Concussion and Post Traumatic Stress in Traumatic Brain Injury

The purpose of this study is to test the validity of this eye tracking algorithm for detecting structural (visible on CT scan) and non-structural (concussive) brain injury. The study will recruit brain injured subjects and non-brain injured controls from the Bellevue Hospital Emergency Department and neurosurgery services for eye-tracking as well as studies that assess the extent of brain injury. The investigators will determine if disconjugate gaze on eye tracking is significantly associated with abnormal functional, neuro-cognitive, and psychiatric outcomes. The investigators hypothesize that individuals who demonstrate sustained disconjugate gaze on the eye tracking task from the time of injury to 1 month will have elevated functional impairment in multiple domains of life (work, interpersonal relationships), will be poor performers on neuro-cognitive tasks (working memory, executive functioning, verbal memory, impulsivity), and will be significantly more symptomatic of posttraumatic stress disorder (PTSD) and depression than those who demonstrate conjugate eye tracking in the normal range at one month. Achievement of the investigators aims will provide the first evidence that eye tracking is a valid physiologic outcome measure for brain injury.