Demonic Possession: The belief that psychological disorders were caused by evil spirits or demons taking control of a person's mind or body.
Humoral Theory: A theory that explained psychological disorders as imbalances in bodily fluids (blood, phlegm, yellow bile, black bile) which affected a person's temperament.
Moral Treatment: An approach to treating mental illness in the 18th and 19th centuries that emphasized compassion, respect, and providing a healthy environment for patients.