I recently found out that someone very close to me has ADHD, and so I've been researching it, but my research seems to be hitting a roadblcok. I'm seeing words that I have no clue what they mean, and any WEB search I do seems to come up dry. Can someone tell me what words like monoamine, dopamine, noradrenergic, and norepinephrine mean? Please help me, I really want to understand what all of this means!!!