<Li> 1930--Edwin Boring discussed the Boring figure . </Li> <Li> 1931--Gordon Allport et al. published the Allport - Vernon - Lindzey Study of Values, which defines six major value types . </Li> <Li> 1933--Pyotr Gannushkin published Manifestations of Psychopathies . </Li> <Li> 1933--Clark L. Hull published Hypnosis and Suggestibility, proving that hypnosis is not sleep and founding the modern study of hypnosis . </Li>

What are the three great forces of psychology