 Traumatic brain injuries TBI are a leading cause of long-term disability among combat Veterans. The most common and persistent sequelae after TBI are cognitive-behavioral deficits in executive control and attention functions. Such abnormalities may directly contribute to poor long-term outcomes as well as impede rehabilitation of dysfunction in other cognitive and motor domains. Effective treatments would potentially make a major impact in improving functional outcomes, but consistently effective treatments are not available. The overall goal of this research is to improve the investigators understanding of plasticity in brain function after TBI and to develop improved cognitive neurorehabilitation treatments. The intervention involves individual and group-based training in cognitive skills. 