The majority of kids with ADHD have an executive function disorder - they literally cannot control themselves. They may KNOW what they are meant to do, but they just can't.
The way you put this really struck me as to how difficult it must be for the kids who experience this. Gifted kids are used to knowing and doing. It must be really frustrating for them that they know but can't control certain behaviors. One time my DS said to me that he really wanted to pay attention and finish some tedious task but his mind just would not let him.
