I can not maths in my head. Yep I can program one those fangle computer things (Some people think they might get popular). I have a long time interest in all of things like encryption it sounds so random to me. Then sometimes I want to speak but no words come out. I know what want but not able to say it. Very annoying when waiting in line at MuckyD's finally it my turn to speak. The no words come out. The more I try the more impossible it becomes (I need to lose few pounds anyway). Thow I have told MANY time before they just wish I would talk less then about those computer things.Walking down street and police/fire/ambulance siren goes off I have to put hand up against my ears. But I am able to deal with it because few moments they will hopeful be long gone. Then I am able to go loudest event and have no problems with it and able to enjoy it.
Then have a uncontrollable need to took at everything in room. But finding next to impossiable to look at persion face.
I cannot do mental maths either. I never have been able to it’s all rubbish to me! And yet, like you I am quite competent at any degree of computer science. Which is plain bizarre as it’s all numbers
The issue for me is this. Just because I can do x they don't understand why I can't do y as can do x ,which rather same thing. Then I get told your using Autism as excuse. Also I am rather intrested in this phenomenon. The reasion's why can do x then no y it just dosn't compute.