Macdonald triad

Set of behavioral characteristics hypothesized to be associated with later violent tendencies

The Macdonald triad, also known as the triad of sociopathy or the homicidal triad, is a controversial hypothesis that suggests a link between three childhood behaviors – animal cruelty, firesetting, and enuresis (bedwetting) – and later violent tendencies, particularly serial offenses. First proposed by psychiatrist J. M. Macdonald in 1963, the triad has been widely taught and remains influential in some circles. However, subsequent research has largely failed to validate the hypothesis, and it is now considered by many to be an urban legend. Specifically, the idea that bedwetting itself is connected to violence has been disproven.

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