The study of race and intelligence is a controversial field which seeks to determine whether or not human intellectual abilities vary between races and/or the causes of any differences that appear in the measurements. The term race or racial group usually refers to the concept of categorizing Humans into Populations or groups on the basis of various sets

The modern controversy surrounding intelligence and race focuses primarily on the results of intelligence testing (IQ) studies conducted during the second half of the 20th century in the United States, Western Europe, and other industrialized nations. An Intelligence Quotient or IQ is a score derived from one of several different Standardized tests attempting to measure Intelligence. The United States of America —commonly referred to as the Western Europe at its most general meaning means 'all the countries in the West of Europe ' ^[1] There are also controversies over the nature of race, the meaning and importance of intelligence, and whether the intelligence quotient is a satisfactory measure of intelligence; see the respective articles on those subjects for more information. The term race or racial group usually refers to the concept of categorizing Humans into Populations or groups on the basis of various sets Intelligence (also called intellect) is an Umbrella term used to describe a property of the Mind that encompasses many related abilities such as the capacities An Intelligence Quotient or IQ is a score derived from one of several different Standardized tests attempting to measure Intelligence.

While the existence of average intelligence test score differences (e. g. , a 15 point IQ gap between the average of white Americans and the average of black Americans) has been shown in many large studies and is therefore not much in dispute, there is a great deal of controversy surrounding causal explanations of the disparities. The range of views among contemporary scholars include:

• Arthur Jensen argues that differences in cognitive abilities between races exist and are caused by both social/environmental disparities and also genetic differences between races. Arthur Jensen (born August 24 1923) is a Professor Emeritus of Educational psychology at the University of California Berkeley.
• James Flynn argues that differences in cognitive abilities between races exist and are of social/environmental origin. James Robert Flynn (born 1934 aka Jim Flynn, Emeritus Professor of Political Studies at the University of Otago in Dunedin, New Zealand, researches
• Robert Sternberg argues that the use of differences in test scores to argue for race differences in intelligence is a case of the inappropriate use of tests in different groups. Robert J Sternberg (born December 8, 1949) is an American psychologist and psychometrician and the Dean of Arts and Sciences at Tufts University
• Ashley Montagu and Joseph L. Graves, amongst others, argue that race is not a biological concept, but rather is socially constructed, and hence measurements of IQ differences between races cannot reflect an underlying intrinsic biological cause. Montague Francis Ashley Montagu (born Israel Ehrenberg on June 28 1905, East London England - died November 26 1999, Princeton New Jersey Joseph L Graves, Jr is Dean of University Studies and Professor of Biological Studies at North Carolina Agricultural and Technical State University. The term intrinsic denotes a characteristic or property of some thing or action which is essential and specific to that thing or action and which is wholly independent ^[2][3][4]

Theories that invoke a contribution from genetic factors to explain the black-white gap in IQ scores are highly controversial. The genetic hypothesis was brought to public attention following the publication of an article by Arthur Jensen in 1969, which argued that the high within-group heritability of IQ, when combined with empirical findings about factors that affect IQ, suggested that genetic factors might contribute to the black-white IQ gap. Discussions of the heritability of IQ and its relationship to the cause of between-group differences in IQ are also is controversial. ^{[5][6][7][8][9]} A number of subject matter experts,^[10][11][12] do not accept that research into race and intelligence is measuring anything real (and hence worthy of serious scientific attention).

Theories about a relationship between race and intelligence have been the subject of speculation and debate since the 16th century. Intelligence (also called intellect) is an Umbrella term used to describe a property of the Mind that encompasses many related abilities such as the capacities ^[13][14] The contemporary debate focuses on the nature, causes, and importance, or lack of importance, of ethnic differences in intelligence test scores and other measures of cognitive ability, and whether race is a meaningful biological construct. Cognition is a concept used in different ways by different disciplines but is generally accepted to mean the process of awareness or thought The question of the relative roles of nature and nurture in causing individual and group differences in cognitive ability is seen as fundamental to understanding the debate. The nature versus nurture debates concern the relative importance of an individual's innate qualities ("nature" i ^[15]

