Pierre Paul Broca (// or //; 28 June 1824 – 9 July 1880) was a French physician, anatomist and anthropologist. He was born in Sainte-Foy-la-Grande, Gironde. He is best known for his research on Broca's area, a region of the frontal lobe that has been named after him. Broca's area is involved with language. His work revealed that the brains of patients suffering from aphasia contained lesions in a particular part of the cortex, in the left frontal region. This was the first anatomical proof of localization of brain function. Broca's work also contributed to the development of physical anthropology, advancing the science of anthropometry.
|Pierre Paul Broca|
Pierre Paul Broca
28 June 1824|
|Died||9 July 1880
|Fields||Anthropology, anatomy, medicine|
Paul Broca was born on 28 June 1824 in Sainte-Foy-la-Grande, Bordeaux, France, the son of Jean Pierre "Benjamin" Broca, a medical practitioner and former surgeon in Napoleon's service. Broca's mother, Annette Thomas, was a well-educated daughter of a Calvinist, Reformed Protestant, preacher. Huguenot Broca received basic education in the school in his hometown, earning a bachelor's degree at the age of 16. He entered medical school in Paris when he was 17, and graduated at 20, when most of his contemporaries were just beginning as medical students.
After graduating, Broca undertook an extensive internship, first with the urologist and dermatologist Philippe Ricord (1800–1889) at the Hôpital du Midi, then in 1844 with the psychiatrist François Leuret (1797–1851) at the Bicêtre. In 1845, he became an intern with Pierre Nicolas Gerdy (1797–1856), a great anatomist and surgeon. After two years with Gerdy, Broca became his assistant. In 1848, Broca became the Prosector, performing dissections for lectures of anatomy, at the University of Paris Medical School. In 1849, he was awarded a medical doctorate. In 1853, Broca became professor agrégé, and was appointed surgeon of the hospital. He was elected to the chair of external pathology at the Faculty of Medicine in 1867, and one year later professor of clinical surgery. In 1868, he was elected a member of the Académie de medicine, and appointed the Chair of clinical surgery. He served in this capacity until his death. He also worked for the Hôpital St. Antoine, the Pitié, the Hôtel des Clinques, and the Hôpital Necker.
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. Two months after joining, he was on the society's journal editorial committee. He became its secretary and then vice president by 1851. Soon after its creation in 1948, Broca joined the Société de Biologie. He also joined joined and in 1865 became the president of the Societe de Chirurgie (Surgery).
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". 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.
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 a prominent physician Jean Guillaume Auguste Lugol. The Brocas had three children, daughter Pauline who was born in 1858, son Benjamin Auguste in 1859, and son Andre in 1863. One year later, Broca's mother passed away and his father, Benjamin, came to Paris to live with the family until his death in 1877.
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.
Near the end of his life, Paul Broca was elected a Senator for life, a permanent position in the french senate. He was also a member of the Académie française and held honorary degrees from many learned institutions, both in France and abroad. He died of a brain hemorrhage on 9 July 1880, at the age of 56. During his life he was an atheist and identified as a Liberal. His wife died in 1914 when she was 79. Like their father, Auguste and Andre went on to study medicine. Auguste Broca became a professor of pediatric surgery, now known for his contribution to the Broca-Perthes-Blankart operation, while André became a professor of medical optics and is known for developing the Pellin-Broca prism.
Since the 1600s, the majority of medical advancements emerged through interaction in independent and sometimes secret societies. 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. 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.
Like Cruveilhier and Charcot, Broca made regular Society Anatomique presentations on musculoskeletal disorders. He illustrated that Rickets, a disorder that results in weak or soft bones in children, was caused by an interference with ossification due to disruption of nutrition. In their work on osteoarthritis, a form of arthritis, Broca and Amédée Deville, Broca and showed that, like nails and teeth, cartilage is a tissue that requires absorption of nutrients from nearby blood vessels, and described in detail, the process that lead to degeneration of cartilage in joints.[n 1] Broca also made regular presentations on the clubfoot disorder, a birth defect where infants feet where rotated inwards at birth. At the time Broca saw degeneration of muscle tissue as an explanation for this condition, and while the root cause of it is still undetermined, Broca's theory of the muscle degeneration would lead to understanding the pathology of muscular dystrophy. As an anatomist, Broca can be considered as making 250 separate contributions to medical science.[n 2]
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. Broca used hypnosis during surgical removal of an abcess 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. 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.
