Dissociative Disorders definition psychology
Definition Edit. Dissociative identity disorder is a diagnosis described in the Diagnostic and Statistical Manual of Mental Disorders, 4th Edition, Revised, as the existence in an individual of two or more distinct identities or personalities, each with its own pattern of perceiving and interacting with the environment.issociative identity disorder is a diagnosis described in the Diagnostic and Statistical Manual of Mental Disorders, 4th Edition, Revised, as the existence in an individual of two or more distinct identities or personalities, each with its own pattern of perceiving and interacting with the environment.