The study of bumps on the head and protrusions of the skull as being evidence of the cause of deviant behavior, such as mental illness, crime, and violence, is referred to as physiognomy.

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Quizplus · Accepted Answer

The study described is called phrenology, not physiognomy. Phrenology is the pseudoscience that involves the measurement of bumps on the skull to predict mental traits, while physiognomy is the assessment of a person's character or personality from their outer appearance, especially the face.

The Study of Bumps on the Head and Protrusions of the Skull