05/17/2026
“Three “biotypes” of ADHD emerged and aligned with existing ADHD symptom ratings for children, but in unique ways with nuanced understandings of what's going on in the brain:
Biotype 1: The severe-combined with emotional dysregulation group, which manifested the more elevated and persistent symptoms, including a greater likelihood of mood disorders, although this likelihood was not statistically significant compared with Biotypes 2 and 3.
Biotype 2: The predominantly hyperactive/impulsive group, with such disinhibited behaviors driven via dysregulated action-mode networks.
Biotype 3: The predominantly inattentive group, with implications that default mode network interference contributes to poor sustained attention.”
What if we could directly ask the brain about ADHD? A recent study used innovative techniques to do just that.