Johann Kaspar Spurzheim

Johann Kaspar Spurzheim was a German physician and a key proponent of phrenology. Phrenology is the study of the skull's shape to understand a person's mental faculties and character traits.

The core principles of phrenology, as developed by Franz Joseph Gall and later modified by Spurzheim, include:
* The brain is the organ of the mind.
* Mental abilities can be broken down into distinct faculties, each located in a specific brain region.
* The size of these brain regions, reflected in the skull's contours, indicates the strength of the corresponding faculty.

Spurzheim adjusted the names of these faculties to be more morally and religiously aligned than Gall's original designations. Although popular, phrenology has been scientifically discredited.12