Introjection: the process by which the functions of an external person are taken over by its mental representation, by which the relationship with a person 'out there' is replaced by one with an imagined person 'inside'. The Superego is formed by introjection of parental figures and it may be analyzed into a number of component introjects (the good/bad internal father/mother). Introjection is both a defense and a normal developmental process, depending on the context. Introjected parental figures act as guardians of a child until he or she can understand what to do in the absence of such guidance. In a mature mind, such introjects are inspected and they provide guidelines only, whereas in the immature mind, they operate subconsciously as inhibiting restrictions and enforcing controls (though they may also be rationalized consciously and be part of the subject's belief system). In healthy development towards maturity, introjects are a necessary transitional phase; however if normal development is hindered (the case with many people), introjects continue to control perception, attitudes, goals, and behavior. The Autonomous Ego is free from Superego programs.
http://www.trans4mind.com/mind-development/ego-autonomy.html