ADHD is Molecular

I read the ticker tape at the bottom of the screen during a segment with Toure on MSNBC. Idk who apointed this man pop culture guru, but anyway...
The scroll said that studies have shown that ppl with ADHD lack the proteins that enable them to feel a sense of reward and motivation. You know most of the things we do in life, we do it because of the expectation of some reward - an A+, a sense of pride, praise and recognition from others, etc. But they don't have a sense for those simple motivators. Their brains just aren't turned on by that stuff.
No study is 100 percent conclusive, I think, but it's an interesting theory.