Wil Joiner studies how people use different sources of information to aid behavior, ranging from visual perception to movement planning and updating. Specifically, he studies in how external and internally-generated sensory information is integrated in healthy individuals, in comparison to certain disease and impaired populations (e.g., Schizophrenia and upper extremity amputees). Achieving this understanding may lead to better methods for diagnosing and treating impairments of the nervous system.