Absolutely, thats why CBT therapy has been linked in dealing with stuttering. My anecdotal evidence is I had an epiphany that "typical" speakers dont approach conversations like we do. I had to retrain my brain to focus on what is happening rather than how I am going to sound or if i am going to block on X word. The corollary to this is that PWS tend to use "was i fluent?" as a main indicator of a successful social exchange.