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.
As a scientist, Broca also developed theories and made hypotheses that would eventually be disproven. Based on reported findings, he published work in support of viewing syphilis as a virus. 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.
Broca spent much time at his Anthropological Institute, studying skulls and bones, and vigorously, 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 and what has been called 'scientific racism.' He advanced the science of cranial anthropometry by developing many new types of measuring instruments (craniometers) and numerical indices. He published around 223 papers on general anthropology, physical anthropology, ethnology, and other branches of this field. He founded the Société d'Anthropologie de Paris in 1859, the Revue d'Anthropologie in 1872, and the School of Anthropology in Paris in 1876.
Broca first became acquainted with anthropology through the works of Isidore Geoffroy Saint-Hilaire, Antoine Étienne Reynaud Augustin Serres and Jean Louis Armand de Quatrefages de Bréau, and by the late 1850s it became his lifetime interest. Broca defined Anthropology as "the study of the human group, considered as whole." Like other scientist of his time, he rejected relying on religious texts, and looked for a scientific explanation for human origin.
In 1857, Broca was presented with a leporid (his own term) 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 leporids 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, this demonstrated that different animals being able to intermix and create fertile offspring, did not prove that they were of the same species.
In 1858, Broca's 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 then the single moment of creation. While Charles Darwin's On the Origins 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 society, 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.
Racial groups and human speciesEdit
As a proponent of polygenism Broca rejected the monogenistic approach that all humans had a common ancestor, instead he viewed human racial groups as coming from different origins. Like most of the proponents on either side, he viewed each racial groups as having a place on a ‘barbarism’ to 'civilization' progression. He saw European colonization of other territories as justified by it being an attempt to civilize the barbaric populations.[n 4] In his 1859 work, On the Phenomenon of Hybridity in the Genus Homo, he argued that it was most reasonable to view humanity as composed of independent racial groups - such as Australian, Caucasian, Mongolian, Malayan, Ethiopian, and American, he saw each racial group as its own species, connected to a geographic location. All together these different species were part of the single genus homo. Like the standard of the time, Broca would also refer to the Caucasian racial group as white, and to the Ethiopian racial group as Negro. In his writing Broca would also use otherHis use of the term 'race' was narrower then how it is used today, Broca considered Celts, Gauls, Greeks, Persians and Arabs to be distinct races that were part of the Caucasian racial group.[n 5] Races within each group had specific physical characteristics that distinguished them from other racial groups. Like his work in anatomy, Broca emphasized that his conclusions rested on empirical evidence, rather than a priori reasoning. He thought that the distinct geographic location of each racial group was one of the main problems with the monogenists argument for common ancestry:
There was even, no necessity to insist upon the difficulty, or greater geographical impossibility of the dispersion of so many races proceeding from a common origin, nor to remark that before the remote and the almost recent migrations of Europeans, each natural group of human races occupied upon our planet a region characterized by a special fauna; that no American animal was found either in Australia nor in the ancient continent, and where men of a new type were discovered, there were only found animals belonging to species, then to general, and sometimes to zoological orders, without analogues in other regions of the globe.
Broca also felt that there was not enough evidence for the theory that appearance of different races could be changed by the qualities of the environments that they lived in. Broca saw the physical characteristic of Jews being the same as those portrayed in the Egyptian paintings from the 2,500 b.c., even though, by 1850 a.d. they that population had spread to different locations with vastly different environments. He pointed out that his opponents were unable to provide similar long term comparisons.
Broca, influenced by previous work Samuel George Morton, used the concept of hybridity as his primary argument against monogenis, and that it was flawed to see all of humanity as a single species. Different racial groups' ability reproduce with each was not sufficient to prove that idea. Under the Broca's view on hybridity, the result of a reproduction between two different races could fall into four categories: 1) The resulting offspring are infertile; 2) Where the resulting offspring are infertile when they reproduce between themselves but are sometimes successful when they reproduce with the parent groups; 3) Known as Paragenesic, where the offspring's descendants are able reproduce within themselves and with parents, but the success of the reproduction lowers with every generation until it ends; and 4) Known as Eugenesic, where a successful reproduction can continue indefinitely, between the intermix descendants and with the parent group.
