so here's this what part of the brain can give you ADHD: ADHD is associated with abnormally low levels of the neurotransmitters transmitting between the prefrontal cortical area and the basal ganglia i.e., dopamine and noradrenaline. Dopamine is closely associated with reward centers in the brain and also interacts with other potent neurotransmitters to regulate mood. I found this from a website. And ADHD has many symptoms including: Behavioral: aggression, excitability, fidgeting, hyperactivity, impulsivity, irritability, lack of restraint, or persistent repetition of words or actions
Cognitive: absent-mindedness, difficulty focusing, forgetfulness, problem paying attention, or short attention span
Mood: anger, anxiety, boredom, excitement, or mood swings
Also common: depression or learning disability
So yeah, that's how they confirm ADHD.