I think a good way is to start a band where, let's say, good vocal has a vision to make up a band for exact project. 7 people - we came together at 2 mounth and after that had a normal gig - 80th rock covers. Now we continue with our own songs. I think this quite a good way to gain.
Brains controls every muscle, nerve, eyes, etc in humans body. Brains are difficult and not explained what, how and when. From his side, i would try to attend a neurologist as soon as possible.