although this is an older post...thought i'd throw my 2 cents in since i have autism as well

I find sativa's to be the best med...or sativa dominant as it is rare to find a pure sativa these days.

Many people with higher functioning autism/aspergers get anxiety/depression 2-3 times more then the average person

and melt downs/shutdowns only add to this...sativa's for me help me not focus on the things going on around but remain inside my mind and train of thought rather than becoming overly focused on too much noise, smell, or blinking lights....w.e. the case may be. Sativa's=mind high, Indica's= body high though mileage may vary. Indica's put me in a bad place and make me lazy, and then i focus on all the things that would caust a meltdown or shutdown. However as the other poster said each mind/body is different so really you have to try for yourself.