Do I look like I'm backtracking? I elaborately interpreted two studies, whereas you mention two figures and link an entire paper the topic of which is 21st century advances (not even what is here in question) without providing even the proper citation so that I can address and meaningfully reply to it. Incidence I mentioned nowhere. Some disorders are more debilitating than others. This link to schizophrenia you keep drawing up - the President of the most powerful country in the world stutters. What Presidents in US history were schizophrenic? If comparing stuttering to schizophrenia seems normal in your head, then there's nothing I can add. Nothing I particularly wanted or needed to know about blinking. I was interested in your take on it, but you seem to have a chip on your shoulder.