and work with the brain's ability to heal and reduce the secondary injuries that might occur from hypoxia or low oxygen or low blood flow or the rest. i think for mild traumatic brain injury, the window is a little bit longer. it's 48 hours. and i applaud the cdc and others to try to get that awareness out there, that early recognition or response is needed. but i want toel cha, if i may -- give you a challenge that we're experiencing. the growing awareness for early recognition has really turned into some real challenges by parents who want some answers. they want to know things like after how many concussions should my child be removed from contact sports? for how long are injured brains vulnerable to a second impact? does the risk differ by age, and why did my child get a concussion when they were wearing a helmet? our science today does not answer these questions. clinicians on the front lines are also asking questions. i think you might find this interesting. visits for concussion, because of awareness, have skyrocketed at the children's hospital of 458% since 2009.re network. we're

. >> about the crash, the report said haney did not likely to experience hypoxia. how were you able to determine that's to after -- to determine that at two weeks after that? >> i will attempt to answer that for you. after the summer when more of the aircraft equipment was recovered, the board was able to reproduce the final minutes of the accidents, and in that reconstruction, there is every indication to the board's believe that captain haney not incapacitated, that he was focusing on the complex emergency that general lyon described, and match analyzed at tension led to his disorientation and failure to recognize that's prior to impacting the terrain. the reconstruction of what the aircraft was doing, the inputs aircraft controls, made the board's belief he was not incapacitated and ultimately it was disorientation. >> so for 29 seconds, he did not make any inputs? for an experienced pilot, he does not do anything? >> that we use a personal example, with over two dozen hours of flying the f-60. you're focused on that emergency, and there are times when we are su

>> if we look to the incidents, what we will find as we have a series of hypoxia like incidences or. we would expect them to be sent 25,000 or below but not an instance like this. we have pretty good assessments and tests. we have some altitudes you would not have expected as have other aircraft by the way, not just the f-22. is their someone who isn't a pilot, can you describe. just the crash of the f-22, and it's. usually identified by the crew member come usually recognized as a result of the training to see what would happen if they begin to not get the oxygen they need it. we actually train that on the ground. we have altitude chambers we take people up and they take the mask off and they begin to see their color goes down, they begin to get lightheaded and feel woozy, a headache, something like that. so the understand what their symptoms are, and the physiological the incident than as a condition where the public recognizes that something is not working exactly right with respect to his understand the environment cannot control the aircraft, were his senses of normalcy. they ca