of unfairness decreased in severity. This suggests that the relative importance of moral concerns for the individual vs. the group may shift because of culture-directed learning processes.

Modality-level obstacles and initiatives to improve representation in fetal, infant, and toddler neuroimaging research samples

Fetal, infant, and toddler (FIT) neuroimaging researchers study early brain development to gain insights into neurodevelopmental processes and identify early markers of neurobiological vulnerabilities to target for intervention. However, the field has historically excluded people from global majority countries and from marginalized communities in FIT neuroimaging research. Inclusive and representative samples are essential for generalizing findings across neuroimaging modalities, such as magnetic resonance imaging, magnetoencephalography, electroencephalography, functional near-infrared spectroscopy, and cranial ultrasonography. These FIT neuroimaging techniques pose unique and overlapping challenges to equitable representation in research through sampling bias, technical constraints, limited accessibility, and insufficient resources. The present article adds to the conversation around the need to improve inclusivity by highlighting modality-specific historical and current obstacles and ongoing initiatives. We conclude by discussing tangible solutions that transcend individual modalities, ultimately providing recommendations to promote equitable FIT neuroscience.

A normative database of Swahili-Chinese paired associates

Over the past few decades, Swahili-English and Lithuanian-English word pair databases have been extensively utilized in research on learning and memory. However, these normative databases are specifically designed for generating study stimuli in learning and memory research involving native (or fluent) English speakers. Consequently, they are not suitable for investigations that encompass populations whose first language is not English, such as Chinese individuals. Notably, native Chinese speakers constitute a substantial proportion, approximately 18%, of the global population. The current study aims to establish a new database of translation equivalences, specifically tailored to facilitate research on learning, memory, and metacognition among the Chinese population. We present a comprehensive set of normative measures for 200 Swahili-Chinese paired associates, including recall accuracy, recall latency, error patterns, confidence ratings, perceived learning difficulty, judgments of learning, and perceived learning interestingness for the entire word pairs. Additionally, we include word-likeness ratings and word length for the Swahili words, and concreteness ratings, familiarity ratings, word frequency, and number of strokes for the Chinese words. This diverse array of measures, gathered across a substantial number of Swahili-Chinese word pairs, is poised to effectively support future research seeking to investigate the intricate processes of learning, memory and metacognition within the Chinese population.

Understanding a Third-Party Communicative Situation in Korean-Learning Infants

The present study tested 14-month-old monolingual infants (N = 64, 52% female, 75% Korean, and 25% American) in a looking-time task adapted from previous referent identification research. In three experiments, Korean-learning infants watched a speaker, who could only see one of two identical balls, ask a recipient, "gong jom jul-lae?" ("Will you give me Ø ball?" because Korean lacks an article system). They expected the recipient to reach for the ball visible to the speaker, but not the one hidden from her, only when the speaker was introduced separately to facilitate perspective-taking. Korean infants were also found to hold these expectations when the speaker said, "jeo gong jom jul-lae?" ("Will you give me that ball?"), presumably because the added demonstrative "jeo" rendered the speech more informative. A group of American English-learning infants performed similarly, but not as robustly as did their Korean peers, when the speaker requested "Give me that ball." These findings shed new light on how infants use their emergent perspective-taking and language skills to interpret a speaker's intended referent and expand the previous focus on English-learning infants.

Thinking about thinking: A longitudinal investigation linking developments in metacognition, inhibitory control, and theory of mind

This longitudinal study tracked the developmental relations linking metacognition, theory of mind, and inhibitory control in 52 children across a 1.5-year interval, beginning at 3 or 4 years of age. Metacognition and inhibitory control emerged before theory of mind and predicted subsequent theory of mind competence. Moreover, there was evidence of developmental mediation, whereby metacognition predicted inhibitory control, which predicted theory of mind. We suggest that metacognitive self-reflection may provide the "developmental enrichment" necessary to think about thinking, and when inhibitory control is sufficiently developed this thinking can be extended to complex reasoning about own and other minds.

Infants' Social Evaluation of Helpers and Hinderers: A Large-Scale, Multi-Lab, Coordinated Replication Study

Evaluating whether someone's behavior is praiseworthy or blameworthy is a fundamental human trait. A seminal study by Hamlin and colleagues in 2007 suggested that the ability to form social evaluations based on third-party interactions emerges within the first year of life: infants preferred a character who helped, over hindered, another who tried but failed to climb a hill. This sparked a new line of inquiry into the origins of social evaluations; however, replication attempts have yielded mixed results. We present a preregistered, multi-laboratory, standardized study aimed at replicating infants' preference for Helpers over Hinderers. We intended to (1) provide a precise estimate of the effect size of infants' preference for Helpers over Hinderers, and (2) determine the degree to which preferences are based on social information. Using the ManyBabies framework for big team-based science, we tested 1018 infants (567 included, 5.5-10.5 months) from 37 labs across five continents. Overall, 49.34% of infants preferred Helpers over Hinderers in the social condition, and 55.85% preferred characters who pushed up, versus down, an inanimate object in the nonsocial condition; neither proportion differed from chance or from each other. This study provides evidence against infants' prosocial preferences in the hill paradigm, suggesting the effect size is weaker, absent, and/or develops later than previously estimated. As the first of its kind, this study serves as a proof-of-concept for using active behavioral measures (e.g., manual choice) in large-scale, multi-lab projects studying infants.

Challenging the "norm": a critical look at deaf-hearing comparison studies in research

This study critically examines the biases and methodological shortcomings in studies comparing deaf and hearing populations, demonstrating their implications for both the reliability and ethics of research in deaf education. Upon reviewing the 20 most-cited deaf-hearing comparison studies, we identified recurring fallacies such as the presumption of hearing ideological biases, the use of heterogeneously small samples, and the misinterpretation of critical variables. Our research reveals a propensity to biased conclusions based on the norms of white, hearing, monolingual English speakers. This dependence upholds eugenics ideas and scientific ableism, which reinforces current power dynamics that marginalize the epistemologies and lived experiences of deaf populations. Going forward, it will be imperative for deaf people to be included in meaningful roles in deaf-related research as active contributors who help define the whole research process. Without this shift, the research risks remaining detached from the very populations it seeks to understand.

