Mary was my first encounter with dissociative identity disorder (DID), which at that time was called multiple personality disorder. As dramatic as its symptoms are, the internal splitting and emergence of distinct identities experienced in DID represent only the extreme end of the spectrum of mental life.
Bessel A. van der Kolk, The Body Keeps the Score: Brain, Mind, and Body in the Healing of Trauma
dissociation, dissociative-identity-disorder, mental-health, mental-life, multiple-personality-disorder