Subject inclusion and exclusion criteria
| Inclusion Criteria | Exclusion Criteria |
|---|---|
| Age 18–70 years | Focal neurologic deficits |
| Availability for testing within 2 weeks of concussion | History of head injury (based on history and medical record) |
| Glasgow Coma Scale = 13–15 | Chronic posttraumatic abnormal findings on CT/MRI |
| Loss of consciousness < 20 minutes | Hospitalization due to the current head injury |
| Posttraumatic amnesia < 24 hours | History of a neurodevelopmental or neurologic disorder |
| English or Spanish proficiency | Major psychiatric disorder |
| Illicit drug use within 30 days |