They widely accept that there is correlation, that's it. Different brain activity doesn't necessarily cause stuttering, it can be a contributing factor though. Bad habits and fear can make new neural connections, and then we call it "neurological differences". Well, after 25 years of practice, he found patterns, I dont think it's anecdotal. The other authors found the same patterns. Really interesting. Yes, childhood can be without trauma, but patterns, memories, attitudes, can be partially inherited and partially learned. Try to look at your life without the element of stuttering, you'll realize that the problem is a group of problems, much deeper than speech. I believe that looking at stuttering as a neurosis is the right way, I wanted to give a few resources for you people to explore and see what I mean. Thanks for sharing your opinion.