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There's quite a bit of attention currently on the effects of repetitive concussion, which can lead to post-concussive syndrome and Chronic Traumatic Encephalopathy (CTE). CTE is most often linked with football and other contact sports, and occurs when the brain repeatedly sustains mild to moderate concussive impact, leading to accumulative micro-damage.

Behavior changes, like irritability, aggression, and difficulty with focus, are the most common symptoms. For a detailed look at this condition, check out the eye-opening book, "When Brains Collide," by Michael Lewis.

Conventional medical...