Neuropsychology is related to the applied science of brain-behavior relationships. This area incorporates principles of assessment and intervention based on scientific research on human behavior and abnormal functioning of the central nervous system. Neurodegenerative diseases are incurable and paralyzing conditions that result in progressive degeneration and/or death of nerve cells. This generates problems with movement (called ataxias), or mental functioning (called dementias). Assessment includes neuropsychological tests, patient history, qualitative observation, neuroimaging, Bender Visual Motor Gestalt (BVMG) Test, and diagnostic procedures.

Neuropsychiatry is a branch of medicine that deals with mental disorders which are disorders caused to the nervous system. It precedes the disciplines of psychiatry and neuroscience, which have a common training, however, psychiatry and neurology subsequently split apart and these are typically practiced separately. A neuropsychiatric is a psychiatrist who is a specialist in the diagnosis and treatment of disorders affecting the brain which cause a change in behavioral, psychological, and psychiatric symptoms, psychiatry is defined as the mental health of a person.