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Concussion, the most common among traumatic brain injuries, which occurs 1.7 million times a year in the U.S., represents a major public-health problem.

Concussion, the most common among traumatic brain injuries, which occurs 1.7 million times a year in the U.S., represents a major public-health problem. It occurs when there is a sudden acceleration or deceleration of the head, a process depicted here in this animation

ByGwyneth Dickey Zakaib of Nature magazine it Parker doesn't just study traumatic brain injury in the lab, he's also seen it at close range while serving in Afghanistan. [More]

New research shows a link between older veterans who had a traumatic brain injury and an increased risk of dementia. Dr. Jennifer Ashton profiles a young Afghanistan veteran who could be at risk