Maternal parenting style and self-regulatory private speech content use in preschool children

Private speech is a tool through which children self-regulate. The regulatory content of children's overt private speech is associated with response to task difficulty and task performance. Parenting is proposed to play a role in the development of private speech as co-regulatory interactions become represented by the child as private speech to regulate thinking and behaviour. This study investigated the relationship between maternal parenting style and the spontaneous regulatory content of private speech in 3- to 5-year-old children (N = 70) during a problem-solving Duplo construction task. Sixty-six children used intelligible private speech which was coded according to its functional self-regulatory content (i.e., forethought, performance, and self-reflective). Mothers completed the Australian version of the Parenting Styles and Dimensions Questionnaire. Results revealed a significant positive association between maternal authoritative parenting and the frequency and proportion of children's forethought type (i.e., planning and self-motivational) utterances during the construction task. There were no significant associations between maternal parenting style and other private speech content subtypes.

Toward characterization of perceptual specialization for faces in Multiracial contexts

This conceptual analysis focuses on opportunities to advance research and current hypotheses of perceptual development by examining what is presently known and unknown about perceptual specialization in a Multiracial context during the first year of life. The impact of being raised in a Multiracial family or community is discussed to further characterize the development of perceptual expertise for faces and languages. Historical and present-day challenges faced by researchers in defining what race is, identifying Multiracial individuals or contexts, and how to study perceptual and cognitive processes in this population are discussed. We propose to leverage current data from developmental Multilingual populations as a guide for future research questions and hypotheses characterizing perceptual specialization based on face race for Multiracial/Multiethnic individuals and contexts. Variability of input and the pattern of specialization are two factors identified from the developmental Multilingual literature that are likely useful for studying Multiracial contexts and development. Several methodological considerations are proposed in hopes of facilitating research questions and practices that are reflective of and informed by the diversity of experiences and social complexities within Multiracial populations.

ADHD in Black Youth: A Content Analysis of Empirical Research from 1972 to 2023

OBJECTIVE

The purpose of this content analysis study was to characterize patterns of research on Black youth with ADHD.

METHOD

Relevant articles were identified through searching psychology and medical databases and cross-referencing citations in previously published review articles. The 204 empirical articles included in this study (1) were conducted in the United States, (2) had a predominantly child or adolescent sample, (3) had more than 80% Black youth/families in the study sample and/or conducted separate analyses for Black youth/families, and (4) examined ADHD symptoms or diagnoses. Articles were categorized into five primary content areas: Assessment, Treatment, Perceptions, Prevalence, and Associated Correlates. Journal characteristics, sample characteristics, and methodological characteristics are presented across these content areas.

RESULTS

Findings show a relatively low representation of Black youth with ADHD in the literature, with most studies using race comparative approaches and secondary data analyses, and many being published in medical journals.

CONCLUSION

Based on these results, changes are recommended both at the individual study and broader systems levels (e.g., funding agencies). More research, funding, and publications centering Black youth with ADHD are vital to understanding and correcting long-standing health disparities for this community.

From silos to synergy: Integrating approaches to investigate the role of prior knowledge and expectations on episodic memory

Significant progress in the investigation of how prior knowledge influences episodic memory has been made using three sometimes isolated (but not mutually exclusive) approaches: strictly adult behavioral investigations, computational models, and investigations into the development of the system. Here we point out that these approaches are complementary, each approach informs and is informed by the other. Thus, a natural next step for research is to combine all three approaches to further our understanding of the role of prior knowledge in episodic memory. Here we use studies of memory for expectation-congruent and incongruent information from each of these often disparate approaches to illustrate how combining approaches can be used to test and revise theories from the other. This domain is particularly advantageous because it highlights important features of more general memory processes, further differentiates models of memory, and can shed light on developmental change in the memory system. We then present a case study to illustrate the progress that can be made from integrating all three approaches and highlight the need for more endeavors in this vein. As a first step, we also propose a new computational model of memory that takes into account behavioral and developmental factors that can influence prior knowledge and episodic memory interactions. This integrated approach has great potential for offering novel insights into the relationship between prior knowledge and episodic memory, and cognition more broadly.

Evidence for a specific distortion in perceptual body image in eating disorders: A replication and extension

A core feature of eating disorders, such as anorexia nervosa, is an overestimation of body size. A key question is whether this overestimation arises solely from body image concerns typical in eating disorders, or if there is an additional perceptual disturbance. To address this question, we applied a two-component model of body size estimation that has been thoroughly replicated in the body image literature concerning healthy individuals. This model shows statistically independent, additive effects on body size estimates of: a) body image concerns, and b) a perceptual component known as contraction bias. Here body image concerns were defined by a principal components analysis (PCA) of psychometric tasks including the: Eating Disorder Examination Questionnaire, Beck Depression Inventory, Body Shape Questionnaire, Rosenberg Self-Esteem Scale, and Sociocultural Attitudes Towards Appearance Questionnaire-4. The PCA identified three components referred to as PSYCH, FAMPEER, and ATHIN. We investigated the influence of age, personal body mass index (BMI), and these three components on body size estimation in 33 women with a current or past history of eating disorders and 100 healthy controls. Low-BMI control participants overestimated their size, while high-BMI controls underestimated their size, exhibiting the expected normal perceptual contraction bias. However, the women with a history of eating disorders showed no evidence of contraction bias, suggesting a different processing of perceptual aspects of body size estimation compared to controls. We discuss two putative mechanisms that can explain these differences in accuracy of personal body size estimation.

