Paul Broca
French surgeon and anatomist who linked speech production to the left frontal lobe
French surgeon and anatomist whose 1861 study of a patient who could say only "tan" linked speech production to the left frontal lobe. He also founded an anthropological society and used skull measurement to rank races, a practice now rejected.
Why this person matters
Broca's examination of Louis Victor Leborgne is the standard example of language localisation in the brain. Bouillaud, Bright and Marc Dax had earlier linked speech loss to the frontal lobe, but Broca's cases drew the attention. His anthropology shows how skull measurement was used to support racial hierarchy.
Main contributions
Leborgne and speech production
In April 1861 he examined Louis Victor Leborgne, called Tan, who had lost meaningful speech but could still understand. The autopsy showed softening in the left frontal lobe. A second patient, Lazare Lelong, had a lesion in the same area, and by 1865 Broca had studied 25 more patients.
Founding the Société d'Anthropologie de Paris
In 1859 he founded the society after colleagues asked him to stop discussing human origins at the Société de Biologie. He defined anthropology as the study of the human group considered as a whole.
Craniometry
He invented more than 20 measuring instruments for craniology. Critics argue that he used cranial measurements as his main criteria for ranking racial groups.
Context and limits
Broca supported polygenism, the view that human races had separate origins, and placed racial groups on a scale from barbarism to civilisation. He proposed that Black people were an intermediate form between apes and Europeans. Stephen Jay Gould judged his data careful but argued that prior beliefs shaped how they were selected and read. MRI work by Nina Dronkers on the preserved brains of Leborgne and Lelong found damage reaching beyond the area Broca described.
In your introductory course
Biological bases of behaviour.Appears in biological chapters as Broca's area and the case of Tan. The racial ranking in his anthropology is a standard example of biased measurement.
Related course reading: Psychology 2e, section 3.4. This is course context rather than a biographical source.
Years of active work
- 1859
He founded the Société d'Anthropologie de Paris.
- 1861
He presented Leborgne's case at the society on 18 April, and Lelong's in November.
- 1865
By this year he had studied 25 more patients and concluded that speech articulation depends on the left frontal lobe.
Sources
- Hektoen International, article on Broca and LeborgnePublisher. Text passages inspected.
- Scientific American, The man who couldn't speak and how he revolutionized psychologyPublisher. Text passages inspected.
- Theories of Race, Paul BrocaReference work. Reference article inspected.
- Wikipedia, Paul BrocaReference work. Reference article inspected.