Correct, we don't fully understand stuttering. There appears to be physiological factors that contribute to stuttering. I recall seeing something regarding specific genes they are investigating. And there is most certainly evidence of hereditary situations related to stuttering. If you have any links related to stuttering and the left recurrent laryngeal nerve I'd love to get up to speed. And my experience is, by definition, anecdotal. But I struggle to recognize how tapping is anything more than a short term distraction. Something that disrupts the stuttering 'loop' until the brain adapts. Before becoming fluent, I cluttered my stutter with a lot of these sort of tricks. For a time, I found I could avoid blocks by closing my eyes briefly. Eventually my stutter adapted, and closing my eyes became part of my blocks. Or adding cheater words to be fluent. Until those cheaters became part of disfluency as well. My first use of the DAF (delayed audio feedback) device was kind of amazing. With a quick adjustment, I was perfectly fluent while using the DAF. Think "King's Speech" with the loud music preventing the stutterer from hearing their own speech. But I was hearing myself on a delay, breaking the disfluency feedback loop. I get a lot of pushback here when I say that speech is learned. It's a developmental process. Stuttering, whatever the cause, is also developmental. We see our stutter change over time. Achieving fluency, in my experience, was also a developmental process. Learning to speak fluently as a developmental process. It wasn't correcting the disfluency. It was more akin to training someone to speak from the ground up. We're on different pages with regards to stuttering being physiological. Other than in cases of physical trauma. It won't be treated medically. At least not as a primary treatment i.e. pill to cure stuttering. Keep us apprised of your success with tapping.