February 3, 2012 5:48 pm Dr. Amen on Concussions Dr. Amen has examined the brains of over 100 retired football players. He sits down with Colleen Williams to talk about rehabbing the brain. US & World Videos 0:44 Security guard shot at $12 million Encino home 1:01 One person killed in crash in Porter Ranch 3:32 USC, UCLA students navigate end of the year protests 3:26 Confrontations occur at UCLA campus amid ongoing protests 2:44 Tommy Trojan statue cleaned after vandalism