How did Gall Identify his 27 Faculties?

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Franz Joseph Gall (1758-1828), a founding father of phrenology Phrenology was the pseudoscience of identifying a person's character and mental abilities on the basis of skull morphology (“bumps on the head”). The enterprise was based on four assumptions (Gross, 2009): intellectual abilities and personality traits are differentially developed in each individual these abilities and traits