Sigmund Freud's psychoanalytic theory revolutionized psychology by introducing the idea that unconscious forces significantly shape human behavior. According to Freud, every psychological event is driven by deep-seated internal forces, often formed during early childhood. His theory, built on the premises of psychic determinism, symbolic meaning, and unconscious motivation, offers a unique perspective on the complexities of human behavior.

Freud's concept of psychic determinism asserts that unconscious internal forces determine all mental processes. He believed that nothing in the mind occurs by chance; instead, every thought, feeling, or action stems from unconscious conflicts. These conflicts can manifest in various ways, such as dreams, neurotic symptoms, and Freudian slips. Freudian slips involve unintentionally substituting one word for another, reflecting hidden desires or internal tensions. Freud emphasized early childhood experiences, particularly parenting, in shaping these unconscious conflicts. According to this view, a child's early interactions with caregivers profoundly impact adult personality and psychological development.

Freud proposed that even trivial actions possess symbolic meaning and often represent unconscious thoughts. For example, he might interpret a professor's accidental breaking of chalk as symbolizing suppressed desires, often of a sexual nature. This idea extends to seemingly insignificant behaviors, suggesting they may express deeper psychological processes.

Central to Freud's theory is the notion of unconscious motivation. He proposed that desires, memories, and conflicts in the unconscious mind drive most human behaviors. Although individuals are largely unaware of these hidden motivators, they significantly influence behavior and personality.

Freud emphasized the role of the sexual drive, which he expanded to encompass the broader pursuit of pleasure, not just physical sexuality. This drive, he argued, is a primary motivator for behavior, underlying many actions, thoughts, and emotional experiences.