What is Dissociative Identity Disorder?

Dissociative Identity Disorder is defined as the occurrence of two or more personalities within the same individual, each of which, during some time in the person’s life, is able to take control. This is not often a mentally healthy thing when the personalities vie for control. It’s also known as multiple personality disorder (MPD). In 1994, the American Psychiatric Association’s DSM-IV replaced the acronym MPD with dissociative identity disorder (DID).