Dr. Grant's research has been concerned primarily with the integration of eye and ear for speech perception in both normal and hearing-impaired populations using behavioral and neurophysiological measures. Current work in this area is focused on changes in cognitive load as a result of combining auditory and visual cues and the impact of age, hearing loss, and traumatic brain injury on one's ability to selectively attend to one or more targets in the presence of multiple competing auditory and visual sourves. In addition to his research on auditory-visual speech processing, Dr. Grant and colleagues at Walter Reed, and at the University of Maryland, College Park have been applying models of auditory processing to hearing-aid algorithm selection.