Multiple personality disorder is a psychogenic identity disorder, meaning a personality disorder caused by psychological factors. It involves "the existence of two or more distinct personalities within an individual, each of which dominates at a specific time. These personalities are independent and autonomous from one another, existing as complete selves."Generally, at any given time, only one identity exists within the individual's inner consciousness—the primary personality. During this phase, all emotions, thoughts, and behaviors operate according to the primary personality's patterns, showing no trace of another identity. At irregular intervals, typically following psychological stress, a sudden shift may occur to a completely different identity. All subsequent emotions, thoughts, and behaviors then align with the new personality's manner.At such times, the individual completely forgets the past identity, as if psychologically transformed into another person. The transition from one personality to another usually occurs abruptly. When the succeeding personality begins to "take charge," the original primary personality is unaware of it and forgets what happened previously. So, how is multiple personality disorder diagnosed?
Schizophrenia and multiple personality disorder are distinct conditions.
A complete personality structure resembles a fully assembled Rubik's Cube, functioning as an integrated, cohesive whole. In contrast, the personality of someone with schizophrenia resembles a Rubik's Cube whose individual cubes have scattered across the floor, the entire structure disintegrated.At this stage, patients often lose the boundary between themselves and the external world or others. Consequently, they mistakenly believe every action of others is related to them. While walking on the street, they constantly feel others are watching, monitoring, or following them. They may also believe their thoughts are known to others without sharing, or that others' thoughts intrude into their own. They might even feel their thoughts, emotions, or behaviors are controlled by others.Patients frequently develop unfounded or baseless ideas, such as believing certain individuals are plotting to harm them, or experiencing delusions centered on political or religious themes. In severe cases, their thought processes become entirely illogical, resulting in autistic thinking comprehensible only to the patient themselves.Externally, patients often struggle with self-care, may be seen muttering to themselves, exhibit unpredictable crying or laughing, perform odd movements, or maintain postures unsustainable for most people. Speech may become incoherent, responses irrelevant, and discourse disorganized. Patients are often easily recognizable from outward appearances.
In individuals with dissociative identity disorder, the personality structure remains intact and unified. However, much like the six sides of a Rubik's Cube, the patient's personality traits can switch and operate independently.