Traumatic brain injuries (TBI) are responsible for the deaths of approximately 50,000 Americans each year and the hospitalizations of roughly 230,000 more. Many more victims go undiagnosed. Auto accidents are one of the leading causes of TBI. Most TBI's are closed head injuries, which means that trauma sets the brain in motion inside the skull. The brain gets slammed against the interior surface of the skull, resulting in contusions and swelling. Trauma can also initiate rotational forces that twist and stretch the brain, which can damage axons. Brain neurons send messages via electrical impulses; axons are the carriers of these impulses. When axons are damaged, brain function is diminished. A condition called diffuse axonal injury (DAI) occurs on a cellular level and leaves blood vessels and major brain structures intact. This type of damage cannot be detected by MRIs or CT scans, making DAI vastly under diagnosed and under treated. Brain injuries are u...