My wife has gotten our daughter into a program called Brain Highways, that may help a child cure their autism, or other similar conditions. The program costs around $2000 (as of a few years ago), done at home, parents guiding their children through physical therapy.
Their science says that there are three sections of the brain. The lower brain controls all involuntary body functions. The upper brain controls thought and memory. The middle part of the brain controls things that we have control over, but handles them on a subconscious level. So, when I run, I don't think (step, step step), I just start running. Some functions controlled by this part of the brain have to do with focus, processing and understanding the surrounding environment, controlling body activity, etc.
What their science claims is that a person who has an underdeveloped middle brain has to compensate by forcing the upper brain do handle these activities, but it's not very good at it. And since the upper brain is distracted into focusing on the mid brains role, it can't do what it's supposed to. Fortunately, you can train the brain to finish it's middle brain development by doing some therapy that emulates some of the activities that babies do when they lay on the floor (perhaps the rise of autism has been caused by parents holding their children a little too much instead of giving them exploration time on the floor?). Specifically, they teach a series of motions where the child rolls over a couple of times in a particular way, lays on the floor and moves their arms and legs in proscribed patters, then pulling themselves across the floor on their bellies. They progress naturally from dragging themselves inch by inch using just their hands to adding toes, then eventually using their whole legs and flying across the floor.
Our oldest had the greatest deficiency, has been very resistant to doing the work, and she hasn't completely overcome her limitations, and my wife hasn't forced the issue due to her resistance. Our second was about half developed, and has completed the program. Our third was completely developed before she started.
Our oldest has also made some progress using sound/body therapy, called Interactive Metronome, to speed up her brain and synchronize it with her body. This therapy involves the subject listening to a sound on head phones, and timing motions to trigger a button (attached to wrists, or positioned on the floor) in time with the beat. The longer somebody practices, the more they will be able to get the right timing, the more in sync the body and the brain, and the faster the brain will work. Some parents we know have reported significant developments in focus and faster thinking. We haven't progressed as far with this because it's about $1200 per semester, so we've only made it about halfway up the progress tree, and now our therapist is moving 500 miles away to live near family. There is software to do this at home that can be purchased, and I'm probably going to tell my wife to buy it soon.
Once a child is fully integrated, with a fully functioning brain, there is some catch up time as they progress through normal development stages that they've lacked. But eventually, most children should be able to function completely normally.