Throughout the study consciousness will be measured using the Glasgow Coma Score (GCS) from the time of presentation to the ER and two times each day until the patient is discharged from the NICU or ICU (routinely done on TBI patients). The Injury severity scores (ISS) will be recorded from admission (done on all trauma patients). Recovery of consciousness will be determined by measurement of the acute physiology and chronic health evaluation (APACHE) III modification of the Glasgow coma score to allow for scoring of the verbal component in intubated patients. Patients will be judged to be awake when the Glasgow coma score was > or = 12.