Automobile accidents account for half of all brain injuries in the U.S. according to Statistics from the Center for Disease Control. A traumatic brain injury occurs when an impact to the head disrupts brain functioning. After a brain injury, the length of recovery varies from person to person and there are many factors that affect the prognosis. Although, the most noticeable improvement happens in the first six months, it is common for a person to steadily improve over a two year period after an injury.
Factors that affect the recovery process include the type and severity of brain injury, the age of person injured, medical history, depth and duration of injured person in a coma.