Imagine that there is a part of you that emerges for moments at a time. It takes over your body, your actions, your life — and when you come to, you have no recollection of what happened during its stay.

While that might sound strange, this isn’t an original premise by any means. Hollywood has recycled this narrative for blockbuster hits in the form of the “split personality disorder” trope. It’s an overplayed trope and a central concept to well-known horror movies ranging from the 1960 Alfred Hitchcock film “Psycho” to the 2016 M. Night Shyamalan film “Split.” Both movies, despite being released five decades apart, tell the same story: A serial killer, who seems relatively well-adjusted, is revealed to suffer from — surprise, surprise — a Dissociative Identity Disorder . The same con

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