Multiple Personality Disorder
Macee Hartt, 10/13/2015, Health- 6th
What is Multiple Personality Disorder?
a rare disorder in which two or more personalities with distinct memories and behavior patterns apparently exist in one individual personality. Some psychologists and psychiatrists believe that instances of demon possession recorded over the centuries may have really been MPD, but the first complete account of a patient with multiple personality disorder was written in 1865.
National Alliance on Mental Illness