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id - a person’s base impulses/instincts. Operates on the pleasure principle. Seeks to fulfill basic needs like food, sleep, sex, etc. Also drives all autonomic functions like breathing, heartbeat, etc.
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Shadow - a dark reflection of the ego. This corresponds to the unconscious/shadow in 4 sides of the mind.
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Superego - the complete opposite of one’s own personality. Has the shadow’s cognitive functions, but in upside-down order (like the ego with the subconscious).