John,

I have only two points.

First, You refuse to accept that my comment of "In my PERSPECTIVE, it APPEARS" as what is says. I describe rigidity of thought for your information, not as an accusation.

Second, Rehabilitation specialists have found that accepting the current state of recovery as real is a starting point toward maximizing recovery. This is important because anxiety is the worst thing for recovery. The toxic brain chemistry caused by anxiety is counter to recovery. Plus, the lack of quiet rest where the brain relaxes and lets go of stressful thought allows the brain to apply its resources to recovery.

And, Yes, you are right. The research is not complete enough nor long enough to prove that over a lifespan, 100% recovery is not possible. It has looked at 10 and 20 year spans between known injuries and continuing evidence of the prior injury. But, as you say, it does not cover all persons so some may have recovered 100% without ever being examined. Unfortunately, the research to prove that 100% recovery is impossible. There are just too many variables to make such a study scientific.

Google "long term effect of concussions" and you will find lots of information. Most is related to those symptoms that are still noticeable. Some relate to dysfunctions that show even though there are no noticeable symptoms. You need to find the studies that have a broader cohort to find the most applicable information. You also need to find the studies where they found these abnormalities in what was thought to be a control (no concussion group) but in hind sight, the individual subject could point to a time where he may have suffered a concussion even though it was not a diagnosed concussion. I have hundreds of links to information.

Dorothy Gronwall did much of the pioneering research in the 1970's. Her work is not available online since her books are still being sold in print only. She died in 2001 due to a brain aneurism. You might find some excerpts online.

There is a phrase used by those in the know. "When you have seen one brain injury, you have seen ONE brain injury." There is strong evidence that shows one can not compare concussions. A 'mild' concussion in one subject may heal to no recognizable symptoms quite quickly and another even milder concussion can manifest symptoms for a prolonged period of time. This does support your claim that 100% recovery can not be excluded.

So, shoot for the moon. Maybe you will be one of those who has escaped detection and recovered 100%. Please keep in mind that anxiety is a big factor in slowing recovery so trying to live a low stress and anxiety free life is important.

My best to you.