Adolescents' Daily Lives (ADL) project: an intensive longitudinal design study protocol examining the associations between physical literacy, movement behaviours, emotion regulation and mental health

INTRODUCTION

Adolescence represents a critical developmental period, with changes in emotional regulation capacities influencing physical and mental health. With less than 6% of Canadian youth currently meeting the 24-hour movement guidelines for physical activity, sleep and sedentary behaviour, there is an urgent need to understand the potential association between movement behaviours, physical literacy, emotional regulation and mental health during adolescence. Additionally, there is a need to better understand these associations among equity-deserving groups. We developed the Adolescents' Daily Lives (ADL) project to identify how, when, under what contexts and to whom to promote healthy engagement in movement behaviours to optimise youth mental health.

METHODS AND ANALYSIS

For the ADL project, we will employ a 14-day intensive longitudinal design to investigate the associations between physical literacy, movement behaviours, emotion regulation and mental health among a diverse sample of 120 adolescents (ages 13-17 years) living in the Greater Victoria Area, British Columbia, Canada. A comprehensive baseline survey and movement competence test, assessing physical and mental well-being, 24-hour movement behaviours (ie, physical activity, sleep and sedentary behaviours) and physical literacy, will be accompanied by daily diary surveys and accelerometer-based movement tracking (ie, Fitbit Inspire 3) to assess daily fluctuations in movement behaviour, emotional regulation and mood. Multivariate analyses, including multilevel modelling, multilevel structural equation modelling and Bayesian hierarchical continuous-time SEM, will be used to model the repeated measures data and understand the simultaneous variations in daily movement behaviours, emotion regulation and mental health.

ETHICS AND DISSEMINATION

The ADL project received ethical approval from the University of Victoria Behavioural Research Ethics Board (protocol #22-0262). Study participation is voluntary, and data collection will be anonymised to protect participant privacy and confidentiality. Research findings will be shared through academic publications and conference proceedings. Through knowledge mobilisation resources, cocreated with the youth community advisory board, relevant findings will be shared directly with the wider community of adolescents.

Children consider informants' explanation quality with their social dominance in seeking novel explanations

Identifying high-quality causal explanations is key to scientific understanding. This research (N = 202; 50% girls; M age: 5.82 years; 64% Asian, 33% White, and 3% multiracial; data collected from 2018 to 2024) examined how explanation circularity and informants' social dominance impact children's learning preferences for causal explanations. Raised in a culture valuing circular logic, Chinese children still preferred non-circular explanations and learning from informants providing non-circular explanations (d ≥ 0.50). When informants with non-circular explanations were subordinate to those with circular explanations, Chinese and American children preferred non-circular over circular explanations (d = 1.10), but did not prefer learning new information from either informant. Although children weigh explanation quality over informant dominance when seeking explanations for given questions, they consider both cues when evaluating informants' credibility.

Variation in gaze following across the life span: A process-level perspective

Following eye gaze is fundamental for many social-cognitive abilities, for example, when judging what another agent can or cannot know. While the emergence of gaze following has been thoroughly studied on a group level, we know little about (a) the developmental trajectory beyond infancy and (b) the sources of individual differences. In Study 1, we examined gaze following across the lifespan (N = 478 3- to 19-year-olds from Leipzig, Germany; and N = 240 20- to 80-year-old international, remotely tested adults). We found a steep performance improvement during preschool years, in which children became more precise in locating the attentional focus of an agent. Precision levels then stayed comparably stable throughout adulthood with a minor decline toward old age. In Study 2, we formalized the process of gaze following in a computational cognitive model that allowed us to conceptualize individual differences in a psychologically meaningful way (N = 60 3- to 5-year-olds, 50 adults). According to our model, participants estimate pupil angles with varying levels of precision based on observing the pupil location within the agent's eyes. In Study 3, we empirically tested how gaze following relates to vector following in non-social settings and perspective-taking abilities (N = 102 4- to 5-year-olds). We found that gaze following is associated with both of these abilities but less so with other Theory of Mind tasks. This work illustrates how the combination of reliable measurement instruments and formal theoretical models allows us to explore the in(ter)dependence of core social-cognitive processes in greater detail. RESEARCH HIGHLIGHTS: Gaze following develops beyond infancy. The highest precision levels in localizing attentional foci are reached in young adulthood with a slight decrease towards old age. We present a computational model that describes gaze following as a process of estimating pupil angles and the corresponding gaze vectors. The model explains individual differences and recovers signature patterns in the data. To estimate the relation between gaze- and vector following, we designed a non-social vector following task. We found substantial correlations between gaze following and vector following, as well as Level 2 perspective-taking. Other Theory of Mind tasks did not correlate.

Why experimental variation in neuroimaging should be embraced

In a perfect world, scientists would develop analyses that are guaranteed to reveal the ground truth of a research question. In reality, there are countless viable workflows that produce distinct, often conflicting, results. Although reproducibility places a necessary bound on the validity of results, it is not sufficient for claiming underlying validity, eventual utility, or generalizability. In this work we focus on how embracing variability in data analysis can improve the generalizability of results. We contextualize how design decisions in brain imaging can be made to capture variation, highlight examples, and discuss how variability capture may improve the quality of results.

