>> well, the helmets have undergone a lot of changes and improvements, and helmet design is important. but in my opinion, helmets aren't the whole answer. i think we need to work to take the head impact, the motion of the brain inside the skull out of the game. >> larry: does it -- in the nfl, they're fearing it may shorten life. can it? >> well, you know, we have autopsied quite a few athletes who have had a shortened life because of this syndrome. again, i support football. i think it's america's greatest sport. we want to make it safer. in certain cases there have been long-term detrimental effects of multiple concussions. >> larry: thank you, doctor. we'll be calling on you again. fascinating study. chairman of the department at west virginia university school of medicine. back with our panel after this.