Josef Breuer was an early colleague of Freud. His important contribution to Freud's thinking was:
1. the use of hypnosis to induce or relieve hysterical symptoms.
2. the technique of free association.
3. the idea of sexual motivation in behavior.
4. the idea that hysterical symptoms were psychological, and could be relieved by reliving or recalling emotion-laden events..
5. none of the above
Answer: 4