Macdonald triad by John Marshall Macdonald

  • Macdonald triad (triad of sociopathy) is a set of three behavioral characteristics associated with sociopathic behavior
  • It was first identified by J.M. Macdonald in 1963 and published in the American Journal of Psychiatry
  • Macdonald triad is formed by:
    • Animal cruelty
    • Obsession with fire setting
    • Persistent bedwetting past the age of five
  • It is linked to violent behavior, particularly homicidal behavior

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