Paul Broca

Paul Broca
Pierre Paul Broca
Born	(1824-06-28)28 June 1824 Sainte-Foy-la-Grande, Gironde, Kingdom of France
Died	9 July 1880(1880-07-09) (aged 56) Paris, France
Nationality	French
Known for	Broca's area Broca's aphasia Diagonal band of Broca
Scientific career
Fields	Anthropology Anatomy Medicine

Pierre Paul Broca (

Broca's work contributed to the development of

Biography

Paul Broca was born on 28 June 1824 in

As a researcher, Broca joined the Society Anatomique de Paris in 1847. During his first six years in the society, Broca was its most productive contributor.[9] Two months after joining, he was on the society's journal editorial committee. He became its secretary and then vice president by 1851.^[10] Soon after its creation in 1848, Broca joined the Société de Biologie.^[11] He also joined and in 1865 became the president of the Societe de Chirurgie (Surgery).^[12][13]

In parallel with his medical career, in 1848 Broca founded a society of free-thinkers, sympathetic to Charles Darwin's theories. He once remarked, "I would rather be a transformed ape than a degenerate son of Adam".^[8][14] This brought him into conflict with the church, which regarded him as a subversive materialist and a corrupter of the youth. The church's animosity toward him continued throughout his lifetime, resulting in numerous confrontations between Broca and the ecclesiastical authorities.^[8]

In 1857, feeling pressured by others, and especially his mother, Broca married Adele Augustine Lugol. She came from a Protestant family and was the daughter of prominent physician Jean Guillaume Auguste Lugol. The Brocas had three children: daughter Jeanne Francoise Pauline (1858–1935), son Benjamin Auguste (1859–1924), and son Élie André (1863–1925). One year later, Broca's mother died and his father, Benjamin, came to Paris to live with the family until his death in 1877.^[15]

In 1858, Paul Broca was elected as member of the German Academy of Sciences Leopoldina.^[16] In 1859, he founded the Society of Anthropology of Paris. In 1872, he founded the journal Revue d'anthropologie, and in 1876, the Institute of Anthropology. The French Church opposed the development of anthropology, and in 1876 organized a campaign to stop the teaching of the subject in the Anthropological Institute.^[5][8] In 1872, Broca was elected as a member to the American Philosophical Society.^[17]

Near the end of his life, Paul Broca was elected a

Since the 1600s, the majority of medical advancements emerged through interaction in independent and sometimes secret societies.^[19] The Society Anatomique de Paris met every Friday and was chaired by anatomist Jean Cruveilhier, and interned by "the Father of French neurology" Jean-Martin Charcot; both of whom were instrumental in the later discovery of multiple sclerosis.^[20] At its meetings, members would make presentations regarding their scientific findings, which would then be published in the regular bulletin of the society's activities.^[9]

Like Cruveilhier and Charcot, Broca made regular Society Anatomique presentations on

As a surgeon, Broca wrote a detailed review on recently discovered use of chloroform as anesthesia, as well as on his own experiences of using novel pain managing methods during surgery, such as hypnosis and carbon dioxide as a local anesthetics.^[29] Broca used hypnosis during surgical removal of an abscess and received mixed results, as the patient felt pain at the beginning which then went away, and she could not remember anything afterwards. Because, of inconsistent results reported by other doctors, Broca did not repeat in using hypnosis as an anesthetic.^{[n 3]} Because of his patient's memory loss, he saw the most potential in using it as a psychological tool.^[30][31] In 1856, Broca published On Aneurysms and their Treatment, a detailed, almost a thousand page long review of all accessible records on diagnosis and surgical and non treatment for these weakened blood vessels conditions. This book was one of the first published monograms on a specific subject. Before his later achievements, it was this work, that Broca was known for by other French doctors.^[32][33]

In 1857, Broca contributed to Charles-Édouard Brown-Séquard's work on the nervous system, conducting vivisection experiments, where specific spinal nerves were cut to demonstrate the spinal pathways for sensory and motor systems. As a result of this work. Brown-Séquard became known for demonstrating the principle of decussation, where a vertebrate's neural fibers cross from one lateral side to another, resulting in phenomenon of the right side of that animals brain controlling the left side of the other.^[34]

As a scientist, Broca also developed theories and made hypotheses that would eventually be disproven. Based on reported findings, for example, he published work in support of viewing syphilis as a virus.^[34] When western medicine discovered the qualities of the muscle relaxant curare, used by South American Indian hunters as poison, Broca thought there was strong support for the incorrect idea that, aside from being applied topically, curare could also be diluted and ingested to counter tetanus caused muscle spasms.^[35][34]

