This early work by Sigmund Freud was originally published in 1920 and we are now republishing it with a brand new introductory biography. 'Three Contributions t

In his later work, Freud proposed that the human psyche could be divided into three parts: Id, ego and super-ego. Freud discussed this model in the 1920 essay B

Freud's discovery of the preeminent role of sex in creating neuroses resulted in theories that changed the thinking of the world. He was a champion of greater s

The fact of sexual need in man and animal is expressed in biology by the assumption of a "sexual impulse." This impulse is made analogous to the impulse of taki