Pretty interesting. The other thing Scal doesn't mention is that when guys are coming back from concussions, there is a competitive resistance built in to fight acknowledging those symptoms. You can't ice it, can't heat it, can't massage it, can't really rest it. Its kind of like being sick, but there is no temperature you're running. So you try and pretend that its not there, the first time at least.
At least that's been what I've seen from friends who got concussed playing football or rugby.