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> why the researchers assume that this is an unresearched part of ADHD and not a different disorder entirely

Whether or not the extreme dysregulation is a different disorder in its own right or not, is not relevant here. They are grouping ADHD matches; clinically recognized ADHD presentations plus MRI recognized ADHD which have a distinct brain sub-pattern occurring in people that have the same distinct behavioral traits. ADHD frequently has co-occurring conditions.

"Identifying “specific subtypes” of ADHD will make it easier to treat these children effectively". Having a more objective way to diagnosis for things like that seems to be the focus of the approach. They expect it to keep evolving, so I wouldn't say they are assuming anything about absolute labels -- just grouping what they now know to be true, that certain external traits match certain distinct brain patterns that are within the larger adhd brain structure.

Also, I think it's not that it is "not treatable" as ADHD, it's that ADHD can be treated in many different ways and currently the wide variety of responses to such is still a black box. Adderall instant release could briefly make me tired, I would sometimes break off a small piece and use it as a sleep aid. Some other `treatments` (I prefer societal alignment coping aid) resulted in what seemed like an expensive joke. Subtypes may eventually be able to show which options work best for which types and to start there first, instead of the current default iteration.

This link adds more about their research. https://medicalxpress.com/news/2026-03-distinct-adhd-biotype...