Which theorist was considered "radical" when describing his work on human thoughts and behaviors in the early 1900s?

Name: Which theorist was considered "radical" when describing his work on human thoughts and behaviors in the early 1900s?
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Question

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Sigmund Freud was considered radical in the early 1900s for his theories on psychoanalysis, which delved into the unconscious mind, sexuality, and the interpretation of dreams as central elements influencing thoughts and behaviors.

Which Theorist Was Considered "Radical" When Describing His Work on Human