Traumatic Brain Injury. An acquired injury to the brain caused by an external physical force, resulting in total or partial functional disability or psycho-social impairment, or both, that adversely affects a student’s educational performance. Traumatic brain injury applies to open or closed head injuries resulting in impairments in one or more areas, such as cognition; language; memory; attention; reasoning; abstract thinking; judgement; problem solving; sensory, perceptual, and motor abilities; psychosocial behavior; physical functions; information processing; and speech. Traumatic brain injury does not apply to brain injuries induced by birth trauma.