Final answer:
Freud's psychoanalytic theory introduced the concept of the unconscious mind, which has had a lasting impact on psychology.
Step-by-step explanation:
While most of Freud's ideas have not found support in modern research, we cannot discount the contributions that Freud has made to the field of psychology. One big idea that has survived Freud’s psychoanalytic theory is the concept of the unconscious mind. According to Freud, the unconscious is a reservoir of repressed memories, desires, and conflicts that influence our thoughts, feelings, and behaviors. This idea has influenced the development of other psychological theories and therapeutic approaches.