History

The opinion that there are differences in the brain structures or sizes of different racial and ethnic groups was widely held and studied during the 19th and early 20th centuries. ^[16] During this time period, research on race and intelligence was often used to claim that one race was superior to another, justifying the poor status and treatment of the "inferior" race. ^[17]

The writings of Sir Francis Galton, a psychometrician and polymath (1822–1911), spurred interest in the study of mental abilities, particularly as they relate to heredity and eugenics. Sir Francis Galton FRS ( 16 February 1822 &ndash 17 January 1911) half-cousin of Charles Darwin, was an Psychometrics is the field of study concerned with the theory and technique of Educational and Psychological Measurement, which includes the measurement A polymath ( Greek polymathēs, πολυμαθής "having learned much" is a person whose knowledge is not restricted to one subject area Eugenics is a social Philosophy which advocates the improvement of Human Hereditary traits through various forms of intervention ^[18] Galton claimed from his field observations in Africa that the African people were significantly below Anglo-Saxons' position in the normal frequency distribution of general mental ability; these claims continue to spark controversy in academia today. ^[19]

The scientific debate on the contribution of nature versus nurture to individual and group differences in intelligence can be traced back to at least the mid-19th century. The nature versus nurture debates concern the relative importance of an individual's innate qualities ("nature" i ^[20] Beginning in the 1930s, race difference research and hereditarianism — the belief that genetics are the primary cause of differences in intelligence among human groups — began to fall out of favor in psychology and anthropology after major internal debates. Hereditarianism is the doctrine or school of thought that Heredity plays a significant role in determining human nature and character traits such as intelligence Genetics (from Ancient Greek grc-Latn genetikos, “genitive” and that from grc-Latn genesis, “origin” a discipline of Biology, is ^[21] By 1961, the mainstream view was that there were no race differences in intelligence, or if there were, they were solely the result of environmental factors. ^[22]

Contemporary issues

Cumulative IQ gaps by race or ethnicity based on 1981 U. S. distributions. According to these findings, WAIS IQs for Whites (mean = 101. Wechsler Adult Intelligence Scale (WAIS is a general test of intelligence ( IQ) published in February 1955 as a revision of the Wechsler - Bellevue test 4, SD = 14. 7) were higher than those for Blacks (mean = 86. 9, SD = 13. 0); distributions for Hispanics (mean = 91), East Asians (mean = 106), and Ashkenazi Jews (mean = 112-115) are less precise because of overlap and small sample size. The modern debate focuses on what causes these disparities in average IQ. Based on Reynolds et al. 1987, p. 330.

The contemporary debate on race and intelligence is about the nature and the causes of racial and ethnic differences in IQ test scores; many hypotheses have been proposed to explain racial-ethnic group differences in IQ. Certain environmental factors, such as nutrition, are thought to modulate IQ in children, and other influences have been hypothesized, including education level, richness of the early home environment, and other social, cultural, or economic factors. Nutrition (also called nourishment or aliment) is the provision to cells and Organisms of the materials necessary (in the form of food to support The most controversial and most publicized part of the debate is whether group IQ differences also reflect a genetic component. Hereditarianism hypothesizes that a genetic contribution to intelligence could include genes linked to neuron structure or function, brain size or metabolism, or other physiological differences which could vary with biogeographic ancestry. Hereditarianism is the doctrine or school of thought that Heredity plays a significant role in determining human nature and character traits such as intelligence Brain size CraniometryWhen comparing different species the ratio of brain weight to body weight does present a correlation with intelligence though the actual brain weight has little This hypothesis is often thought to conflict with fundamental tenets of a number of widely held social philosophies, such as egalitarianism. Egalitarianism (derived from the French word égal, meaning equal) is a political doctrine that holds that all people should be treated as equals and have

The 1970s debates

The modern debate was prompted by psychology professor Arthur Jensen's 1969 publication of the controversial article, "How Much Can We Boost IQ and School Achievement?". Arthur Jensen (born August 24 1923) is a Professor Emeritus of Educational psychology at the University of California Berkeley. ^[23]

All we are left with are various lines of evidence, no one of which is definitive alone, but which, viewed together, make it a not unreasonable hypothesis that genetic factors are strongly implicated in the average negro-white intelligence difference. The preponderance of evidence is, in my opinion, less consistent with a strictly environmental hypothesis than with a genetic hypothesis, which, of course, does not exclude the influence of environment or its interaction with genetic factors. ^[24]

According to Peter Singer, the article was widely reported in the popular press "as an attempt to defend racism on scientific grounds"^[25]. Peter Albert David Singer (born July 6, 1946 in Melbourne, Victoria, Australia) is an Australian philosopher.

