Read this.
If this were true, then, according to Freud (not saying I believe it, but it is a whole different view to see psychology), along with their low impulse control, sociopaths (or at least antisocial PDs) are very strongly influenced by their id more than any other person, except people with extremely low IQs, I guess. Their superego may have a presence, but it would be ultimately dominated and made the bitch by the id. In sociopaths, the superego may not even exist at all, considering the lack of morality and any sense of right and wrong. They are prone to commit violent acts because it is seen as a reward, and their punishment system is all fucked up, so it is conditioned as a reward system.
Now, for high functioning socio/psychopaths, the id may not be so strong. If the superego is not there, though, the ego can not exist, therefore the id becomes the only force. If the id is not too strong and the superego is nonexistant, I hypothesize, along with Freud's theories, that this creates a high functioning sociopath.