MENTAL STATE (PSYCHOLOGY) OF MEDIUMS Mediums may share similarities with people suffering from a pathological condition called dissociative or multiple personality disorder. One famous case would be Dr. Jekyll and his monstrous alter ego, Mr. Hyde.
The change of personalities is beyond conscious control, and the victim has no memory of what the secondary personality says or does. This personality may arise when in the wake of severe emotional shock of tragic experiences. The victim represses certain memories and feelings and physical symptoms such as headache, amnesia and insomnia may occur before the new personality appears.