Children who show traits of autism or attention deficit hyperactivity disorder (ADHD) face an increased risk of emotional and behavioral problems as they grow older, but the social pathways connecting these traits to mental health are more complicated than previously thought. A long-term study published in the scientific journal Psychological Medicine shows that difficulties with classmates, schoolwork and family do not simply follow a straight line from neurodevelopmental traits.
Autism spectrum disorder (ASD) involves differences in social communication, social interaction and patterns of behavior or interests. ADHD is characterized by persistent patterns of inattention, hyperactivity and impulsivity. Both conditions exist on a continuum, meaning that many children show noticeable traits without a formal clinical diagnosis — and even when these traits fall below diagnostic thresholds, children face an increased risk of emotional distress, whether in the form of internalizing problems such as anxiety and depression or externalizing problems such as anger and disruptive behavior.
Previous research suggested that everyday difficulties might explain these links. A 2018 longitudinal study that followed young people from childhood to age 18 found that elevated autistic traits increased the risk of depressive symptoms, an association partly explained by social difficulties such as bullying. A 2020 study of adolescents showed that childhood ADHD symptoms predicted adolescent depression, partly through academic failures and peer problems. Strained relationships with parents and peers also explained the link between attention difficulties and later depression in a 2013 study, although academic difficulties did not independently explain that relationship in that research.
Because autism and ADHD traits often coexist in the same individuals, the researchers faced the challenge of distinguishing which specific social obstacles stem uniquely from each set of traits. Lead author Eriko Hashimoto, a doctoral student in the School of Humanities and Sciences at Ochanomizu University in Tokyo, explained to PsyPost that many children in school settings show mild traits that do not meet diagnostic criteria, yet may struggle with peers, learning or relationships with adults — and remain outside formal support systems. Together with her supervisor, Professor Hiroyuki Ito, she wanted to address this gap by examining developmental associations in a large sample of school-age children.
The team analyzed data from a large population-based cohort covering all public elementary and junior high schools in a medium-sized municipality in Japan’s Chubu region. The final analysis included 9,619 students from an initial total of 11,549 enrolled children. Students answered questionnaires once each school year from the fourth grade of elementary school to the third year of junior high school, with data from 11 age cohorts collected between 2012 and 2023. Parents assessed their children’s autistic traits using a shortened version of the Autism Spectrum Screening Questionnaire and their ADHD traits using the ADHD Rating Scale-IV. Students completed questionnaires about their perceived difficulties in three areas: keeping up with lessons, conflicts with teachers and arguments with family members. Problems with classmates were assessed using the peer relationships subscale of the Strengths and Difficulties Questionnaire, combining assessments from students, teachers and parents.
The findings revealed distinct developmental patterns for the two types of traits. Autistic traits showed consistent links to later peer difficulties, with standardized coefficients between 0.146 and 0.190 across all grade transitions — values classified as “large” under the criteria the authors used. They were also linked to later internalizing problems, with small to medium coefficients (0.068 to 0.097). By contrast, autistic traits were not consistently linked to later academic difficulties or conflicts with teachers. ADHD traits followed a different pattern: they were linked to later externalizing problems (coefficients of 0.064 to 0.118, with stronger associations in the later elementary school years), as well as increased academic difficulties, particularly in fourth and fifth grade. Academic difficulties, in turn, predicted later internalizing symptoms during elementary school, suggesting that learning difficulties may act as an intermediate pathway connecting attention difficulties to emotional distress.
Rather than revealing one-way effects, the analyses showed notable two-way processes. Peer problems predicted increases in later internalizing symptoms, but higher internalizing symptoms were also linked to worsening peer problems over time. Similarly, externalizing behaviors predicted more frequent conflicts with teachers and parents in subsequent years, and these strained relationships with adults were linked to later increases in behavioral difficulties. Academic problems consistently predicted greater family conflict the following year, with coefficients ranging from 0.105 to 0.163.
The social environment also appeared to feed back into parents’ assessments of neurodevelopmental traits. Experiencing peer problems was linked to higher reported autistic traits in later grades, with coefficients of up to 0.164, while increased externalizing problems predicted higher reported ADHD traits in subsequent waves. These patterns suggest that neurodevelopmental traits may not be fixed and could change depending on a child’s social experiences — although they could also reflect changes in how parents perceive and assess their children when problems arise.
Hashimoto stressed that the study does not establish causation: the findings show associations over time, rather than proof that one factor directly causes another. She also emphasized that children with elevated traits are highly diverse and that the results describe group-level patterns — they should not be interpreted as predictions for any individual child. In addition, the researchers examined traits on a continuum in a general school population, rather than focusing on children with clinical diagnoses, and many of the associations were small to medium in size. The autism questionnaire captured a relatively narrow set of traits, focusing mainly on Asperger-type social and behavioral characteristics rather than the full spectrum.
The authors suggest that early support with organizing schoolwork, peer relationship skills and positive communication between families and schools could help break these cycles, although the study did not test interventions. Future research could incorporate direct observational measures alongside questionnaires and examine whether supportive social environments can moderate these links. The central message, according to Hashimoto, is that ASD and ADHD traits showed different patterns of association with later difficulties — and that it is important to consider both children’s individual traits and the social environments in which they develop.
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