Looking at historical population figures, Broca concluded that the population of France was an example of a Eugenesic mixed race, resulting from intermixing of Cimri, Celtic, Germanic and Northern races within the Caucasian group. 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 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.
On the Phenomenon of Hybridity was published the same year as Darwin's presentation of the theory of evolution in the Origin of the Species. At that time Broca thought of each racial group as independently created by nature. He was against slavery and disturbed by extinction of native populations caused by colonization. Broca thought that monogenism was often used to justify such actions, when it was argued that, if all races where of a single origin then the lower status of non-Caucasians was caused by how their race acted following creation. Instead:
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.
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. 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'. 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. While disagreeing on its importance, Broca did believe that brain size was also important.[n 6] He compared cranial capacity of historical Parisian skulls, to modern skulls taken from private graves, and skulls from graves of poor Parisians, 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] Considering this with skull data from other regions, Broca found that brain size, aside from normal capacity for each race group, also depended on factors such as social progress, material security and education.
Broca was one of the first anthropologists engaged in comparative anatomy of primates and humans. Comparing then dominant Craniometry based measures of intelligence as well as other factors such as relative forearm-to-arm length, he proposed that Negroes were an intermediate form between apes and Europeans. The renowned evolutionary biologist Stephen Jay Gould criticized Broca and his contemporaries of being engaged "scientific racism" when conducting their research. Basing their work on biological determinism, and "a priori expectations" that "social and economic differences between human groups—primarily races, classes, and sexes—arise from inherited, inborn distinctions and that society, in this sense, is an accurate reflection of biology."
Broca is celebrated for his discovery of the speech production center of the brain located in 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).
This area of study began for Broca with the dispute between the proponents of cerebral localization – whose views derived from the phrenology of Franz Joseph Gall (1758–1828) – and their opponents led by Pierre Flourens (1794–1867). Phrenologists believed that the human mind has a set of various mental faculties, each one represented in a different area of the brain. With specific areas representing personality characteristics like one's aggressiveness or spirituality, but also memory and linguistic abilities. Their opponents claimed that, by careful ablation (specific way of removing material) of various brain regions, Flourens had disproved Gall's hypotheses. However, Gall's former student, Jean-Baptiste Bouillaud (1796–1881), kept the localization of function hypothesis alive (especially with regards to a "language center"), although he rejected much of the rest of phrenological thinking. Bouillaud challenged professionals of the time to disprove him by finding a case of frontal lobe damage unaccompanied by a disorder of speech. His son-in-law, Ernest Aubertin (1825–1893), began seeking out cases to either support or disprove the theory, and he found several in support of it.
Broca's Society of Anthropology of Paris became the new platform for the localization of function controversy when several experts of head and brain anatomy joined, including Aubertin. 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 of function existence issue to rest.
In 1861, Broca heard of a patient, named Louis Victor Leborgne, in the Bicêtre Hospital 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".
When Leborgne died just a few days later, Broca performed an autopsy. He determined that, as predicted, Leborgne did in fact have a lesion in the frontal lobe of the left cerebral hemisphere. 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. For the next two years, Broca went on to find autopsy evidence from 12 more cases in support of the localization of articulated language.
Although history credits this discovery to Broca, another French neurologist, Marc Dax, made similar observations a generation earlier, but he died shortly after with no chance to further his evidence. Today the brains of many of Broca's aphasic patients are still preserved in the Musée Dupuytren, and his collection of casts in the Musée d'Anatomie Delmas-Orfila-Rouvière. Broca presented his study on Leborgne in 1861 in the Bulletin of the Société Anatomique.
Patients with damage to Broca's area and/or to neighboring regions of the left inferior frontal lobe are often categorized clinically as having Expressive aphasia (also known as Broca's aphasia). This type of aphasia, which often involves impairments in speech output, can be contrasted with Receptive aphasia, (also known as Wernicke's aphasia), named for Karl Wernicke, which is characterized by damage to more posterior regions of the left temporal lobe, and is often characterized by impairments in language comprehension.
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.
New research has found that dysfunction in the area may lead to other speech disorders such as stuttering and apraxia of speech. Recent anatomical neuroimaging studies have shown that the pars opercularis of Broca's area is anatomically smaller in individuals who stutter whereas the pars triangularis appears to be normal.
