A traumatic brain injury (TBI) is caused by a bump, blow, or jolt to the head or a penetrating head injury and disrupts the normal function of the brain. Each year, TBIs contribute to a substantial number of deaths and cases of permanent disability. Those who survive a TBI can face effects lasting a few days to disabilities which may last the rest of their lives. Effects of TBI can include impaired thinking or memory, movement, sensation (e.g., vision or hearing), or emotional functioning (e.g., personality changes, depression).