Like Sigmund Freud, James was influenced by Charles Darwin's theory of natural selection.[56] At the core of James's theory of psychology, as defined in The Principles of Psychology (1890), was a system of "instincts". James wrote that humans had many instincts, even more than other animals.[56] These instincts, he said, could be overridden by experience and by each other, as many of the instincts were actually in conflict with each other.[56] In the 1920s, however, psychology turned away from evolutionary theory and embraced radical behaviorism.[56]
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