The Brain Imaging for Global Health (BRIGHT) Project: Longitudinal cohort study protocol

There is a scarcity of prospective longitudinal research targeted at early postnatal life which maps developmental pathways of early-stage processing and brain specialisation in the context of early adversity. Follow up from infancy into the one-five year age range is key, as it constitutes a critical gap between infant and early childhood studies. Availability of portable neuroimaging (functional near infrared spectroscopy (fNIRS) and electroencephalography (EEG)) has enabled access to rural settings increasing the diversity of our sampling and broadening developmental research to include previously underrepresented ethnic-racial and geographical groups in low- and middle- income countries (LMICs). The primary objective of the Brain Imaging for Global Health (BRIGHT) project was to establish brain function - using longitudinal data from mother - for-age reference curves infant dyads living in the UK and rural Gambia and investigate the association between context-associated moderators and developmental trajectories across the first two years of life in The Gambia. In total, 265 participating families were seen during pregnancy, at 7-14 days, 1-, 5-, 8-, 12-, 18- and 24-months post-partum. An additional visit is now underway at 3-5 years to assess pre-school outcomes. The majority of our Gambian cohort live in poverty, but while resource-poor in many factors they commonly experience a rich and beneficial family and caregiving context with multigenerational care and a close-knit supportive community. Understanding the impact of different factors at play in such an environment ( i.e., detrimental undernutrition versus beneficial multigenerational family support) will (i) improve the representativeness of models of general cognitive developmental pathways from birth, (ii) identify causal pathways of altered trajectories associated with early adversity at both individual and group level, and (iii) identify the context-associated moderators ( i.e. social context) that protect development despite the presence of poverty-associated challenges. This will in turn contribute to the development of targeted interventions.

The Role of Parental Verbal Threat Information in Children's Fear Acquisition: A Systematic Review and Meta-analysis

Children can acquire fears of novel stimuli as a result of listening to parental verbal threat information about these stimuli (i.e., instructional learning). While empirical studies have shown that learning via parental information occurs, the effect size of parental verbal threat information on child fear of a novel stimulus has not yet been measured in a meta-analysis. We conducted a systematic review and meta analysis to assess the effect of parents' verbal statements on their children's fear acquisition. Additionally, we explored potential moderators of this effect, namely, parent and child anxiety levels, as well as child age. WebOfScience, Pubmed, Medline, and PsycINFO were used to identify eligible studies that assessed children's (30 months to 18 years old) fear of novel stimuli after being exposed to parental verbal threat information. We selected 17 studies for the meta-analysis and 18 for the systematic review. The meta-analysis revealed a significant causal effect of parental verbal threat information on children's fear reaction towards novel stimuli [g = 1.26]. No evidence was found for a moderation of verbal learning effects, neither by child or parent anxiety levels nor by child age. The effect of parents' verbal threat information on children's fear of novel stimuli is large and not dependent on anxiety levels or child age.

Greater attention to socioeconomic status in developmental research can improve the external validity, generalizability, and replicability of developmental science

Psychological researchers have been criticized for making broad presumptions about human behavior based on limited sampling. In part, presumptive generalizability is reflected in the limited representation of sociodemographic variation in research reports. In this analysis, we examine time-trends in reporting of a key sociodemographic construct relevant to many aspects of child development-socioeconomic status (SES)-across six mainstream developmental journals (Infancy, Child Development, Developmental Science, Developmental Psychology, Infant and Child Development, and Infant Behavior & Development) between 2016 and 2022. Findings point to limited reporting of SES across developmental journals and across time. Reporting rates varied significantly by region and by topic of development. In terms of specific indicators of SES, there was consistent use of income and caregiver education as SES indicators. The epistemic costs of the lack of integration of socio-economic factors in developmental research are addressed. Pathways to greater integration of SES are proposed. RESEARCH HIGHLIGHTS: We analyzed reporting and representation of socioeconomic status in published studies on early child development. A large proportion of published studies did not report any socio-economic information. Suggestions for greater attention to socioeconomic status are proposed.

Culturally constituted universals: Evidential basis of belief matters

Differences in the sequence with which children pass the tasks in Wellman and Liu's (2004) theory of mind (ToM) battery is increasingly bringing into question the universal and cultural specifics of children's developing understanding of others' minds. Children from China, Iran, and Turkey pass the knowledge access (KA) task of the battery earlier than they pass the diverse beliefs (DB) task (e.g., Selcuk et al., 2018). This pattern is the reverse of what has been documented with children from Australia and the US (e.g., Peterson et al., 2005). This paper presents three studies with Turkish samples that explore the possible reasons for developmental sequence and performance differences in the ToM battery. Study 1 investigated Turkish-speaking adults' judgments of appropriateness for different epistemic verbs as used in the DB and false belief (FB) tasks. Study 2 investigated whether adults' performance (i.e., accuracy, reaction time) on FB tasks were affected by culturally preferred uses of these verbs. Collectively these studies showed that adults found different epistemic language ("guess," "think," and the Turkish-specific "falsely think") to be appropriate for different belief-based tasks. However, there was no difference in adults' performance based on epistemic language. In Study 3, Turkish-speaking preschoolers' performance in belief-related tasks based on variations in epistemic language and epistemic features (i.e., presence of evidence) was investigated. Among five modifications, Turkish children benefited only from a modification that involved the manipulation of the epistemological basis for ambiguous beliefs (i.e., visual evidence for belief). RESEARCH HIGHLIGHTS: Turkish adults find different epistemic language ("guess," "think," and the Turkish-specific "falsely-think") to be appropriate for different belief-based tasks (diverse and false belief tasks). Turkish adults' performance on false belief (FB) tasks is not affected by epistemic language. Turkish children perform better in diverse beliefs (DB) task if an epistemological basis for ambiguous beliefs (i.e., visual evidence for either belief) is provided.

Links between booksharing and early vocabulary development in Costa Rica

Early vocabulary development is crucial for future cognitive and academic outcomes, and parent-child booksharing has been recognized as a powerful home literacy practice to promote word learning. However, evidence about the link between booksharing and language development in diverse cultural and socioeconomic settings is currently limited, hindering the formulation of a broadly applicable framework to understand the favorable conditions for early vocabulary development. This study explores the relationship between booksharing and early receptive and expressive vocabulary in a sample of 183 mothers and their toddlers in Costa Rica, a context where reading is not a common practice and children have limited access to books. Mothers completed an interview about their booksharing practices and reported children's receptive and expressive vocabulary. Results demonstrated a positive link between maternal booksharing and children's expressive vocabulary. Child gender moderated the link between booksharing and receptive vocabulary, exhibiting a stronger association in girls than in boys. Mothers with lower education levels reported higher expressive vocabulary scores for their children than mothers with higher education levels. These findings underscore the significance of booksharing in the home literacy environment, even in cultural contexts with distinct reading practices. Moreover, they highlight the need to incorporate sociocultural factors into comprehensive accounts concerning the role of booksharing in early word learning.

