Final answer:
The Individualistic Theory in Freud's psychoanalytical model relates to the Ego, which balances the primal desires of the Id with the moralistic demands of the Superego.
Step-by-step explanation:
The Individualistic Theory in the Psychological -Psychoanalytical model, as proposed by Sigmund Freud, relates predominantly to the Ego. The Ego is considered the rational part of our personality, what Freud called the self, and is the part of our personality that is seen by others. It operates on what Freud termed the "reality principle". The primary role of the Ego is to balance the primal urges of the Id, which is based on the pleasure principle and seeks immediate gratification, and the moralistic demands of the Superego, which serves as our conscience and morality monitor, reflecting social rules for right and wrong. The conflicts between the Id's desires and the Superego’s rules are managed by the Ego in a realistic way, thus allowing individuals to function effectively within the realities of society.