Just observe PWNS, and try to mimic them. They dont think how to speak, until the their idea comes out. Their brain are functional to do that with as less effort as possible and they actually enjoy the conversation. We dont stutter when we alone right? So why we stutter when speaking in public situations, in front of strangers or on the phone call. In my opinion, the most of PWS are overthinking-er, our brain need to handle a lot of information and that's required more energy, so it could not be functional properly. Sorry for my english.