Freudian theory addresses the idea that sexual drive is force behind human decision-making. He developed various techniques to prove this and also analysed dreams to discover more about the inner psyche.
Meanwhile, Jungian theory orginates from Swiss psychiatrist Carl Gustav Jung, who worked much more extensively within the world of dreams. He referred to himself as a 'natural scientist' rather than one who dwelled on theory.
Reichian theory, from Austrian-American comes from a more radical psychiatrist and psychoanalyst in Wilhelm Reich, who looked at the character as a whole rather than separate symptoms or neuroses.