Hi all I'm very knew too all this, my son is 7 and is currently going through an autism diagnosis.....which is taking absolutely ages. I've been trying too look up as much as I possibly can. But he does a high pitch screech when hes over stimulated..could be while watching the telly on his ipad xbox playing a game certain words....any one have any ideas as to what and how too deal with this its soo high pitch.....thanks