Contrasting one's share of the shared life space: Comparing the roles of metacognition and inhibitory control in the development of theory of mind among Scottish and Japanese children

Cultural comparisons suggest that an understanding of other minds may develop sooner in independent versus interdependent settings, and vice versa for inhibitory control. From a western lens, this pattern might be considered paradoxical, since there is a robust positive relationship between theory of mind (ToM) and inhibitory control in western samples. In independent cultures, an emphasis on one's own mind offers a clear route to 'simulate' other minds, and inhibitory control may be required to set aside one's own perspective to represent the perspective of others. However, in interdependent cultures, social norms are considered the key catalyst for behaviour, and metacognitive reflection and/or suppression of one's own perspective may not be necessary. The cross-cultural generalizability of the western developmental route to ToM is therefore questionable. The current study used an age-matched cross-sectional sample to contrast 56 Japanese and 56 Scottish 3-6-year-old's metacognition, ToM and inhibitory control skills. We replicated the expected cultural patterns for ToM (Scotland > Japan) and inhibitory control (Japan > Scotland). Supporting western developmental enrichment theories, we find that inhibitory control and metacognition predict theory of mind competence in Scotland. However, these variables cannot be used to predict Japanese ToM. This confirms that individualistic mechanisms do not capture the developmental mechanism underlying ToM in Japan, highlighting a bias in our understanding of ToM development. RESEARCH HIGHLIGHTS: We replicate an independent cultural advantage for theory of mind (Scotland > Japan) and interdependent advantage for inhibitory control (Japan > Scotland). From a western lens, this pattern might be considered paradoxical, since there is a robust positive relationship between theory of mind and inhibitory control. Supporting western developmental enrichment theories, we find that the development of inhibitory control mediates the link between metacognition and theory of mind in Scotland. However, this model does not predict Japanese theory of mind, highlighting an individualistic bias in our mechanistic understanding of theory of mind development.

Children's risk preferences vary across sexes, social contexts, and cultures

People exhibit more risk-prone behaviors when together with peers than when in private. The interplay of social context effects and other variables that alter human risk preferences (i.e., age, sex, or culture) remains poorly understood. Here, we explored risk preferences among Namibian Hai||om and Ovambo children (N = 144; AgeRange = 6-10 years). Participants chose between risky and safe options in private or during peer presence. In a third condition, children collaborated with peers before their risk preferences were assessed in those peers' presence. Children from both societies were risk-averse, but Hai||om children showed greater risk aversion than their Ovambo counterparts. Across cultures and ages, boys were less averse to risks than girls. This effect was most pronounced during peer presence, whereas collaboration did not additionally affect risk preferences. These results suggest a dynamic interplay of individual, social, and cultural factors shaping children's risk preferences.

e-Babylab: An open-source browser-based tool for unmoderated online developmental studies

The COVID-19 pandemic massively changed the context and feasibility of developmental research. This new reality, as well as considerations about sample diversity and naturalistic settings for developmental research, highlights the need for solutions for online studies. In this article, we present e-Babylab, an open-source browser-based tool for unmoderated online studies targeted for young children and babies. e-Babylab offers an intuitive graphical user interface for study creation and management of studies, users, participant data, and stimulus material, with no programming skills required. Various kinds of audiovisual media can be presented as stimuli, and possible measures include webcam recordings, audio recordings, key presses, mouse-click/touch coordinates, and reaction times. An additional feature of e-Babylab is the possibility to administer short adaptive versions of MacArthur-Bates Communicative Development Inventories (Chai et al. Journal of Speech, Language, and Hearing Research, 63, 3488-3500, 2020). Information pages, consent forms, and participant forms are customizable. e-Babylab has been used with a variety of measures and paradigms in over 12 studies with children aged 12 months to 8 years (n = 1516). We briefly summarize some results of these studies to demonstrate that data quality, participant engagement, and overall results are comparable between laboratory and online settings. Finally, we discuss helpful tips for using e-Babylab and present plans for upgrades.

Comparing experience- and description-based economic preferences across 11 countries

Recent evidence indicates that reward value encoding in humans is highly context dependent, leading to suboptimal decisions in some cases, but whether this computational constraint on valuation is a shared feature of human cognition remains unknown. Here we studied the behaviour of n = 561 individuals from 11 countries of markedly different socioeconomic and cultural makeup. Our findings show that context sensitivity was present in all 11 countries. Suboptimal decisions generated by context manipulation were not explained by risk aversion, as estimated through a separate description-based choice task (that is, lotteries) consisting of matched decision offers. Conversely, risk aversion significantly differed across countries. Overall, our findings suggest that context-dependent reward value encoding is a feature of human cognition that remains consistently present across different countries, as opposed to description-based decision-making, which is more permeable to cultural factors.

Children's questions and teachers' responses about COVID-19 in Türkiye and the US

Question-asking is a crucial tool for acquiring information about unseen entities, such as viruses; thus, examining children's questions within the context of COVID-19 is particularly important for understanding children's learning about the coronavirus. The study examined 3-12-year-old children's questions and teachers' responses about the COVID-19 pandemic in Türkiye, a non-Western developing context, and the United States, a Western cultural context. A total of 119 teachers from Türkiye and 95 teachers from the US participated in the study. Teachers completed an online survey consisting of a demographic form and a questionnaire asking them to report three questions about COVID-19 asked by children in their classrooms and their responses to these questions. We analyzed children's questions and teachers' responses for their type and content and examined demographic factors associated with children's questions and teachers' responses. Consistent with the literature, children from Türkiye asked fewer explanation-seeking (i.e., why/how) questions than children from the United States. Children asked questions about viruses and precautions. Teachers responded to children's questions realistically in both countries. The findings have important implications for how children gain knowledge from teachers when discussing health, disease, and virus topics in two countries.

