Please consult your doctor before trying anything. Note that this only works on a case-by-case basis.
If you have any doubts about this story, please use facts and reasoned arguments in your inquiries to get a response.
It was done by using botox to reduce sensory overstimulation caused by an overactive forehead muscle I had. Read the details on the blog of Dr. Manuel Casanova, a University of South Carolina Professor: https://corticalchauvinism.com/2016/07/21/yuval-levental-plastic-surgery-and-autism/
Follow-up and documentation of temporary side-effects: https://corticalchauvinism.com/2016/10/17/yuval-levental-autism-and-the-pursuit-of-knowledge/