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Phrenology

Pseudoscientific study of human skull shape

  • 26 min read
  • 10 chapters

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Phrenology is today recognized as pseudoscientific. The methodological rigor of phrenology was doubtful even for the standards of its time, since many authors already regarded phrenology as pseudoscience in the 19th century. There have been various studies conducted that discredited phrenology, most of which were done with ablation techniques. Marie Jean Pierre Flourens demonstrated through ablation that the cerebrum and cerebellum accomplish different functions. He found that the impacted areas never carried out the functions that were proposed through phrenology. Paul Broca also discredited the idea when he discovered and named the "Broca's area": the patient's ability to produce language was lost while their ability to understand language remained intact, due to a lesion on the left frontal lobe. He concluded that this area of the brain was responsible for language production. Between Flourens and Broca, the claims to support phrenology were dismantled. Phrenological thinking was influential in the psychiatry and psychology of the 19th century. Gall's assumption that character, thoughts, and emotions are located in specific areas of the brain is considered an important historical advance toward neuropsychology. He contributed to the idea that the brain is spatially organized, but not in the way he proposed. There is a clear division of labor in the brain but none of which even remotely correlates to the size of the head or the structure of the skull. It contributed to some advancements in understanding the brain and its functions.

While phrenology itself has long been discredited, the study of the inner surface of the skulls of archaic human species allows modern researchers to obtain information about the development of various areas of the brains of those species, and thereby infer information about their cognitive and communicative abilities, and possibly even about their social lives. Due to its limitations, this technique is sometimes criticized as "paleo-phrenology."

Etymology

The term phrenology, from Ancient Greek φρήν (phrēn) 'mind' and λόγος (logos) 'knowledge', was used in the early 19th century to refer to what would now be considered psychology: a broader study of the mind and human mental faculties. This meaning has been eclipsed by the more specific study of the skull shape to infer psychological traits.

Other terms historically used to discuss this specific relationship between the skull and the mind, and especially Gall's study of them, include craniology, cranioscopy, zoonomy, organology, bumpology and functionalism. Craniology and cranioscopy became detached from the specific sense of phrenology, and were later used to refer merely to the study of the skull, as in anthropology. Many of the other words had or have meanings in other sciences, and their use to refer to the study of phrenology is now archaic.

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