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Symptoms include a disruption in consciousness, memory, identity, or perception. It is a mental process which produces a lack of connection in a person's thoughts, memories, feelings, actions, or sense of identity. It is thought to be a coping mechanism -- the person literally dissociates himself from a situation or experience that's too violent, traumatic, or painful to assimilate with his conscious self.
What is Dissociative Identity Disorder (Multiple Personalities)