Broca also spent many of his earlier years researching cancer. His wife had a known family history of carcinoma, and it is possible that this piqued his interest in exploring possible hereditary causes of cancer. In his investigations, he accumulated evidence supporting the hereditary nature of some cancers while also discovering that cancer cells can run through the blood.^[36] Many scientists were skeptical of Broca's hereditary hypothesis, with most believing that it is merely coincidental. He stated two hypotheses for the cause of cancer, diathesis and infection. He believed that the cause may lie somewhere between the two. He then hypothesized that (1) diathesis produces the first cancer (2) cancer produces infection, and (3) infection produces secondary multiple tumors, cachexia, and death."^[37]

Anthropology

Broca spent much time at his Anthropological Institute studying skulls and bones. It has been argued that he was attempting to use the measurements obtained by these studies as his main criteria for ranking racial groups in order of superiority. In that sense, Broca was a pioneer in the study of physical anthropology a part of which has been called 'scientific racism.' He advanced the science of cranial anthropometry by developing many new types of measuring instruments (

Broca first became acquainted with anthropology through the works of

In 1857, Broca was presented with a hybrid leporid, a result of a cross species reproduction between a rabbit and hare. The crossbreeding was done for commercial rather than scientific reasons, as the resulting hybrids became very popular pets. Specific circumstances had to be set up in order for differently behaving species to reproduce and for their hybrid descendants to be able to reproduce between themselves. To Broca, the fact that different animals are able to intermix and create fertile offspring did not prove that they were of the same species.^[40]

In 1858, Broca presented these findings on leporids to the Société de Biologie. He believed that the key element of his work was its implication that physical differences between human races could be explained by them being different species with different origins rather than the single moment of creation. While Charles Darwin's On the Origin of Species did not come out until the following year, the topic of human origin was already widely discussed in science, but still capable of producing a negative response from the government. Because of that worry, Pierre Rayer the president of the Société, along with other members with which Broca was on good relations, asked Broca to stop further discussion of the topic. Broca agreed, but was adamant for the discussion to continue, so in 1859 he formed the Société d'Anthropologie.^[41]

Racial groups and human species

As a proponent of

Looking at historical population figures, Broca concluded that the population of France was an example of a eugenesic mixed race, resulting from intermixing of Cimbri, Celtic, Germanic and Northern races within the Caucasian group.^[50] On the other hand, the thought that observations and population data from different regions of Africa, Southeast Asia, and North and South America, showed a significant decrease in physical and intellectual abilities of mixed groups when compared to the different races that they originated from. Concluding that intermixed descendants of different racial groups could only be Paragenesic.

I am far from advancing these suppositions as demonstrated truths. I have studied and analysed all documents within my reach; but I cannot be responsible for facts not ascertained by myself, and which are too much in opposition to generally received opinions to be admitted without strict investigation... Until we obtain further particulars we can only reason upon the known facts; but these, it must be admitted, are so numerous and so authentic as to constitute if not a rigorous definitive demonstration, at least a strong presumption of the doctrines of polygenists.^[51]

On the Phenomenon of Hybridity was published the same year as Darwin's presentation of the theory of evolution in the On the Origin of Species. At that time, Broca thought of each racial group was independently created by nature. He was against slavery and disturbed by extinction of native populations caused by colonization.^[52] Broca thought that monogenism was often used to justify such actions, when it was argued that, if all races were of a single origin then "the lower status of non-Caucasians" was caused by how their race acted following creation. He wrote:

The difference of origin by no means implicates the subordination of races. It, on the contrary, implicates the idea that each race of men has originated in a determined region, as it were, as the crown of the fauna of that region; and if it were permitted to guess at the intention of nature, we might be led to suppose that she has assigned a distinct inheritance to each race, because, despite of all that has been said of the cosmopolitism of man, the inviolability of the domain of certain races is determined by their climate.^[53]

Craniometry

Broca is known for making contributions towards anthropometry—the scientific approach to measurements of human physical features. He developed numerous instruments and data points that were the basis of current methods of medical and archeological craniometry. Specifically, cranial points like glabella and inion and instruments like craniograph and stereograph.^[54] Unlike Morton, who believed that a subject's brain size was the main indicator of intelligence, Broca thought that there were other factors that were more important. These included prognathic facial angles, with closer to right angles indicating higher intelligence, and the cephalic index relationship between the brain's length and width, that was directly proportional with intelligence, with the most intelligent European group being 'long headed', while the least intelligent Negro group being 'short headed'.^[55] He thought that the most important aspect, was the relative size between the frontal and rear areas of the brain, with Caucasians having a larger frontal area than Negroes.^[55] Broca eventually came to the conclusion that larger skulls were not associated with higher intelligence, but still believed brain size was important in some aspects such as social progress, material security, and education.^{[56][n 6]} He compared cranial capacity of different types of Parisian skulls. In doing so he found that the average oldest Parisian skull was smaller than a modern, wealthier Parisian skull and that both were bigger than the average skull from a poor Parisian's grave.^{[n 7]} Aside from his approaches to craniometry, Broca made other contributions to anthropometry, such as developing field work scales and measuring techniques for classifying eye, skin, and hair color, designed to resist water and sunlight damage.^[60]

