Perhaps there is no more important safety issue facing riders than the frequency they suffer concussions and the long term residual effects of those. A while back I wrote an article on this very subject and the progress being made at that time. You can read that article here:
It is great to see continued progress in this area. The NFL and Hockey were the first two sports to really expose this problem, albeit perhaps not as willingly as some of us would have liked to see, but it has been ran issue in boxing and now MMA fighting as well. Our sport is taking this issue seriously as they should be.