There's also neuroplasticity, the ability for one to rewire their brain pathway instantly using psilocybin. I have personal experience with this, I had a bad stutter all my life, couldn't say two words without tripping on them. In my early twenties, after several "trips" I started noticing a deeper level to the experience that I wasn't able to experience in a social environment, what I mean is, the group I was with would ruin the experience, eg: I would be having a profound spiritually fulfilling experience, only to be forced back to the environment of the group because "something was funny or weird". Then, I did it on my own, I still had a bad stutter at this time too. I ate four grams of liberty caps and went outside in the woods around my house, found a spot and laid down to enjoy the experience. Awhile later, I started thinking about my life, purpose, God...then it hit me, why do I stutter? My tongue is not deformed, it should work properly, then all of a sudden I had this strong epiphany, I realized it was all in my head and I started to laugh. I never stuttered again after that night. I researched stammering too, there is no cure. They have no idea why it happens. The best options provided to you are speech therapy and anxiety medicine. I picked mushrooms in the cows fields around my home, ate them, and now twenty years later, I still do not stutter. I wanted to share this story with you brother, take care. HH o/ edit - typos