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Common cause versus dynamic mutualism: Insights into ADHD's common comorbidities.
1Department of Psychological Sciences Vanderbilt University Nashville Tennessee USA.
JCPP Advances
|July 8, 2026
Summary
The common cause model better explains Attention-Deficit/Hyperactivity Disorder (ADHD) comorbidity than dynamic mutualism. ADHD bridges externalizing and neurodevelopmental domains, with specific symptoms linking to each spectrum.
Area of Science:
- Neurodevelopmental disorders
- Child and adolescent psychiatry
- Behavioral science
Background:
- Current ADHD classifications debate its nature as externalizing or neurodevelopmental.
- Both perspectives often use the common cause model for ADHD comorbidity.
- Dynamic mutualism offers an alternative, suggesting symptom interactions over time.
Purpose of the Study:
- To test the common cause and dynamic mutualism theories for ADHD comorbidity.
- To examine associations between ADHD aspects and neurodevelopmental/externalizing spectra.
- To analyze data from the Adolescent Brain Cognitive Development (ABCD) Study.
Main Methods:
- Utilized data from 11,878 youths in the ABCD Study (ages 9-10 at baseline).
- Analyzed four waves of longitudinal data.
- Assessed ADHD, inattention, hyperactivity/impulsivity, and cognitive disengagement.
Main Results:
- Findings largely supported the common cause model for ADHD's developmental links.
- Hyperactivity/impulsivity showed a stronger association with the externalizing spectrum.
- Cognitive disengagement was more closely linked to the neurodevelopmental spectrum.
Conclusions:
- ADHD is best viewed as bridging externalizing and neurodevelopmental domains.
- The common cause model received more support than dynamic mutualism in this study.
- Specific ADHD subdimensions relate differently to externalizing and neurodevelopmental spectra.
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