Physicist William Shockley, who shared the 1956 Nobel Prize in Physics, spent much of his later life focused on the questions of race, intelligence, and eugenics. William Bradford Shockley ( February 13, 1910 &ndash August 12, 1989) was a British -born American Physicist The Nobel Prize in Physics (Nobelpriset i fysik is awarded once a year by the Royal Swedish Academy of Sciences. Eugenics is a social Philosophy which advocates the improvement of Human Hereditary traits through various forms of intervention He began giving speeches on population problems and published several controversial papers arguing that intelligence is primarily hereditary. ^[26][27] He postulated that the higher reproduction rate of those with lower intelligence was having a dysgenic effect on society and proposed that individuals with IQs below 100 be paid to undergo voluntary sterilization. Dysgenics (and cacogenics) describes a system of breeding wherein artificial Selection is for traits that are deleterious or perceived as ethically An Intelligence Quotient or IQ is a score derived from one of several different Standardized tests attempting to measure Intelligence. Sterilization (also spelled sterilisation) is a surgical technique leaving a male or female unable to reproduce. Biologists and geneticists criticized his theories and pointed out that eugenics was a rationale used by the Nazis. Reductio ad Hitlerum, also argumentum ad Hitlerum, or reductio (or argumentum) ad Nazium Nazism, which was a short name for National Socialism (Nationalsozialismus refers primarily to the Ideology and practices of the National Socialist German He was attacked in the media and in scientific journals. Shockley described his work on the issue as the most important of his career. ^[28]

Population geneticist Luigi Luca Cavalli-Sforza on several occasions publicly debated Arthur Jensen and William Shockley arguing that environmental factors could explain the black-white IQ gap. Luigi Luca Cavalli-Sforza (born January 25, 1922) is an Italian population geneticist born in Genoa, who has been a professor at ^[29] In 1981, Stephen J. Gould published The Mismeasure of Man, which argued against the concept of g, the general factor of cognitive ability. Stephen Jay Gould (September 10 1941 &ndash May 20 2002 was a prominent American paleontologist, evolutionary biologist, and historian of science The Mismeasure of Man is a controversial 1981 book written by the Harvard paleontologist Stephen Jay Gould (1941-2002

The 1990s debates

The question of whether group differences in average IQ are purely social, economic, and cultural in nature or whether genetic factors may also be involved has continued to receive wide media coverage; this prompted a number of academic bodies to make public statements on their views. For example, the American Anthropological Association issued a declaration which dismissed the debate on the grounds that they view 'race' to be a biologically meaningless categorisation of human beings, ^[30], while the American Psychological Association released a statement in which they acknowledged the reality of between-group IQ differences, but said that the current evidence, while scarce, did not support a genetic cause. Founded in 1902 the American Anthropological Association (AAA is the world’s largest professional organization of scholars and practitioners in the field of Anthropology. The American Psychological Association (APA is a professional organization representing psychologists in the U ^[31] The claim that there are genetic causes for differences in averages of IQ scores between races has been forwarded by scholars such as Charles Murray, Michael Levin, and J. Philippe Rushton. This article is about the political scientist For other people with the same name see Charles Murray (disambiguation. Michael Levin (PhD Columbia University) is professor of philosophy at City University of New York, who has published works on Metaphysics, John Philippe Rushton (born December 3, 1943) is a Psychology professor at the University of Western Ontario, Canada, most widely Their research has been criticized by other scholars such as Stephen Jay Gould, Richard Levin, Richard Lewontin and Joseph L. Graves. Stephen Jay Gould (September 10 1941 &ndash May 20 2002 was a prominent American paleontologist, evolutionary biologist, and historian of science Richard Charles Levin (born 1947 is a Professor and American economist, who has served as president of Yale University since 1993 Richard Charles "Dick" Lewontin (born March 29, 1929) is an American Evolutionary biologist Joseph L Graves, Jr is Dean of University Studies and Professor of Biological Studies at North Carolina Agricultural and Technical State University. ^{[32] [33] [34]}

