Multiple personality and hypnosis: the first one hundred years

Area of Science:

• Psychiatry and Psychology
• History of Medicine

Background:

• The Enlightenment fostered increased scientific inquiry into diverse human behaviors.
• The French Revolution (1789) marked the emergence of a notable case of what is now termed multiple personality disorder.

Observation:

• A local physician, Dr. Eberhard Gmelin, treated a patient with multiple personality disorder.
• Dr. Gmelin, newly interested in mesmerism, applied this technique to the patient.
• This intervention initiated a growing investigation into hypnosis for dissociative conditions.

Findings:

• The case provided early clinical insights into dissociative phenomena.
• It contributed to the nascent understanding of altered states of consciousness.

Implications:

• This historical case informs the understanding of the psychodynamic concepts of dissociation, splitting, repression, consciousness, subconscious, and unconscious.
• It underscores the long-standing exploration of hypnosis in treating complex psychological conditions.