North TX doctors seek more answers about concussions

Although nearly four million people a year sustain concussions, there's still a lot doctors don't know about them, including Dr. Munro Cullum. The neuropsychologist is one of the researchers at UT Southwestern Medical Center leading a study of several hundred people to eventually come up with better treatment for concussion. The current main treatment for concussion: "Rest. But we don't know exactly much rest is good and for whom. One individual may recover rather completely within hours, days. A small subset of individuals tend to show a little bit longer recover, and we need to better identify who those people are and what factors in their background might contribute to prolonged recovery. Or maybe even given us some indication as to might respond best to some specific treatment."