I just checked out the June 7, 2013 report of the study. It said "They calculated that one-third of the neurons in the hippocampus are regularly renewed throughout life, amounting to the addition of roughly 1,400 new neurons per day, with the rate declining modestly with age."

It is interesting to hear the renewing of cell in the hippocampus. With the load of duties the hippocampus has, it is hard to imagine a concussion where the hippocampus does not have regeneration abilities.

The research also shows that this renewal ability decreases with age. That suggests that this renewal is a naturally occurring process and not a direct response to injury. It would be interesting to study the brains at the Sports Legacy Institute for the same C14 vs C12 differences. Would it show any renewing that is consistent with injuries ?

Too bad the hippocampus is such a small part of the whole brain. The researchers studied the hippocampus because it is the only area that suggested this renewing process. Maybe there will some day be a gene therapy to pass this renewal trait on to the many other classes of neurons.

The hippocampus is a primary part of balance and spatial awareness. Could it be that the hippocampus is a common area to be injured by a concussion ?

Lots more research is needed.