Evolution

In 1861 Broca published On the Phenomenon of Hybridity two years after Darwin's On the Origin of Species was published. Broca accepted evolution as one of the main elements of a broader explanation for diversification of species: "I am one of those who do not think that Charles Darwin has discovered the true agents of organic evolution; on the other hand I am not one of those who fail to recognize the greatness of his work ... Vital competition ... is a law; the resultant selection is a fact; individual variation, another fact."^[61]

He came to reject polygenism as applied to humans, conceding that all races were of single origin. In 1866, after the discovery of a chinless and protruded Neanderthal jaw, he wrote: "I have already had occasion to state that I am not a Darwinist ... Yet I do not hesitate ... to call this the first link in the chain which, according to the Darwinists, extends from man to ape..."^[62] He saw some differences between groups of animals as too distinct to be explained through evolution from a single source:

There is no reason for limiting to a single spot and single moment the spontaneous evolution of matter ... To me it seems most likely that centers of organization appeared in very different places and at very different periods ... This polygenic transformism is what I would be inclined to accept ... My objection against Darwinism would be invalid if it conceded that organized beings have an undetermined but considerable number of distinct origins and if structural analogies were no longer considered sufficient proof for common parentage.^[63]

Even on a narrower level Broca saw evolution as insufficient explanation for the presence of some traits:

Apply Darwin's thinking to the genus Orang (Satyrus) ... He alone, of all the primates, has no nail on his big toe. Why? ... The Darwinists will answer that one day a certain Pithecus was born without a big toe nail, and his descendants have perpetuated this variety ... Let us call this ape ... Prosatyrus I, as it behooves the founder of a dynasty ... While, according to the law of immediate heredity, some of his offspring were like their other ancestors in having a nail on every toe, one or more were deprived of the first nail like their father ... Thanks to natural selection, this character finally became constant ... But I do not see ... how this negative characteristic ... might give him advantage in the struggle for existence.^[64]

Ultimately, Broca believed that there had to be a process that ran parallel to evolution, to fully explain the origins of, and divergences, between different species.^[65]

Language

Broca's area

Broca is celebrated for his theory that the speech production center of the brain is located on the left side of the brain and for pinpointing the location to the ventroposterior region of the frontal lobes (now known as Broca's area). He arrived at this discovery by studying the brains of aphasic patients (persons with speech and language disorders resulting from brain injuries).^[66]

This area of study began for Broca with the dispute between the proponents of cerebral localization – whose views derived from the

Broca's Society of Anthropology of Paris was where language was regularly discussed in the context of race and nationality, it also became a platform for addressing its physiological aspects. The localization of function controversy became a topic of regular debate when several experts of head and brain anatomy, including Aubertin, joined the society. Most of these experts still supported Flourens argument, but Aubertin was persistent in presenting new patients to counter their views. However, it was Broca, not Aubertin, who finally put the localization issue to rest.

In 1861, Broca visited a patient in the Bicêtre Hospital named Louis Victor Leborgne, who had a 21-year progressive loss of speech and paralysis but not a loss of comprehension nor mental function. He was nicknamed "Tan" due to his inability to clearly speak any words other than "tan" (pronounced \tɑ̃\, as in the French word temps, "time").^{[68][69][66][70]} Leborgne died several days later due to an uncontrolled infection and resultant gangrene, Broca performed an autopsy, hoping to find a physical explanation for Leborgne's disability.^[71] He determined that, as predicted, Leborgne did in fact have a lesion in the frontal lobe in one of the cerebral hemispheres, which in this case turned out to be the left. From a comparative progression of Leborgne's loss of speech and motor movement, the area of the brain important for speech production was determined to lie within the third convolution of the left frontal lobe, next to the lateral sulcus.^[72][73] One day after Tan's death Broca presented his findings to the anthropological society.^[74]

A second case after Leborgne is what solidified Broca's beliefs that human speech function was localized. Lazare Lelong was an 84-year-old grounds worker who was being treated at Bicêtre for dementia. He had also lost the ability to speak other than five simple, meaningful words – these included his own name, "yes", "no", "always" as well as the number "three".^[75] After his death his brain was also autopsied. Broca found a lesion that encompassed much the same area as had been affected in Leborgne's brain. This finding concluded that a specific area controlled one's ability to produce meaningful sounds, and when it is affected, one can lose their capability to communicate.^[69] For the next two years, Broca went on to find autopsy evidence from twelve more cases in support of the localization of articulated language.^[66][70]

