experienced much more social disadvantage than whites. >> reporter: some medical professionals called the process outdated and oversimplified. >> it is inprecise, bad medicine, and it forwards false ideas about education and the color of your skin. >> reporter: black players had to score more poorly than white players on cognition tests. the claims process was approved by a judge after the league and the players' legal team reached an agreement. the players said they knew nothing about the race norming, including gordon. he played in the nfl for eight years, retiring in 2012. do you have any sense of how many concussions you may have gotten over that period of time? >> i have no idea. innumerable amounts. >> reporter: now, he suffers from headaches, anxiety, and panic attacks. >> imagine your brain being frozen until about noon. >> if we're lucky.