There seems to be different types of stuttering and possibly multiple causes. The question that most of us ask ourselves, "is stuttering all in my head," "Is stuttering my fault?" Truly, yes, there is a mental aspect to stuttering. For myself, I rarely stutter talking to myself, but a job interview I'm a stuttering mess. So stress and anxiety exacerbate dislfuency. Yet this doesn't make it my fault. To me, it seems likely the problem is in the brain. So this debate of is it psychological or physiological, well I don't see why it can't be both. We know people can become fluent, so this implies a change in their speech neurons, and we can help shape these neurons with thoughts, actions, and other means. There are many more questions than answers when it comes to consciousness and the brain. There seems to be a stigma around the "self" and any sort of perceived mental illness. So there may be some shame that stutters feel, and that shame can definitely lead to more stuttering. So whatever the cause don't feel ever feel like it is your fault!