Broca published his findings from the autopsies of the twelve patients in his paper "Localization of Speech in the Third Left Frontal Cultivation" in 1865. His work inspired others to perform careful autopsies with the aim of linking more brain regions to sensory and motor functions. Although history credits this discovery to Broca, another French neurologist, Marc Dax, had made similar observations a generation earlier. Based on his work with approximately forty patients and subjects from other papers, Dax presented his findings at an 1836 conference of southern France physicians in Montpellier.^{[76][n 8]} Dax died soon after this presentation and it was not reported or published until after Broca made his initial findings.^[77] Accordingly, Dax's and Broca's conclusions that the left frontal lobe is essential for producing language are considered to be independent.^[78][77]

However, the brains of Leborgne and Lelong had been preserved whole; Broca had never sliced them to reveal the other damaged structures beneath. Over 100 years later Nina Dronkers, an American cognitive neuroscientist, obtained permission to re-examine these brains using modern MRI technology. This imaging resulted in virtual slices of the historic brains and revealed that these patients had sustained much more damage to the brain than Broca could have known from just studying the outer surface. Their lesions extended to deeper layers beyond the left frontal lobe, including portions of insular cortex and critical white matter pathways below the cortex. This work was published in a peer-reviewed article, and has been cited.^[79]

The brains of many of Broca's aphasic patients are still preserved and available for viewing on a limited basis in the special collections of the Pierre-and-Marie-Curie University (UPMC) in Paris. The collection was formerly displayed in the Musée Dupuytren. His collection of casts is in the Musée d'Anatomie Delmas-Orfila-Rouvière. Broca presented his study on Leborgne in 1861 in the Bulletin of the Société Anatomique.^[66][70]

Patients with damage to Broca's area or to neighboring regions of the left

The discovery of Broca's area revolutionized the understanding of language processing, speech production, and comprehension, as well as what effects damage to this area may cause. Broca played a major role in the localization of function debate, by resolving the issue scientifically with Leborgne and his 12 cases thereafter. His research led others to discover the location of a wide variety of other functions, specifically Wernicke's area.^{[citation needed]}

New research has found that dysfunction in the area may lead to other speech disorders such as

He also invented more than 20 measuring instruments for the use in craniology, and helped standardize measuring procedures.[8]

His name is one of the 72 names inscribed on the Eiffel Tower.

Selected publications

• 1849. De la propagation de l'inflammation – Quelques propositions sur les tumeurs dites cancéreuses. Doctoral dissertation.
• 1856. Des anévrysmes et de leur traitement. Paris: Labé & Asselin
• 1861. "Sur le principe des localisations cérébrales". Bulletin de la Société d'Anthropologie 2: 190–204.
• 1861. "Perte de la parole, ramollissement chronique et destruction partielle du lobe antérieur gauche." Bulletin de la Société d'Anthropologie 2: 235–38.
• 1861. "Remarques sur le siège de la faculté du langage articulé, suivies d'une observation d'aphémie (perte de la parole)." Bulletin de la Société Anatomique de Paris 6: 330–357
• 1861. "Nouvelle observation d'aphémie produite par une lésion de la moitié postérieure des deuxième et troisième circonvolution frontales." Bulletin de la Société Anatomique 36: 398–407.
• 1863. "Localisations des fonctions cérébrales. Siège de la faculté du langage articulé." Bulletin de la Société d'Anthropologie 4: 200–208.
• 1864. On the phenomena of hybridity in the genus Homo. London: Pub. for the Anthropological society, by Longman, Green, Longman, & Roberts
• 1865. "Sur le siège de la faculté du langage articulé." Bulletin de la Société d'Anthropologie 6: 377–393
• 1866. "Sur la faculté générale du langage, dans ses rapports avec la faculté du langage articulé." Bulletin de la Société d'Anthropologie deuxième série 1: 377–82
• 1871–1878. Mémoires d'anthropologie, 3 vols. Paris: C. Reinwald (vol. 1 | vol. 2 | vol. 3)
• 1879. "Instructions relatives à l'étude anthropologique du système dentaire." In: Bulletins de la Société d'anthropologie de Paris, III° Série. Tome 2, 1879. pp. 128–163.

Notes

References

Literature

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External links

Wikisource has the text of the 1911 Encyclopædia Britannica article "Broca, Paul".

Wikisource has original text related to this article:

Author:Paul Broca

• Works by Paul Broca at Project Gutenberg
• Works by or about Paul Broca at Internet Archive
• "Paul Broca's discovery of the area of the brain governing articulated language", analysis of Broca's 1861 article, on BibNum [click 'à télécharger' for English version].