Final answer:
William James was the major proponent of the functionalist movement in psychology, emphasizing how mental activities assist in adapting to the environment.
Explanation:
William James was the major proponent of the functionalist movement in psychology. Functionalism, influenced by Darwin's evolutionary theory, focused on how mental activities help organisms adapt to their environment. Other key figures associated with functionalism include John Dewey, James Angell, and Harvey Carr.
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