Hey Mark, I liked that article, too.

Question, though...a little while back I put forth a theory that at least some of the damage from a brain injury might not be physical. I used the analogy of a virally-damaged computer hard drive, where there is no physical damage per se, but extensive alteration of the programming.

You seemed to assert that the damage must be purely physical, a matter of Diffuse Axonal Injury, and only undetectable due to the current limitations of our scanning technology. This article seems to support my theory, in that the aberration can be process-related rather than structural in nature. Any thoughts?

Here's the paragraph in question...

A normal CT scan rules out a concussion. [FICTION] "A concussion results from a neuro-metabolic event brought on by the trauma," Hummel said. "Simply put, there is an imbalance of the needed chemicals or fuel that helps the brain function when an athlete is concussed. That's not a structural injury, so a CT scan won't pick it up. CT scans can only view structural damage."