Don't really understand what your question is about, but I have some articles for you that might answer the questions you have concerning this subject:

http://www.brainline.org/content/201...halopathy.html (CTE)

http://www.sciencedaily.com/releases...0718171401.htm (neurodegeneration)

http://www.minnpost.com/healthblog/2...earch_suggests (sub-concussive blows)

-GlassHead