Yeah, we don't understand nearly enough about the brain to have a very mechanistic view of ADHD. With so many different types on a spectrum, and sometimes sympt

Yeah, we don't understand nearly enough about the brain to have a very mechanistic view of ADHD. With so many different types on a spectrum, and sometimes symptoms being caused by things like physical trauma or infection, it is likely there are different possible mechanisms. However, it certainly appears like dopamine is highly involved, but noepinephrine also seems to be involved as well. Medically, it is defined symptomatically, and not mechanistically.