Like Sigmund Freud, James was influenced by Charles Darwin's theory of natural selection. At the core of James' 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. 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. In the 1920s, however, psychology turned away from evolutionary theory and embraced radical behaviorism.
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