Whose pioneering work laid the foundation for the twentieth century psychological approach to understanding and explaining human behavior?

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Sigmund Freud's pioneering work in psychoanalysis laid the foundation for the twentieth century psychological approach to understanding and explaining human behavior. His theories on the role of the unconscious mind, defense mechanisms, and the psychosexual stages of development have had a significant impact on the field of psychology.

Whose Pioneering Work Laid the Foundation for the Twentieth Century