this necessarily results in a particular, individual choice and pattern of apperception. These aptitudes can be shown to be inherited instincts and preformed patterns, the latter being the a priori and formal conditions of apperception that are based on instinct.
Jung argues that archetypes constitute the a priori formal conditions of apperception, giving the newborn psyche its determinative shape before any experience accumulates.
, The Archetypes and the Collective Unconscious, 1959thesis