A Study to Test the SENSE Device in Military-Age Patients With Traumatic Brain Injury

Inclusion Criteria: * Patients who meet all of the following inclusion criteria will be considered candidates for study enrollment: * Male or female subjects age 22 to 50 * Patients with TBI who have a diagnostic head CT scan within 24 hours of the injury. * For patients with TBI without intracranial hemorrhage, Glasgow Coma Scale score at enrollment of ≤ 14. * For patients with TBI, intended clinical monitoring in the hospital setting for at least 6 hours from study enrollment. * Signed written informed consent by study subject or, if subject is unable, by subject's next of kin or legal guardian. * Willingness and ability to comply with schedule for study procedures. * Control subjects with normal brain health. Exclusion Criteria: * All subjects meeting any of the following criteria will be excluded from this study: * Female patients who are pregnant or lactating. * Known history of seizure or clinical seizure prior to initiating SENSE monitoring. * Open skull fracture. * Metallic intracranial clip, coil, or device (such as metallic ICP monitor). * Presence or history of any other condition or finding that, in the investigator's opinion, makes the patient unsuitable as a candidate for the SENSE device monitoring or study participation or may confound the outcome of the study. * Planned placement of an intraventricular catheter after the diagnostic (pre-enrollment) CT. * Planned withdrawal of care within 24 hours of enrollment. * Planned intracranial surgery within 24 hours of enrollment. * Current participation in a medical or surgical interventional clinical trial. * Planned or current use of continuous EEG monitoring. * Control subjects with normal brain health will have no known history of seizure, stroke, brain tumor, TBI