Distinct Brain Subtypes of ADHD Revealed by New Study

A recent study published in the journal *General Psychiatry* has identified two distinct structural brain subtypes of attention-deficit/hyperactivity disorder (ADHD), each characterized by unique physical traits and behavioral symptoms. This research, led by Tianzheng Zhong and colleagues from Shandong First Medical University in China, suggests that personalized diagnostic and treatment strategies could be developed based on these biological differences.

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The study analyzed structural MRI data from a large public database, ultimately including 135 children and adolescents diagnosed with ADHD and 182 neurotypical youths as a control group. Initial comparisons of overall gray matter between the ADHD group and the control group yielded no statistically significant differences, likely due to the diverse manifestations of ADHD causing structural changes to cancel each other out. To address this, the researchers employed an advanced machine learning algorithm to categorize patients based on their brain anatomy, revealing two distinct subtypes.

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The first subtype exhibited increased gray matter in several brain areas, particularly the frontal regions and cerebellum, which are associated with cognitive functions and attention. Patients in this group primarily struggled with inattentiveness. Conversely, the second subtype showed widespread gray matter atrophy, especially in the cerebellum, frontal regions, and hippocampus, correlating with higher disease severity and a combination of inattentive and hyperactive-impulsive behaviors.

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The findings indicate that ADHD may not be a uniform condition but rather a spectrum of disorders that could benefit from tailored treatment approaches. For the first subtype, targeted cognitive training focusing on enhancing attention networks may be effective. In contrast, the second subtype, characterized by greater severity and structural decline, might require a more intensive combination of medication and behavioral therapy.

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While the study provides valuable insights, it is limited by its cross-sectional design, which captures only a single moment in time for each participant. Future longitudinal studies are necessary to track the progression of these brain changes over time and validate the proposed subtypes. Understanding the neurodevelopmental trajectory of ADHD is crucial for refining treatment strategies.

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This research offers a new perspective on ADHD, highlighting the importance of recognizing distinct neuroanatomical profiles in patients. If confirmed by further studies, these findings could lead to a new era of precision medicine in psychiatry, allowing for more effective and personalized interventions for individuals with ADHD.

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• “Tailoring treatments to these distinct neuroanatomical profiles could pave the way for a new era of precision medicine in psychiatry.” — Tianzheng Zhong, Researcher

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• “The researchers noted that the structural changes in this group were strongly linked to an inability to maintain focus.” — Tianzheng Zhong, Researcher

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• “Patients in this group showed widespread reductions, or atrophy, in their gray matter compared to the neurotypical control group.” — Tianzheng Zhong, Researcher

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• “To confirm these progressive patterns, future studies will need to track the same groups of children over several years.” — Tianzheng Zhong, Researcher

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