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Reflect on Split-Brain and Dissociative Identity Disorder.
In the United States, there is a high incidence of individuals that have more than one identity. In fact, it is not uncommon for an individual to be unaware of his own alternate identities.
Such a condition is known as Multiple Personality Disorder or MPD. It was first named by Eugene Bleuler in 1908.
It is a disorder in which the identity of an individual changes. There are many different manifestations but they all share one common feature: there exist within the same body more than one personality that alternates control over behavior.
One of the most famous cases is that of Eve White and Eve Black, two different personalities who were both aware of each other.
There are also cases in which two personalities co-exist, but one of them is unaware of the other. That was the case with Sybil Dorsett who had 16 distinct identities.
In rare cases, the alternate personality is not known to either the subject or anyone else (a so-called "hidden observer" identity).