Alexithymia as a mediator between adverse childhood events and the development of psychopathology: a meta-analysis

Introduction

Victims of child abuse have an elevated risk of developing mental health issues later in life. Several variables have been suggested as mediators of this correlation, but little is known about the possible influence of alexithymia. Alexithymia is a sub-clinical personality trait that manifests as difficulties recognizing and verbalizing emotions.

Methods

In this study, two separate meta-analyses were conducted using questionnaire data, and Pearson correlations for overall effects were estimated.

Results

The correlation between child abuse and alexithymia showed to be significant (r = .26), as did the correlation between alexithymia and general psychopathology (r = .44). Further analyses revealed no indication for possible publication bias. When investigating differences between various subtypes of child maltreatment, each subtype significantly correlated with alexithymia. Emotional abuse, emotional neglect, and physical neglect had stronger correlations than physical and sexual abuse.

Discussion

These results suggest that alexithymia plays a mediating role, at least in part, in the relationship between experiences of child abuse and general psychopathology in adulthood. Therefore, alexithymia may be relevant to further research and deserves attention in the prevention of and therapy for mental health issues in victims of child abuse.

Am I a good person? Academic correlates of explicit and implicit self-esteem during early childhood

Implicit and explicit self-esteem are not commonly measured in the same children. Using a cross-sectional design, data from 354 Croatian children (184 girls) in Grade 1 (Mage = 7.55 years) and Grade 5 (Mage = 11.58 years) were collected in Spring 2019. All children completed explicit and implicit self-esteem measures; math and language grades were obtained. For the explicit measure, older children showed lower self-esteem than younger children, and girls showed lower self-esteem than boys. For the implicit measure, there were no age effects, and girls showed higher self-esteem than boys. Although both types of self-esteem were positively associated with academic achievement, implicit self-esteem was associated more strongly with language than with math achievement. Discussion is provided about why self-esteem relates to academic achievement during childhood.

Gender diversity in a Chinese community sample and its associations with autism traits

Emerging evidence suggests that gender dysphoria or gender diversity (GD) intersects frequently with autism spectrum disorder or autism traits. However, the magnitude and interpretation of this link continue to be debated. Most child studies on this topic were performed in clinical populations, and little is known about the generalizability of this co-occurrence to the broader community, especially to non-Western samples. Also, little is known about whether specific subdomains of autism are more strongly associated with GD. Therefore, we investigated GD and its association with autism traits in a Chinese community sample of 4-12-year-olds (N = 379; 51% birth-assigned girls). Parents provided information about GD characteristics using the standardized Gender Identity Questionnaire for Children and autism traits using the Chinese version of the Autism-Spectrum Quotient-Children. In addition, broader behavioral and emotional challenges were measured by the Behavior Problem Index (BPI) to account for psychological challenges other than autism traits. In this community sample of Chinese children, increased GD was associated with increased autism traits, even after accounting for the BPI. Of the four subscales, the Imagination and Patterns subscales in birth-assigned girls and the Imagination subscale in birth-assigned boys were especially associated with GD. These findings indicate that the association between GD and autism traits generalizes to a nonclinical, non-Western sample. Clinicians and researchers working with clinical as well as community children should thus pay attention to the co-occurrence of GD and autism traits, in and outside the West.

A metascience investigation of inclusive, open, and reproducible science practices in research posters at the 2021 SRCD biennial meeting

Over the past decade, there has been a growing appreciation of metascience issues in psychological science. Using data collected from 2615 posters presented at the 2021 biennial meeting of the Society for Research in Child Development, this article examines the use of transparent research practices to increase rigor and reproducibility as well as generalizability through greater inclusivity of diverse samples. Research presented through poster presentations was heavily skewed toward quantitative studies featuring American researchers using Western hemisphere samples. Sharing of data/materials, preregistrations, and replications were uncommon. During a time when governments are increasingly requiring more open practices and access, this research provides an important baseline by which developmental science can benchmark progress toward the goals of greater inclusivity and openness.

Conducting Developmental Research Online vs. In-Person: A Meta-Analysis

An increasing number of psychological experiments with children are being conducted using online platforms, in part due to the COVID-19 pandemic. Individual replications have compared the findings of particular experiments online and in-person, but the general effect of data collection method on data collected from children is still unknown. Therefore, the goal of the current meta-analysis is to estimate the average difference in effect size for developmental studies conducted online compared to the same studies conducted in-person. Our pre-registered analysis includes 211 effect sizes calculated from 30 papers with 3282 children, ranging in age from four months to six years. The estimated effect size for studies conducted online was slightly smaller than for their counterparts conducted in-person, a difference of d = -.05, but this difference was not significant, 95% CI = [-.17, .07]. We examined several potential moderators of the effect of online testing, including the role of dependent measure (looking vs verbal), online study method (moderated vs unmoderated), and age, but none of these were significant. The literature to date thus suggests-on average-small differences in results between in-person and online experimentation.

Testing the validity of online psychophysical measurement of body image perception

This body image study tests the viability of transferring a complex psychophysical paradigm from a controlled in-person laboratory task to an online environment. 172 female participants made online judgements about their own body size when viewing images of computer-generated female bodies presented in either in front-view or at 45-degrees in a method of adjustment (MOA) paradigm. The results of these judgements were then compared to the results of two laboratory-based studies (with 96 and 40 female participants respectively) to establish three key findings. Firstly, the results show that the accuracy of online and in-lab estimates of body size are comparable, secondly that the same patterns of visual biases in judgements are shown both in-lab and online, and thirdly online data shows the same view-orientation advantage in accuracy in body size judgements as the laboratory studies. Thus, this study suggests that that online sampling potentially represents a rapid and accurate way of collecting reliable complex behavioural and perceptual data from a more diverse range of participants than is normally sampled in laboratory-based studies. It also offers the potential for designing stratified sampling strategies to construct a truly representative sample of a target population.

