Psychoanalytic theory views human nature as deterministic and driven by unconscious motivations and instincts. Sigmund Freud developed psychoanalysis in the 1890s as a set of philosophical descriptions of human nature, a psychotherapy method focusing on unconscious factors, and a theory of personality development through childhood stages. Psychoanalysis asserts that early childhood experiences stored unconsciously can lead to adult emotional problems. The unconscious stores repressed memories and continues to impact behavior, revealing itself in slips of the tongue, dreams, and other leaks from consciousness. Film spectatorship provides an illusion of power that derives from identifying with the all-seeing camera.