An alter ego (Latin for "other I") means alternative self, which is believed to be distinct from a person's normal or true original personality. Finding one's alter ego will require finding one's other self, one with different personality. A distinct meaning of alter ego is found in 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 virtue of oblique similarities, in terms of psychology, behavior, speech, or thoughts, often used to convey the author's own thoughts. The term is also sometimes, but less frequently, used to designate a hypothetical "twin" or "best friend" to a character in a story. Similarly, the term alter ego may be applied to the role or persona taken on by an actor or by other types of performers.
The idea of alter ego originated from the studies conducted in 1730s by Anton Mesmer. Anton Mesmer noticed different behavior of people in their awake state versus hypnotized state. However, the term appeared in common usage in the early 19th century when dissociative identity disorder was first described by psychologists.Cicero coined the term as part of his philosophical construct in 1st-century Rome, but he described it as "a second self, a trusted friend".
Alter ego is also used to refer to the different behaviors any person may display in certain situations. People suffering from dissociative identity disorder aren't aware of their other personality while people with alter ego are aware and are driven by it.
Bo Jackson struggled as a kid controlling his emotions and because of his anger he would get in trouble. His competitive and retaliating personality would get him penalties. One day he watched a movie, Friday the 13th and from that day he took on the character of Jason when he would take the football field. Letting Jason take over helped Bo Jackson become a relentless and disciplined destroyer on the field.
Tiffany Gee Lewis feels she's a lazy person at heart which is her weakness. She practices an exercise by creating a picture of her alter ego by drawing and naming her. By imagining her alter ego she can point out the bad habits consciously and notice them when they appear in her lifestyle. This exercise allows her to eradicate unhealthy habits that are hard to get away from. 
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