Do you realize it's neurological? The psychological aspect is just us trying to cope with our neurological issue. Which paradoxically causes us to stutter more and does the opposite what we want. Which might make it seem like it's only a psychological. My dad had a stutter and I do. There's obviously more to it than the surroundings because we grew up in a totally different surroundings. There's research indicating that our brains are different from people who don't have a stutter.