This week on Only A Game we’ll examine the new athlete-driven initiative to study the long-term effects of concussions. Also, meet the teenage pro soccer player whose path to Chivas U.S.A. began with a stop on a reality T.V. show, and all the latest Major League Baseball Playoff developments. Audio for http://www.bu.edu/wbur/storage/2008/10/onlyagame_1004.mp3