 Subdural electrodes have been used extensively to record ECoG activity following TBI and other forms of brain injury. Despite requiring an invasive form of recording, ECoG activity remains the only established means to monitor CSD events. Invasive neuromonitoring via subdural electrodes was first demonstrated in the 1930s and continues to be a commonly performed neurosurgical procedure for epilepsy monitoring. A recent retrospective review found an overall complication rate of approximately 9.1 with 0.6 of patients experiencing permanent neurological deficits following subdural electrode placement.19 Furthermore, there has not been a single infection associated with subdural electrode placement at the University of Minnesota Medical Center. In addition to allowing detection of CSD events, subdural electrodes will allow the identification of subclinical seizures, and, therefore may provide a clinical benefit to the patients who undergo subdural electrode recording. 