. >> when dr. mckey autopsied, aaron hernandez, who killed himself after co murder, she found the most severe case of cte ever in someone under 30. now, she is seeing a similar pattern in deceased veterans. who experience a different kind of head trauma, combat blasts. of the 102 veterans brains dr. mckey examined 66 had cte. how is it that combat veteran who may be just experienced a blast has the the same type of injury? >> this blast ininjury causes tremendous ricochet or whiplash injury to the brain inside the skull. that's what gives rise off to the same changes that we see in football players as in military veterans. >> blast trauma was first recognized back in world war i. known as shell shock, poorly protected soldiers often died immediately, or went on to suffer physical and psychological symptoms. today, sophisticated armor allows more soldiers to walk away from an explosion. but exposure can still damage the brain. an injury that can worsen over time. >> it's not a new injury. but what's been

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dr. mckey's work with testing with mice. >> in the trauma laboratory. >> inside his boston university lab. goldstein brilt this 37-foot blast tube and a mouse in this demonstration. a mouse and model its exposed to explosion equivalent to ieds used in iraq and afghanistan. >> when it reaches 25 this thing is going to go. dr. goldstein's model shows the what is going on inside the brain, during a blast. the brightly colored waves illustrate stress on the soft tissues of the brain. as it ricochets back and forth within the skull. >> what we see after the last exposures, they looked fine. which, shocking to us. they come out of -- what is a near lethal blast exposure. just like our military servicemen and women do. and they ha peer to be fine. what we know is that -- that that brain, is not the same after that exposure as it was, microsecond before. and if there is a subsequent exposure, that change will be accelerated. ultimately this triggers a ne o neurodegenerative disease. in fact we can see that even after one of the exposures. >> the department of defense, hundreds of thousands of sol