05 April 2019

5th April 1898 - Sally Beauchamp first hypnotised

On 5th April 1898, the pioneering psychologist, Morton Prince first hypnotised his patient, Sally Beauchamp, who he went on to discover had three distinct personalities. He traced the separation into distinct personalities to a trauma. Under hypnosis one personality would deny having said what another personality had said and so they appeared to be in some sense autonomous.

He went on to fully document the case of multiple personality in his book 'The Dissociation of a Personality.' Prince details the different likes dislikes and characteristics of the different personalities. He describes a house divided against itself with different personalities coming to the fore and doing incompatible things, and causing real distress to Miss Beauchamp.

Thanks to On This Day in Psychology by David Webb for the date

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