Final answer:
Psychology focuses on the role of a person's unconscious and early childhood experiences, as emphasized by Sigmund Freud.
Step-by-step explanation:
The subject that focuses on the role of a person's unconscious and early childhood experiences is Psychology. Sigmund Freud, a prominent figure in psychology, emphasized the significance of the unconscious mind in understanding conscious behavior. He believed that childhood experiences shape our personalities and behavior as adults, and that unresolved issues during early stages of development can lead to fixation and unhealthy personality traits.