Snyderman and Rothman study

The Snyderman and Rothman study was published in 1988, claiming a "liberal media bias on the reporting of race and intelligence". The Snyderman and Rothman study uncovered supposed liberal bias in reporting on Race and intelligence. The study suggested the media gave a misleading impression of what the mainstream view is in the scientific community regarding the relative importance of genetic and environmental factors in explaining individual and group differences in IQ. It claimed that the media regularly presented the views of those who stress that individual and group differences may be substantially genetic as a minority view, however, their 1987 survey of expert opinion found that the opposite was true.

The methodology and results of this and other similar studies have been criticized by the Columbia Journalism Review^[35] and Fair. org. ^[36]

The Bell Curve

The social consequence of Black-White difference in IQ were discussed in The Bell Curve.

Main article: The Bell Curve

The publication of The Bell Curve in 1994, which included a discussion of racial differences in intelligence, received much attention in the popular press and ignited renewed debate within academia and amongst the general public. See Normal distribution for the "bell curve" in Statistics and see Bell curve grading for the "bell curve" in grading See Normal distribution for the "bell curve" in Statistics and see Bell curve grading for the "bell curve" in grading The Bell Curve is a controversial, best-selling 1994 book by American psychologist Richard Herrnstein and American Enterprise Institute political scientist Charles Murray. This is a list of controversial non-fiction books aimed at the general reader which discuss controversial issues or have been (or were at the time of writing discussed for other reasons The United States of America —commonly referred to as the Richard J Herrnstein ( May 20 1930 – September 13 1994) was a prominent American researcher in animal The American Enterprise Institute for Public Policy Research (AEI is a conservative Think tank, founded in 1943 This article is about the political scientist For other people with the same name see Charles Murray (disambiguation. Its central point is that intelligence is a better predictor of many factors including financial income, job performance, unwed pregnancy, and crime than parents' socioeconomic status or education level. Socioeconomic status (SES is a combined measure of an individual's or family’s economic and social position relative to others based on Income, Education, and Also, the book argued that those with high intelligence (the "cognitive elite") are becoming separated from the general population of those with average and below-average intelligence, and that this was a dangerous social trend. The cognitive elite of a Society, according to some Social science researchers are those having higher intelligence levels and thus better prospects for Much of the controversy concerned Chapters 13 and 14, in which the authors wrote about the enduring racial differences in intelligence and discuss implications of those differences. The authors were reported throughout the popular press as arguing that these IQ differences are genetic, although they state no position on the issue in the book, and write in the introduction to Chapter 13 that "The debate about whether and how much genes and environment have to do with ethnic differences remains unresolved. "

Shortly after publication, many people rallied both in criticism and defense of the book. Some critics denounced the book and its authors as supporting scientific racism. Scientific racism denotes the use of scientific or ostensibly scientific findings and methods to support or validate racist attitudes and worldviews A number of critical texts, including The Bell Curve Debate and The Mismeasure of Man (second edition), were written in response to the book. The Bell Curve Debate is a response to The Bell Curve, by Richard J The Mismeasure of Man is a controversial 1981 book written by the Harvard paleontologist Stephen Jay Gould (1941-2002

American Psychological Association report

Main article: Intelligence: Knowns and Unknowns

In response to the controversy surrounding The Bell Curve, the American Psychological Association's Board of Scientific Affairs in 1995 established a special task force to publish an investigative report on the research presented in the book. Intelligence Knowns and Unknowns is a report of a Task Force established by the Board of Scientific Affairs of the American Psychological Association. The American Psychological Association (APA is a professional organization representing psychologists in the U The report, titled "Intelligence: Knowns and Unknowns"^[37] and published in the February 1996 issue of American Psychologist, agreed with some of the book's statements on intelligence^[38]; however, regarding the book's genetic implications, it states:

