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Sigmund Freud introduced psychoanalysis and many theories that had a lasting influence on psychology. Learn more about Freud's life, theories, and contributions.| Verywell Mind
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Jean Piaget is a psychologist who developed a theory of cognitive development focused on intellectual development of children. Learn about Piaget and his theories.| Verywell Mind
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Learn how psychoanalysis, an approach to therapy that emphasizes childhood experiences, dreams, and the unconscious mind, has influenced the field of psychology.| Verywell Mind