Sigmund Freud's original theory of instincts was profoundly influenced by:

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Sigmund Freud's original theory of instincts was heavily influenced by Charles Darwin's theory of evolution. Freud believed that human behavior was determined by innate drives or instincts, and that these instincts were shaped by natural selection over the course of human evolution. He saw human beings as creatures who were constantly struggling to satisfy their instinctual needs and impulses, and who were often driven by unconscious desires and impulses that they were not aware of. This view of human nature was strongly influenced by Darwin's theory of natural selection, which emphasized the importance of genetic variation and adaptation in the process of evolution.

Sigmund Freud's Original Theory of Instincts Was Profoundly Influenced By