It is sometimes suggested that the Black/White differential in psychometric intelligence is partly due to genetic differences (Jensen, 1972). There is not much direct evidence on this point, but what little there is fails to support the genetic hypothesis. ^[39]

The January 1997 issue of American Psychologist published an article with eleven critical responses to the American Psychological Association (APA) report, most of which agreed with the substance of the report, but suggested ways in which the report could have been improved. Only Lynn and Rushton "dispute the task force's conclusion that there is no direct evidence for a genetic interpretation of the Black—White IQ difference. "^[40] The APA report concluded with a call for more reflection in debates on intelligence and for a "shared and sustained effort" in more research to answer the many unanswered questions that remain.

"Mainstream Science on Intelligence" editorial

Main article: Mainstream Science on Intelligence

A collective statement titled "Mainstream Science on Intelligence" was published in the Wall Street Journal on December 13, 1994. "Mainstream Science on Intelligence" was an opinion piece published in the Wall Street Journal on December 13, 1994. Events 1294 - Saint Celestine V abdicates the papacy after only five months Celestine hoped to return to his previous life Year 1994 ( MCMXCIV) was a Common year starting on Saturday (link will display full 1994 Gregorian calendar) ^[41] It was written by psychology professor Linda Gottfredson, and signed by Gottfredson and 51 other professors specializing in intelligence and related fields. Linda Susanne Gottfredson (born 24 June 1947) is a professor of Educational psychology at the University of Delaware and co-director of the Delaware- It listed 25 statements which claimed to uphold findings on the subject of intelligence research discussed in the The Bell Curve. Intelligence (also called intellect) is an Umbrella term used to describe a property of the Mind that encompasses many related abilities such as the capacities See Normal distribution for the "bell curve" in Statistics and see Bell curve grading for the "bell curve" in grading This statement was reprinted in the psychology journal Intelligence in 1997 with additional information and a bibliography. Intelligence is a Psychology journal that addresses Intelligence and Psychometrics. Regarding the cause of racial-ethnic group differences in IQ, the statement says:

There is no definitive answer to why IQ bell curves differ across racial-ethnic groups. The reasons for these IQ differences between groups may be markedly different from the reasons for why individuals differ among themselves within any particular group (whites or blacks or Asians). In fact, it is wrong to assume, as many do, that the reason why some individuals in a population have high IQs but others have low IQs must be the same reason why some populations contain more such high (or low) IQ individuals than others. Most experts believe that environment is important in pushing the bell curves apart, but that genetics could be involved too. ^[42]

American Anthropological Association Statement

In 1994, the American Anthropological Association published a statement, declaring the organization was:

deeply concerned by recent public discussions which imply that intelligence is biologically determined by race. Founded in 1902 the American Anthropological Association (AAA is the world’s largest professional organization of scholars and practitioners in the field of Anthropology. Repeatedly challenged by scientists, nevertheless these ideas continue to be advanced. Such discussions distract public and scholarly attention from and diminish support for the collective challenge to ensure equal opportunities for all people, regardless of ethnicity or phenotypic variation. ^[43]

Policy debates

See also: Intelligence and public policy

Public policy implications of IQ and race research are one of the greatest sources of controversy surrounding this issue. A large body of research indicates that Intelligence measures such as Intelligence Quotient (IQ varies between individuals and between certain groups and that they correlate Regardless of the source of the IQ gap, most educators agree that it must be addressed; they often advocate equitable funding for education. ^[44][45] An achievement gap refers to the observed disparity on a number of educational measures between the performance of groups of students, including groups defined by race or ethnicity. An achievement gap refers to the observed disparity on a number of Educational measures between the performance of groups of students especially groups defined by Gender Education encompasses both the Teaching and Learning of Knowledge, proper conduct, and technical competency

Some proponents of a genetic interpretation of the IQ gap, such as Rushton and Jensen (2005a) and Gottfredson (2005b), have sometimes argued that their interpretation does not in itself demand any particular policy response: while a conservative/libertarian commentator^[46] may feel the results justify, for example, reductions in affirmative action, a liberal commentator may argue from a Rawlsian point of view (that genetic advantages are undeserved and unjust) for substantial affirmative action. Libertarianism is a term used by a broad spectrum of political philosophies which prioritize individual Liberty and seek to minimize or even abolish the Affirmative action in the United States|Employment equity (Canada|Reservation in India|Numerus clausus The term affirmative action describes many policies aimed at a historically Liberalism is a broad array of related ideas and theories of Government that consider individual Liberty to be the most important political goal John Rawls ( February 21, 1921  &ndash November 24, 2002) was an American Philosopher, a Professor of ^[47] Since all races have representatives at all levels of the IQ curve, this means any policy based on low IQ affects members of all races.

