1. The branch of medicine that deals with the diagnosis, treatment, and prevention of mental illness; etymological meaning: "mental healing" or "healing the mind".
2. The study of the origin, influence, and control of emotions. This involves investigating the factors both from within and without that alter emotions and motivation. Such analysis provides a basis for judging regression or progression.
3. The medical specialty concerned with the diagnosis and treatment of mental disorders.

A school of psychiatric thought concerned with the medical treatment of mental disorders; especially, through medication, and emphasizing the relationship between behavior and brain function and the search for physical causes of mental illness.

The study of the effects of culture on psychiatric disorders and their manifestations.

1. The use of psychiatric knowledge and techniques in questions of law to determine legal insanity.
2. Psychiatry in its legal aspects including criminology, penology, commitment of mentally ill, the psychiatrist's role in compensation cases, the problems of releasing information to the court, and of expert testimony.

1. Psychiatry that relates mental or emotional disturbance to disordered brain function; neurology and psychiatry as a single discipline.
2. The specialty dealing with both organic and psychic disorders of the nervous system; this is an earlier term for psychiatry.

Behavioral neurology and neuropsychiatry are disciplines within the clinical neurosciences that focus on the clinical and pathological aspects of neural processes associated with cognition, emotion, and behavior.

Advances in structural and functional brain imaging, clinical electrophysiology, and experimental psychology over the last decades produced a significant growth in the clinical neurosciences, and changed fundamentally the manner in which normal and disturbed cognition, emotion, and behavior are understood clinically.