What concept is Freud's most important contribution to the science of psychology?

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Freud's most important contribution to the science of psychology is his proposal of the concept of unconscious processes. He suggested that a large part of our mental lives, including thoughts, feelings, and memories, are kept hidden from our conscious awareness and can only be accessed through psychoanalytic techniques. This idea has had a significant impact on fields such as clinical psychology, psychotherapy, and neuroscience.

What Concept Is Freud's Most Important Contribution to the Science