In the book Practical Ethics, philosopher Peter Singer wrote that:

Let us suppose that the genetic hypothesis turns out to be correct. Practical Ethics is an introduction to applied ethics by modern bioethical Philosopher Peter Singer. Peter Albert David Singer (born July 6, 1946 in Melbourne, Victoria, Australia) is an Australian philosopher. . . I believe that the implications of this supposition are less drastic than they are often supposed to be. . . First, the genetic hypothesis does not imply that we should reduce our efforts to overcome other causes of inequality between people. . . Perhaps we should put special efforts into helping those who start from a position of disadvantage, so that we end with a more egalitarian result. Second, the fact that the average IQ of one racial group is a few points higher than that of another does not allow anyone to say that all members of the higher IQ group have higher IQs. . . The point is that these figures are averages and say nothing about individuals. . . The third reason. . . is simply that, as we saw earlier, the principle of equality is not based on any actual equality that all people share. I have argued that the only defensible basis for the principle of equality is equal consideration of interests. . . Equal status does not depend on intelligence. Racists who maintain the contrary are in peril of being forced to kneel before the next genius they encounter.

While not specifically race-related, policies focused on geographical regions or nations may have disproportionate influences on certain racial groups and on cognitive development. Differences in health care, nutrition, regulation of environmental toxins, and geographic distribution of diseases and control strategies between the developing world and developed nations have all been subjects of policies or policy recommendations (see Health and intelligence). Health and intelligence are two closely-related aspects of human well-being

Eugenics

Main article: Eugenics

Eugenics advocates the improvement of human hereditary traits through various forms of intervention. Eugenics is a social Philosophy which advocates the improvement of Human Hereditary traits through various forms of intervention After World War II, both the public and the scientific communities associated eugenics with Nazi abuses, such as enforced racial hygiene, human experimentation, and the extermination of undesired population groups. World War II, or the Second World War, (often abbreviated WWII) was a global military conflict which involved a majority of the world's nations, including Nazism, which was a short name for National Socialism (Nationalsozialismus refers primarily to the Ideology and practices of the National Socialist German Racial hygiene (often labeled a form of " Scientific racism " is the selection by a government of the putatively most physical intellectual and moral persons to raise Human subject research (HSR or human subject use (HSU involves the use of human beings as research subjects Beginning in the 1980s, the history and concept of eugenics were again widely discussed as knowledge about genetics advanced significantly; developments in genetic, genomic, and reproductive technologies raised many new questions and concerns about eugenics and its ethical and moral status in the modern era. Genetics (from Ancient Greek grc-Latn genetikos, “genitive” and that from grc-Latn genesis, “origin” a discipline of Biology, is

A few scientific researchers such as psychologist Richard Lynn, psychologist Raymond Cattell, and doctor Gregory Stock have openly called for eugenic policies using modern technology, but they represent a minority opinion in current scientific and cultural circles. Richard Lynn (born 1930 is a British Professor Emeritus of Psychology who is known for his controversial views on racial and Raymond Bernard Cattell ( 20 March, 1905 – 2 February, 1998) was a British and American psychologist known for Gregory Stock is a biophysicist, best-selling author biotech entrepreneur and the former director of the Program on Medicine Technology and Society at UCLA ’s ^[48] One attempted implementation of a form of eugenics was a "genius sperm bank" (1980–99) created by Robert Klark Graham, from which nearly 230 children were conceived. The Repository for Germinal Choice (originally known as the Hermann J Robert Klark Graham ( June 9 1906 – February 13 1997) was born in Harbor Springs Michigan, USA In the U. S. and Europe, though, these attempts have frequently been criticized as in the same spirit of classist and racist forms of eugenics of the 1930s. Because of its association with compulsory sterilization and the racial ideology of the Nazi Party, the word eugenics is rarely used by the advocates of such programs.

