Final answer:
Sigmund Freud, a highly influential figure in the history of psychology, focused on how the unconscious mind motivates behaviors.
Step-by-step explanation:
Sigmund Freud, a highly influential figure in the history of psychology, focused on how the unconscious mind motivates behaviors. Freud believed that unconscious drives, influenced by sex and aggression, and childhood experiences are the forces that shape our personality. Freud's ideas about the role of the unconscious mind in determining conscious behavior have greatly influenced the field of psychology.