Daylong egocentric recordings in small- and large-scale language communities: A practical introduction

Daylong egocentric (i.e., participant-centered) recordings promise an unprecedented view into the experiences that drive early language learning, impacting both assumptions and theories about how learning happens. Thanks to recent advances in technology, collecting long-form audio, photo, and video recordings with child-worn devices is cheaper and more convenient than ever. These recording methods can be similarly deployed across small- and large-scale language communities around the world, opening up enormous possibilities for comparative research on early language development. However, building new high-quality naturalistic corpora is a massive investment of time and money. In this chapter, we provide a practical look into considerations relevant for developing and managing daylong egocentric recording projects: Is it possible to re-use existing data? How much time will manual annotation take? Can automated tools sufficiently tackle the questions at hand? We conclude by outlining two exciting directions for future naturalistic child language research.

Infants who are rarely spoken to nevertheless understand many words

Theories of language development-informed largely by studies of Western, middleclass infants-have highlighted the language that caregivers direct to children as a key driver of language learning. However, some have argued that language development unfolds similarly across environmental contexts, including those in which childdirected language is scarce. This raises the possibility that children are able to learn from other sources of language in their environments, particularly the language directed to others in their environment. We explore this hypothesis with infants in an indigenous Tseltal-speaking community in Southern Mexico who are rarely spoken to, yet have the opportunity to overhear a great deal of other-directed language by virtue of being carried on their mothers' backs. Adapting a previously established gaze-tracking method for detecting early word knowledge to our field setting, we find that Tseltal infants exhibit implicit knowledge of common nouns (Exp. 1), analogous to their US peers who are frequently spoken to. Moreover, they exhibit comprehension of Tseltal honorific terms that are exclusively used to greet adults in the community (Exp. 2), representing language that could only have been learned through overhearing. In so doing, Tseltal infants demonstrate an ability to discriminate words with similar meanings and perceptually similar referents at an earlier age than has been shown among Western children. Together, these results suggest that for some infants, learning from overhearing may be an important path toward developing language.

Parent attitudes towards data sharing in developmental science

Background

Data sharing in developmental science is increasingly encouraged, supported by funder and publisher mandates for open data access. Data sharing can accelerate discovery, link researchers with high quality analytic expertise to researchers with large datasets and democratise the research landscape to enable researchers with limited funding to access large sample sizes. However, there are also significant privacy and security concerns, in addition to conceptual and ethical considerations. These are particularly acute for developmental science, where child participants cannot consent themselves. As we move forward into a new era of data openness, it is essential that we adequately represent the views of stakeholder communities in designing data sharing efforts.

Methods

We conducted a comprehensive survey of the opinions of 195 parents on data sharing in developmental science. Survey themes included how widely parents are willing to share their child's data, which type of organisations they would share the data with and the type of consent they would be comfortable providing.

Results

Results showed that parents were generally supportive of curated, but not open, data sharing. In addition to individual privacy and security concerns, more altruistic considerations around the purpose of research were important. Parents overwhelmingly supported nuanced consenting models in which preferences for particular types of data sharing could be changed over time. This model is different to that implemented in the vast majority of developmental science research and is contrary to many funder or publisher mandates.

Conclusions

The field should look to create shared repositories that implement features such as dynamic consent and mechanisms for curated sharing that allow consideration of the scientific questions addressed. Better communication and outreach are required to build trust in data sharing, and advanced analytic methods will be required to understand the impact of selective sharing on reproducibility and representativeness of research datasets.

Longitudinal Relations Among Executive Function, Theory of Mind, and Japanese Language Skills Achievement in Elementary School: A 4-year Longitudinal Study

This longitudinal study investigated the roles of elementary schoolers' executive function (EF) and theory of mind (ToM) as predictors in their academic achievements in Japanese language skills (e.g., speaking and listening ability, writing ability, reading ability, and linguistic knowledge) from first through fifth grade. We assessed the EF, ToM, and academic achievements of 85 Japanese elementary schoolers, when they were grade 1 (M = 90.19 months) and grade 3 (M = 114.34 months). Moreover, academic achievements of same children tested in grade 5 (M = 137.92 months). A path analysis revealed that EF abilities in Grades 1 and 3 predicted Japanese language achievement via ToM ability, and EF and ToM in Grade 1 had an indirect effect on achievements in Grades 3 and 5. Further, Japanese language skills achievement in Grade 1 predicted EF ability in Grade 3 and EF predicted achievement in Grade 5. These findings indicate the vital role of elementary schoolers' EF on academic achievement in Japan.

A systematic review of the concept of self-regulation in infants between 0 and 36 months in Latin America

This paper aims to identify how cognitive and emotional self-regulation (SR) processes in infants from 0 to 36 months are defined within the Latin American academic context. A systematic review based on the PRISMA methodology was implemented to review the conceptual and operational definition of SR, the type of study, the country of origin of the authors, and the reference to the adequacy of the research to the specific cultural context of Latin America. Twenty-two papers that met the selection criteria were selected. The study identified four types of conceptual definitions for SR, each associated with different constructs or sets of constructs: executive functions, temperament, the integration of executive functions and temperament, and physiological homeostasis. These definitions were based on mainstream approaches to SR rather than being specific to the Latin American region. The study also found compatibility between the sample and some observed trends. On one hand, there was an underrepresentation of the Latin American population in high-impact publications on the subject. However, from 2010 to the present, there is evidence of growth in publications on SR in the analyzed sample. On the other hand, the sample also indicates a disparate representation of the countries of Latin America and the Caribbean in existing publications. Finally, concerning the adaptation to the cultural context of the research, a small number of studies addressed this variable in a specific and significant way. However, even in these cases, the approach is based on models and hypotheses that are limited to understanding the Latin American region's cultural, socioeconomic, and demographic diversity.

