Isaiah Kacyvenski, who played linebacker for the Seahawks from 2000-2006 is among a dozen pro athletes who have donated their brains to a medical study in hopes of providing new information into the long-term effects of concussions. Kacyvenski battled concussions throughout his Seahawk career. He joins a number of NFL athletes and other notable athletes, including U.S. soccer star Cindy Parlow in the study, which will be conducted postmortem (of course). more ›