 Patients will not be eligible to participateconsent to participate in the study until they reach a Rancho Los Amigos level of 7 or 8. If there is any question as to a patients capacity to consent, the neuropsychologist andor psychiatrist involved in the study will assess the subjects intellectual and mental faculties prior to consent. Any confusional state prohibits a subjects from being rated as a 7 or 8. Additionally, in our experience, most patients are not able to undergo a full evaluation in the Walter Reed DVBIC program until they reach this level of recovery. Therefore, we anticipate that almost all patients evaluated in our program will have the capacity to give informed consent. 