Environmental stuttering/ some thoughts.

Environmental stuttering/ some thoughts. Hello, I have found that when I am speaking by myself and reading aloud in my room that my stutter is 99% gone. The reason I bring this up is that I have been reading that it is a fault with our brains in terms of blood flow to the Broca area of the brain. If this was the case then surely we would Stutter all the time? I have also read that it was a genetic trait, however, having an identical twin that doesn't stutter sort of throws that off. On another note, I am reading Lee G Lovett's book ' Stuttering and Anxiety self cures' I have heard he is offering free skype sessions to anyone who has read the book, I might give it a try and get back to you all with any results.