What's science current opinion about neuroplasticity regarding stuttering right now? Can it be a (partial) possible solution for curing stuttering? What's the scientific reason behind the phenomenon that many stutterers can speak fluently alone, or even with others while imitating an accent or speaking with an angry tone of voice? I've heard that MDMA is now used by some therapists treating patients with PTSD. Is it possible that in the near future similar (psychedelic) experiments will be performed on stutterers to treat the negative psychological aspects of stuttering?