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Phrenology is the idea that it is possible to establish facts about a person's psychology or morality, such as criminal tendencies, by measuring the size and shape of their head and feeling for any bumps.
Among the accomplishments attributed to phrenologists is the postmortem theft of composer Joseph Haydn's head.
Phrenology was based on a theory that specific parts of the brain control certain things (which is true), but rather than mapping brain activity as things like nerve responses, muscle control or memory, phrenological diagrams show parts of the brain governing character traits such as "acquisitiveness", "benevolence", "passion" and "mirth".
Although now dismissed as a pseudoscience, phrenology was important historically in that it recognised the importance of the brain in thought and behaviour, a concept which had been proposed before but had largely been neglected. However, phrenology's findings were based on misconceptions, speculation and anecdotal evidence, placing it in pseudoscience territory. It can be seen as a transitional discipline before the more empirical sciences of neuroscience and psychology studied the brain and the mind more accurately.
Despite being denounced by the mainstream scientific community, phrenological ideas have been used sometimes during the 20th century, particularly by some racial theories, which (wrongly) argue that differences in some races' skull sizes and shapes indicate low morality and intelligence.
The 1949 Bugs Bunny cartoon Bowery Bugs poked fun at this practice when Bugs (disguised as a mystic) talks about reading the bumps on his client's head. When his client replies he doesn't have any bumps on his head Bugs hits him there with a hammer.
- Entry in The Skeptic's Dictionary
- History of Phrenology page
- Phrenology: History of a Pseudoscience by Steven Novella
- Neural Networks Debunk Phrenology by Robert T. Knight
- Phrenology: Or the Doctrine of the Mental Phenomena by J.G. Spurzheim (a phrenology tract from 1846)
- Excerpts from and commentary on Vaught's Practical Character Reader, a 1902 "beginner's guide to phrenological madness" - Retronaut.com
- The Skull of Joseph Haydn by "R." (anonymous author) (1932) The Musical Times Vol. 73, No. 1076. (Oct. 1), pp. 942–943.
- Philosopher of mind and cognitive scientist Jerry Fodor drew some inspiration for his modularity thesis from Franz Joseph Gall, the first phrenologist. See Fodor (1983). The Modularity of Mind: An Essay on Faculty Psychology.
- Bugs Bowery Bugs (1949) Merrie Melodies (Warner Brothers) (archive.org copy)