Eugenicists have argued that immigration from countries with low national IQ is undesirable. IQ and Global Inequality is a Controversial 2006 book by Dr Richard Lynn, Professor Emeritus of Psychology at the University of Ulster According to Cattell, "when a country is opening its doors to immigration from diverse countries, it is like a farmer who buys his seeds from different sources by the sack, with sacks of different average quality of contents. "^[49]

In the book Eugenics: A Reassessment, Lynn argues that the condemnation of eugenics in the second half of the 20th century went too far. ^[50] He contends that the eugenic objectives of eliminating genetic diseases, increasing intelligence, and reducing personality disorders remain desirable and are achievable by human biotechnology. Biotechnology is Technology based on Biology, especially when used in Agriculture, Food science, and Medicine.

Test results

United States

The gaps found between the average intelligences of races or ethnicities varies depending on the populations studied and the content of the tests used. Black and white populations in the United States are the best studied. Black-White average IQ differences appear to increase with age, averaging approximately 17 points by age 24. ^[51] According to James Flynn, the overall average Black-White gap has reduced by one third over the last 30 years. ^[51] A large (21,260 children) and probably the most recent (1998) study found that the Black-White gap for young children in reading and math scores was much smaller than in earlier studies. Year 1998 ( MCMXCVIII) was a Common year starting on Thursday (link will display full 1998 Gregorian calendar) ^[52] Less controversially, Black-White differences on school achievement tests shrunk over the last 30 years, but some of the improvements did not continue through the 1990s. An achievement gap refers to the observed disparity on a number of Educational measures between the performance of groups of students especially groups defined by Gender The Black-White IQ gap also varies depending on test content. For example, two subsections of the WISC IQ test, known as forward and reverse digit-span, ask children to repeat a long series of numbers either forwards or backwards. The Black-White difference on forward digit span is relatively small, while the difference on reverse digit span is relatively large. Across a battery of tests, the size of the Black-White gap is correlated with the extent to which the tests measure the psychometric factor g, which also accounts for most of the variation in interindividual differences in IQ test performance. ^[53] Using a variety of statistical techniques, Dolan and colleagues have found that the Black-White IQ gap can be accounted for by differences in g and the other interindividual ability factors measured by IQ tests, and also that IQ tests measure roughly the same mix of abilities in both black and white populations. ^[54][55][56] Gaps are seen in other tests of cognitive ability or aptitude, including university admission exams such as the SAT and GRE as well as employment tests for corporate settings and the military^[57]. The SAT Reasoning Test (formerly Scholastic Aptitude Test and Scholastic Assessment Test) is a standardized test for College admissions in the

The IQ distributions of other racial and ethnic groups in the United States are less well studied. Hispanic and Native American populations, including Arctic Natives^[58][59], tend to score worse on average than White populations but better on average than Black populations. ^[60] East Asian populations may score higher on average than White populations in the United States as they do elsewhere. ^[61] Also Ashkenazi Jewish populations tend to score substantially higher on average than other populations of European ancestry. ^[62] For each of these populations, there is some evidence that the mixture of ability factors that distinguish individuals are differentially distributed between groups. For example, East Asian populations tend to outscore White populations on tests of visuospatial ability, whereas the test score differences skew towards higher verbal ability for Ashkenazi-White differences. However, the mixture of abilities within groups appears to be nearly identical across many ethnic groups. ^[63]The stability of these differences is also less well studied than Black-White differences.