He also invented more than 20 measuring instruments for the use in craniology, and helped standardize measuring procedures.
His name is one of the 72 names inscribed on the Eiffel Tower.
- 1849. De la propagation de l'inflammation – Quelques propositions sur les tumeurs dites cancéreuses. Doctoral dissertation.
- 1856. Traité des anévrismes et 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. Nouvelle observation d'aphémie produite par une lésion de la moitié postérieure des deuxième et troisième circonvolution frontales gauches. 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
- 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
- 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.
- Broca's finding that cartilage was a living tissue requiring nutrition, was also independently made by Peter Redfern at University and King's College, Aberdeen. Redfern, Peter (1850). Normal Nutrition in Human Articular Cartilages, with Experimental Researches on the Lower Animals. Sutherland and Knox.
- His contributions and discoveries included: "a third pair of suspensory at the back of the tongue, ... that the splenic pulp ... is composed of ... nucleated cells ... some new and correct opinions on the structure of the liver, the arcades of arteries supplying the gums." Schiller, 1979, p. 97
- Broca's studies on hypnotism were performed in association with other physicians that were studying it: Étienne Eugène Azam, Charles-Pierre Denonvilliers, François Anthime Eugène Follin, and Alfred-Armand-Louis-Marie Velpeau, Broca performed the first experiments in Europe using hypnotism as surgical anesthesia.
- Broca took into consideration works by multiple authors such as Arthur de Gobineau, Robert Knox, Georges Pouchet, Samuel George Morton and Herbert Spencer. Broca, 1964.
- Broca justified using geographic locations rather than skin color when classifying racial groups: "It has been shown that the American type alone includes red, brown, black, white and yellow races. There are brown races in the American, and even in the Caucasian type. All the black races do not belong to the Ethiopian type; and finally, the Malayo-Polynesian type comprises races of colours as various as those belonging to the American type. A classification founded on differences of colour would lead to numerous and serious errors." Broca, 1864, p. 9
- As of 2016, several meta-studies have shown, that in humans, there is a weak correlation between brain size and general intelligence, with results ranging from 9 to 15 percent. 
- In that study, Broca's primary purpose was to compare brain sizes and shapes of Basque and French populations, and participated in digging up 60 skulls from Basque graves while vacationing in Pyrenees.
- "Dr. Paul Broca". Science. 1 (8): 93. 21 August 1880. doi:10.1126/science.os-1.9.93. JSTOR 2900242.
- Schiller, 1979, p. 12
- "Memoir of Paul Broca". The Journal of the Anthropological Institute of Great Britain and Ireland. 10: 242–261. 1881. JSTOR 2841526.
- Schiller, 1979, pp. 91, 93.
- Schiller, 1979, p. 91, 93
- Schiller, 1979, p. 112.
- Ashok, Samantha S., "The History of Race in Anthropology: Paul Broca and the Question of Human Hybridity" (2017). Anthropology Senior Theses. Paper 181.
- Schiller, 1979, pp. 216, 219
- Sagan, Carl. 1979. Broca's Brain. Random House: New York ISBN 1439505241.
- Schiller, 1979, pp. 125-127.
- "Paul Broca (1824-80)". sciencemuseum.org.uk. Retrieved 12 April 2012.
He was a left-wing atheist who argued against African enslavement.
- Schiller, 1979, p. 90
- Compston A (October 1988). "The 150th anniversary of the first depiction of the lesions of multiple sclerosis". J. Neurol. Neurosurg. Psychiatry. 51 (10): 1249–52. doi:10.1136/jnnp.51.10.1249. PMC . PMID 3066846.
- Schiller, 1979, p. 93.
- Broca, Paul (1852). "Memoire sur l'anatomie pathologique du rachitisme". Bull. Soc. anatom.: 141 et 542.
- "Obituary. Dr. Amédée Deville". Lancet. 117: 710. November 8, 1879.
- Schiller, 1979, p. 92
- Recherches sur l'arthrite seche et les corps étrangers. (Bull. Soc. anatom., 1847, p. 271; 1848, p. 141; 1850, p. 69, 91, 197, 239-243; 1852, p. 49-124. Description didactique de l'arthrite sèche, 1850, p. 435-455.)
