How to recognize and understand self-states, alternate states, true and false selves, multiple identities, etc

I think that the term self-state was popularized by Kohut (1971, 1977) and later used by the relational analysts, most prominently Bromberg (2009), as a way of organizing, speaking about, and structuralizing experiences concerning the self. From the Freudian perspective, "state of consciousness" is a related but more experience-distant concept, elucidated by Rapaport (1951) in his encyclopedic Organization and Pathology of Thought.