I am trying to understand stimming or "self stimulation". Some information I have read and people I have spoken to say it is something the autistic individual does to bring control back to their world in either an unfamiliar or stressful situation. When Khaled is running in front of the mirrors looking sideways, or pacing the house humming or singing, he seems unable to stop. They say autistic individulas do this to stimulate their senses in some way.
Some people say it is their lack of communication and absence of appropriate play or activities to keep them occupied that results in repititive self stimulatory behavior. If you teach a child appropriate play and change your reactions to this behavior you can reinforce appropriate behavior and extinct stimming.
Although I am only at the beginning of this puzzle that takes parents and professionals lifetimes to only begin to understand, I don't think you can ever completely get rid of stimming.
With the advent of MRI and more studies in to the human brain, some people have argued that the autistic brain is wired differently to typical humans and higher order brain functions like sensation for example are developed very early in the autistic child. Due to this difference they are unable to block sensory input.
I obviously need a lot more research and reading. There are just so many books it will take me forever, but then I have absolutely nothing better to do with my life than to find out more about my son.