Multimodal Approach to Testing the Acute Effects of Mild Traumatic Brain Injury (mTBI)

Inclusion Criteria: 1\. Civilian (non-military) presenting to HMH ED. Exclusion Criteria: 1. Prior history of diagnosed TBI. 2. Other significant non-head injury/trauma or open wound. 3. Other significant medical co-morbidities, such as heart disease or cancer. 4. Self-reported current use or substances contributing to ED visit (e.g. illicit drugs, medications, alcohol abuse). 5. Currently diagnosed psychological condition (e.g. depression, PTSD). 6. Medications for psychological or neurological disorder. 7. Any implanted metal, such as medical device or braces on teeth. 8. Injury to the back or other injury that will make it difficult for the participant to tolerate tests. 9. Injury to dominant arm that would cause difficulty using computer or responding to stimuli during functional imaging. 10. Pregnancy.