A distinct meaning of alter ego is found in the literary analysis used when referring to fictional literature and other narrative forms, describing a key character in a story who is perceived to be intentionally representative of the work's author (or creator), by oblique similarities, in terms of psychology, behavior speech, or thoughts, often used to convey the author's thoughts.
[2] The existence of "another self" was first fully recognized in the 18th century, when Anton Mesmer and his followers used hypnosis to separate the alter ego.
[3] These experiments showed a behavior pattern that was distinct from the personality of the individual when he was in the waking state compared with when he was under hypnosis.
[4] Sigmund Freud, throughout his career, would appeal to such instances of dual consciousness to support his thesis of the unconscious.
[7] Heinz Kohut would identify a specific need in that early phase for mirroring, by another which resulted later in what he called the "twinship or alter ego transference".