Yep i still stand by my claims; "origin is neurological" and "majority is psychological" are no contradictions, the first stutter in your life can be caused by neurology and genetics but the exacerbation and the worsening and the self loathing and guilt and anticipation anxiety ; the majority of this is psychological . And yes ; origin doesnt matter if psychological interventions are helping people before my very eyes everyday. It is nice to know the "why " of something . But the "why" and the "how to treat" may be completely different games. You will tell me now " what is your scientific evidence that psychological interventions are working for a lot of stutterers ?" " i will tell you thats the flaw of our system there is no enough funding to research this in scientific trials but that doesnt mean we should raise our arms up in the air and just wait decades for science to unravel . When funding is scarce and survival is paramount , your back up is anecdotal evidence on the condition that the suggested treatment isnt harmful in any way . And then I repeat : CBT , desensitization, nervous system regulation, and assertion training will not hurt anybody if done with supervision. So why not try? Much love to you and thanks for you insightful conversation.