(FORT LEE, Va.) March 11, 2010 - Concussion is the most common traumatic brain injury, according to the Centers for Disease Control and Prevention. The signs of concussion – clinically known as mild traumatic brain injury, or mTBI – are variable and can be subtle. A person may have a loss of consciousness and amnesia or see stars and feel dazed with no other symptoms.

TBI occurs when a blow or jolt to the head or a penetrating head injury disrupts the function of the brain. Blasts are the leading cause of TBI for active-duty military personnel in war.