Three ADHD Brain Types Identified in New Study

People with attention deficit hyperactivity disorder (ADHD) may not all experience the condition in the same way, and a new study suggests this difference extends to the brain itself. Researchers have identified three distinct brain patterns, or “biotypes,” associated with different symptom presentations of ADHD, potentially paving the way for more personalized treatment approaches.

Understanding the Research

A study led by Qiyong Gong from Sichuan University examined the brains of 1,000 children with ADHD from clinics in China and the United States. The research team used computer tomography (CT) scans to create geometric maps of the brain surface, comparing these maps between children with ADHD and a control group of 708 individuals without the condition. An algorithm was trained to recognize differences in brain structure.

Identifying Three Distinct Biotypes

The analysis revealed four clusters, with three representing different subgroups of children with ADHD and the fourth representing the control group. These subgroups, or biotypes, were associated with specific symptom patterns:

• Biotype 1: Severe ADHD – This group exhibited the most pronounced ADHD symptoms, including inattention, hyperactivity, and impulsivity. Brain scans showed extensive changes in the frontal lobe and the pallidum, an area crucial for movement control.
• Biotype 2: Hyperactive-Impulsive – Individuals in this group were less likely to experience inattention and more prone to hyperactivity and impulsivity. Brain deviations were concentrated in the circuits connecting the pallidum and the girdle turn, a region involved in emotional processing.
• Biotype 3: Primarily Inattentive – This biotype primarily struggled with attention problems. Effects were concentrated in a significant cerebral gyrus.

Potential Implications for Treatment

Researchers hypothesize that differences in neurotransmitter densities within the modified brain areas may contribute to these distinct biotypes. Further research is needed to confirm this hypothesis. If validated, this could lead to more targeted ADHD therapies, tailored to the specific brain patterns and symptom profiles of individual patients.

“If the suspicion is confirmed, this could open up completely new treatment options,” researchers stated. “Because then ADHD therapies could perhaps be better tailored to the individual patient – and, it is hoped, they could target more precisely where the disorders occur in the brain of those affected.”

This research highlights the growing understanding of neurodiversity and suggests that ADHD may not be a single disorder, but rather a spectrum of neurodevelopmental conditions.