Freud proposed psychoanalysis as both a theory and a treatment tool at the end of the 19th century. Why were Freud’s ideas revolutionary?

Sigmund Freud developed psychoanalysis both as a psychological theory and a tool to treat trauma and mental illness. Psychoanalysis significantly expanded the purview of psychology by emphasizing unconscious processes and mental conflict. Its ideas and practices created both followers and critics, fueling a controversy about the object and practice of psychological science.

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