I don't get this post. The video is not talking about the root cause. The video is her conceptualizing speech blocks. She says that quite clearly in the first 30 seconds of her video. There is scientific research on a therapy approach that is psychosocial that she is describes in the comments on how she manages her own stutter: http://www.sciencedirect.com/science/article/pii/S0094730X12000617 You're argument lacks focus. It's arguing for the sake of arguing and a semantics circle jerk because people like you thrive on that. It's obnoxious and distracting those who have tried everything and are open to new ideas.