“Three years ago, researchers at Purdue University began monitoring every hit sustained by two high school teams. The goal was to study the effect of concussions. But when researchers administered cognitive tests to players who had never been concussed, hoping to set up a control group, they discovered that these teens showed diminished brain function as well. As the season wore on, their cognitive abilities plummeted. In some cases, brain activity in the frontal lobes—the region responsible for reasoning—nearly disappeared by season’s end. "You have the classic stereotype of the dumb jock and I think the real issue is that’s not how they start out," explained Thomas Talavage, one of the professors of the study. "We actually create that individual.”