â€œA person with Multiple Personality Disorder (MPD) can have up to sixty legitimate alter-personalities of all types [suggest Dr. Allison]â€ (Allison and McKenzie). â€œMPD is a mental disorder in which one human has two or more personalities, â€œdefines Dissociation.Com-Allabout Multiple Personalities, a website by Dr. Allison and Marie McKenzie (who has MPD), giving information on Multiple Personality Disorder. Dr. Allison writes â€œthere had always been doubters that such a disease really existedâ€ ( Allison and McKenzie). In the psychological world, there is a major debate going on about whether MPD is in fact a true mental disorder, and there is also an argument on where MPD exists or not. Multiple Personality Disorder does in fact exist, and even though currently it is called Dissociative Identity Disorder (DID), it should not be, because the two mental disorders are slightly different.
Before the argument about the differences between MPD and DID is introduced, one needs to understand the MPD is in fact a mental disorder and understand the aspects of it. When Dr. Allison â€œdiagnosed his first case of MPD in 1972â€ there was no information