 Specific Aims: Using advanced quantitative analyses of electroencephalogram recordings we will determine the nature of functional neural anomalies related to sustained attention and memory deficits evident after injury from blast. We will determine white matter anomalies that are unique to blast injury as compared to PTSD. We will also determine which aspects of blast-related functional and structural brain abnormalities are associated with adaptive functioning in post-deployment. The long-term goals for the proposed program of research are to improve the characterization of traumatic brain injury TBI due to blast, describe its essential features in terms of neural function and structure to improve diagnosis, and characterize mechanisms of recovery after blast-related neural injury to facilitate the creation of interventions that target pathophysiology. 