An alter ego (Latin, "the other I") is a second self, a second personality within a person, who is often oblivious to the persona's actions. It was coined in the early nineteenth century when dissociative identity disorder was first described by psychologists. A person with an alter ego is said to lead a double life.
A distinct meaning for alter ego can be found in literary analysis, wherein it describes characters in different works who are psychologically similar, or a fictional character whose behavior, speech or thoughts intentionally represent those of the author. Similarly, alter ego can be applied to the role or persona taken on by an actor or by other types of performers.
Alter ego is also used to refer to the different behaviors any person may display in various situations. Related concepts include avatar, doppelgänger, impersonator, and split personality.
[Wikipedia]
[Wikipedia]
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