- Broca, Paul (1850). "Recherches sur l'anatomie pathologique des pieds-bots.". Bull. Soc. anatom.: p. 40, et 1851 p. 50-64.
- Schiller, 1979, p. 94
- Schiller, 1979, p. 97
- Shiller, 1979, pp. 98, 99, 102, 103, 104-106.
- Shiller, 1979, pp. 104-106.
- Broca, P. Sur l'anesthésie chirurgicale hypnotique. Bull. de cette Société, 7 décembre 1859, t. X, p. 247-270.
- P. Broca Des anévrysmes ed de leur traitement. (Paris, 1856, 1 vol. de 930 pages. Labé et Asselin, éditeurs.)
- Schiller, 1979, p. 106.
- Schiller, 1979, pp. 102-103
- McIntyre, A.R. (1947). Curare, Its History, Nature, and Clinical Use. University of Chicago Press.
- "Memoir of Paul Broca". The Journal of the Anthropological Institute of Great Britain and Ireland. 10: 242–261. 1881. JSTOR 2841526.
- Schiller, 1979, p. 136
- Shiller, 1979, p. 129-131
- Shiller, 1979, pp. 130-135
- Broca, 1864, p. 9
- Broca, 1864, pp. 16-17.
- Schiller, 1979, p. 129-130
- Broca, 1864 p. 63-64
- Broca, Paul (1964). "On the Phenomenon of Hybridity in the Genus Homo reprint of Mémoire sur les phénomènes d'hybridité dans le genre human". Anthropological Society: 61–63.
- Ashok, 2017, pp. 13-14
- Broca, 1864, p. 64
- Broca, 1964, Glossorial Note
- Broca, 1964, Section II
- Broca, 1964, pp. 59-60
- Broca, 1864, p. 70
- Broca, 1964, pp. 70-71.
- Spencer, Frank (1997). History of Physical Anthropology, an Encyclopedia Volume 1. Taylor and Francis. p. 87.
- Ashok, 2017, pp. 31-32
- Koch, Christof. "Does Brain Size Matter?". Scientific American Mind. 27 (1): 22–25. doi:10.1038/scientificamericanmind0116-22.
- "Brain volume and intelligence: The moderating role of intelligence measurement quality". Intelligence. 64: 18–29. 2017-09-01. doi:10.1016/j.intell.2017.06.004. ISSN 0160-2896.
- Schiller, 1979, pp. 149-50
- Histoire des travaux de la Société d'anthropologie de 1859 à 1863, lue dans la seance solennelle du 4 juin 1863. (Mémoire d'anthologie, 1865, t II, VII-LI.)
- Schiller, 1979, pp. 150-51
- Gould S. J (1978) Morton's ranking of races by cranial capacity: unconscious manipulation of data may be a scientific norm. Science 200: 503–509.
- Gould, Steven Jay (1981). The Mismeasure of Man (1st ed.). New York: Norton. pp. 20, 83–84. ISBN 0-393-01489-4.
- Schiller, 1979, pp. 149-50
- Fancher, Raymond E. Pioneers of Psychology, 2nd ed. (New York: W.W. Norton & Co., 1990 (1979), pp. 72–93.
- "Identity of Famous 19th-Century Brain Discovered". Live Science. Archived from the original on 2016-06-14. Retrieved 2017-01-24.
- Broca, Paul. “Remarks on the Seat of the Faculty of Articulated Language, Following an Observation of Aphemia (Loss of Speech)” Archived 17 January 2001 at the Wayback Machine.. Bulletin de la Société Anatomique, Vol. 6, (1861), 330–357.
- Beal, Deryk S.; Lerch, Jason P.; Cameron, Brodie; Henderson, Rhaeling; Gracco, Vincent L.; De Nil, Luc F. (3 March 2015). "The trajectory of gray matter development in Broca's area is abnormal in people who stutter". Frontiers in Human Neuroscience. 9. doi:10.3389/fnhum.2015.00089. ISSN 1662-5161.
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- Alajouanine T, Signoret JL (1980). "Paul Broca and aphasia" [Paul Broca and aphasia]. Bulletin de l'Académie Nationale de Médecine (in French). 164 (6): 545–51. PMID 7008915.
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|Wikisource has the text of the 1911 Encyclopædia Britannica article Broca, Paul.|
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