Traumatic brain injury (TBI) can occur when something outside the body hits the head with significant force. Whether it is a head hitting the windshield during a car accident, an impact from a fall, head injuries received during sports or other recreational activities , or trauma from a nearby blast or explosion, TBI can cause changes in a person’s ability to think, control emotions, walk, or speak, and can also affect sense of sight or hearing.
http://maketheconnection.net/conditions/traumatic-brain-injury
