who developed theories about the power of the part of the mind called the unconscious
Unconscious mind The concept was popularized by the Austrian neurologist and psychoanalyst Sigmund Freud. In psychoanalytic theory, unconscious processes are understood to be directly represented in dreams, as well as in slips of the tongue and jokes.
History of psychology Today, psychology is defined as "the scientific study of behavior and mental processes." Philosophical interest in the mind and behavior dates back to the ancient civilizations of Egypt, Persia, Greece, China, and India.[1]