Sample characteristics for quantitative analyses in Body Image: Issues of generalisability

Psychological research frequently encounters criticism regarding the representativeness of the samples under study, highlighting concerns about the external validity of the obtained results. Here, we conducted a comprehensive survey of all the quantitative samples from the journal Body Image for 2021 (n = 149 samples). Our primary objective was to examine the extent to which the sampled populations deviated from the population at large, which could potentially compromise the generalizability of findings. We identified that a substantial number of these samples came from student populations (n = 44) and the majority were from the United States, United Kingdom, and Australia. Only a small number of samples (n = 9) employed direct measurements of body mass index (BMI), while the majority relied on self-reported data (n = 93). For a subset of samples in the journal, which were drawn from the general population, we compared whether these differed from population reference values in terms of age and BMI. Using Monte Carlo simulations, we found that samples tended to be younger and score lower on BMI than reference values obtained from the broader population. Samples drawn from female university students also tended to be lower on BMI than age-matched reference samples. We discuss the implications of our findings and make recommendations on sampling and inference. We conclude that a clearer specification of the parameters or conditions under which findings are expected to generalise has the potential to enhance the overall rigor and validity of this field of research.

Towards a decolonial developmental science: Adolescent development in the Majority World taking center stage

While aspiring to be a diverse and global science, developmental science continues to be dominated by EuroAmerican epistemologies, researchers, and communities in its published scholarship. Adolescents in communities across Africa, Asia, the Middle East, and Latin America comprise 85% of the world's adolescent population, and yet their experiences and perspectives are marginalized in our science. Adolescents in the Majority World live in highly diverse social, cultural, political, economic, educational and healthcare contexts that contribute to their development, and we have much to learn from their experiences. This article situates the marginalization of the global majority within coloniality embedded in developmental science. The article describes the impetus for this special issue Towards a decolonial developmental science and the process of putting it together, along with providing an overview of the 18 articles in this collection that push us towards decoloniality. The special issue serves as a call to transform developmental science to be decolonial by empowering adolescent development in Majority World communities to take center stage. Adolescent development research from Majority World communities has the potential to challenge the knowledge base generated from Minority World samples, contributing to a science that is comprehensive, inclusive, and can inform prevention and intervention efforts to support the well-being of adolescents globally.

Toward a globally inclusive knowledge base on adolescent development: A charge to the Majority World and a plea for epistemic and paradigmatic pluralism

Ongoing internal dialog on the limitations of Euro-American developmental science has opened up space to explore how best to work toward a knowledge base that is adequately representative of the values, cultures, epistemic traditions, and lived experiences of peoples, nations, and regions around the world. So far, recommendations for the advancement of a global developmental science have focused preponderantly on (1) methodological considerations and (2) an architecture to support cross-disciplinary international collaborative inquiry and/or enhance research capacity building for Majority World scholars and institutions. In this commentary, instead of focusing on specific contributions to the Special Issue, I make a case for an explicit commitment to field-building within Majority World contexts as the primary gap-closing path toward the cultivation of a global developmental science knowledge base. I begin with a worldwide population analysis to demonstrate the magnitude of geopolitical, eco-cultural, and epistemic imbalances inherent in the shaping of Euro-American developmental science. In tandem with the Special Issue's central theme, I draw on scholarship from the fields of history, sociology, and political economy to link decolonial theory to the advancement of a global developmental science. Finally, I explore ways in which exemplary research establishments already engaged in prolific inquiry and research training may be ideal candidates to support field-building and help to advance multidisciplinary inquiry within an ethos of epistemic and methodological pluralism.

Unpacking the prevalence: A warning against overstating the recently narrowed gap for Black autistic youth

Recent findings from the Centers for Disease Control and Prevention's (CDC) Autism and Developmental Disabilities Monitoring (ADDM) Network's 2020 prevalence report indicate that disparities in autism diagnoses between Black and White youth have narrowed, reflecting improved screening, awareness, and access to services (Maenner et al., 2023. Morbidity and Mortality Weekly Report. Surveillance Summaries (Washington, D.C.: 2002), 72, 1-14.). Claims of reducing disparities beyond prevalence rates, however, are not fully supported, as indicated by the reality that Black youth whose screenings indicate autistic traits are still not being referred for full evaluation or early intervention services at the same rate as their White peers (Major et al., 2020. Autism, 24, 1629-1638; Smith et al., 2020. Pediatrics, 145, S35-S46.). Black 8-year-olds identified as autistic still experience disparate educational placements (Waitoller et al., 2010. The Journal of Special Education. 44, 29-49.) where services may not be autism-specific or have Individual Education Plan goals only focused on "behavior problems" (Severini et al., 2018. Journal of Autism and Developmental Disorders, 48, 3261-3272.), are served in the most restrictive environments (Skiba et al., 2006. Exceptional Children, 72, 411-424.) and lack consistent augmentative and alternative communication support (Pope et al., 2022. American Journal of Speech-Language Pathology, 31, 2159-2174.). Additionally, ADMM researchers report consistent disparities in the identification of co-occurring intellectual disability where Black autistic children have significantly more co-occurrences than White autistic children. The purpose of this commentary is to first examine the assertion that the narrowed gap indicates, "…improved…access to services among historically underserved groups," (p. 9) (Maenner et al., 2023. Morbidity and Mortality Weekly Report. Surveillance Summaries (Washington, D.C.: 2002), 72, 1-14.). We will then recommend strategies to address the ongoing disparities.