Actually, I have a friend who is like this and it doesn’t seem to stem from anything other than congential unable-to-STFUedness. He doesn’t particularly like the fact that he can’t get to the point in less than four verbal exchanges, and fully acknowledges how frustrating it is for people around him. He’s not stupid, but he just can’t seem to get thoughts organized in his head in a way that most other people do, and he can’t seem to let go of a thought without double- and triple-checking that it’s been settled (out loud, of course). But he can’t control it, so he just asks people to be tolerant and explicitly tell him to shut up when necessary.
In his case, it’s definitely learned behavior. We make fun of him for it, so one day, he pulls out his cell phone and plays us a message he had gotten from his dad:
We all just about peed ourselves laughing.
mischievous