Franz Joseph Gall asserted that the size of bumps or indentations on the skull reflected the size of the brain regions beneath and thus indicated personality traits.

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Franz Joseph Gall was a pioneer in the field of phrenology, which is the study of the relationships between the skull and personality or behavior. He believed that the shape of the skull and the size of bumps or indentations indicated the development of specific mental faculties and traits. While phrenology is considered a pseudoscience today, Gall's work was influential in the development of modern neuroscience and psychology.

Franz Joseph Gall Asserted That the Size of Bumps or Indentations