Worldwide

According to Richard Lynn, J. Philippe Rushton, and others, IQ test score differences are observed cross-culturally and around the world. Richard Lynn (born 1930 is a British Professor Emeritus of Psychology who is known for his controversial views on racial and John Philippe Rushton (born December 3, 1943) is a Psychology professor at the University of Western Ontario, Canada, most widely Lynn has published three books summarizing IQ test scores from around the world. ^[64] The accuracy of the cross cultural IQ scores is highly controversial, but many scholars use the results as an estimate of world-wide IQ scores. ^{[65][66][67][68]} Lynn's meta-analysis lists East Asians (105), Europeans (99), Inuit (91), Southeast Asians and Amerindians (87 each), Pacific Islanders (85), Middle Easterners (including South Asians and North Africans) (84), sub-Saharan Africans (67), and Australian Aborigines (62). The European peoples are the various Nations and Ethnic groups of Europe. Inuit (plural the singular Inuk, means "man" or "person" is a general term for a group of culturally similar Indigenous peoples inhabiting For indigenous peoples in the United States other than Hawaii and Alaska see also Native Americans in the United States. The Pacific Ocean contains an estimated 20000 to 30000 Islands (the exact number has yet to be precisely determined The Middle East is a Subcontinent with no clear boundaries often used as a synonym to Near East, in opposition to Far East. North Africa or Northern Africa is the Northernmost Region of the African Continent, separated by the Sahara from Sub-Saharan Sub-Saharan Africa is a geographical term used to describe the area of the African continent which lies south of the Sahara, or those African countries Indigenous Australians are descendants of the first known human inhabitants of the Australian continent and its nearby islands. ^{[69][70] [71]} International achievement test scores, including TIMSS and PISA, have also been used to estimate average IQ world-wide with similar results where data is available. The Trends in International Mathematics and Science Study (TIMSS is an international assessment of the mathematics and science knowledge of fourth- and eighth-grade students around the ^{[72][73][74][68]} The very low IQ scores reported for sub-Saharan African populations is especially controversial. For example, Wicherts argues that the average IQ of sub-Saharan Africans is poorly measured and is more likely 78. ^[75] Sternberg, a critic of Rushton and Lynn, reported an average IQ of 70 for "young adolescents" in Kenya. ^[76] All commenters agree that IQ scores in developing countries are depressed to some extent by environmental conditions, such as macronutrient and micronutrient deficiencies.

Nature and nurture

The cause(s) of group average IQ test score differences are not known but hypotheses have been proposed. A hypothesis (from Greek) consists either of a suggested explanation for a phenomenon (an event that is observable or of a reasoned proposal suggesting a possible Many scholars have offered descriptions of the variety of hypotheses that have been proposed. These descriptions usually distinguish between those hypotheses which invoke a contribution of genetic factors and those which solely invoke environmental (i. e. , non-genetic) factors. Some descriptions of the positions are themselves controversial. In a review published in 2007, Hunt and Carlson listed four positions. ^[77] The first position, attributed to Jensen and Rushton, is that group differences in IQ reflect differences in intelligence that are "due in substantial part to genetically determined differences in brain structure and/or function"^[78] The second position, attributed to Ogbu and Sowell, is that the differences in intelligence test scores are due to social factors. The third view, attributed to Sternberg and colleagues, is that the use of IQ scores to argue for differences in intelligence is an inappropriate use of tests in different groups. The fourth position, attributed to Fish and others, is that there is no such thing as race: "a term motivated by social concerns and not a scientific concept". ^[79]

Prominent proponents of the genetic hypothesis are predominately psychologists or experts in intelligence testing, such as Charles Spearman, Hans Eysenck, Arthur Jensen, J. Philippe Rushton, Linda Gottfredson, Richard Herrnstein, and David C. Rowe. Charles Edward Spearman, FRS ( September 10 1863 - September 17 1945) was an English Psychologist known for work Hans Jürgen Eysenck ( March 4, 1916 in Berlin, Germany - September 4, 1997 in London, UK) was a Arthur Jensen (born August 24 1923) is a Professor Emeritus of Educational psychology at the University of California Berkeley. John Philippe Rushton (born December 3, 1943) is a Psychology professor at the University of Western Ontario, Canada, most widely Linda Susanne Gottfredson (born 24 June 1947) is a professor of Educational psychology at the University of Delaware and co-director of the Delaware- Richard J Herrnstein ( May 20 1930 – September 13 1994) was a prominent American researcher in animal David C Rowe ( 27 September 1949 – 2 February 2003) was an American Psychology professor known for his work studying A few prominent proponents have come from other fields, such as political scientist Charles Murray, evolutionary psychologist Satoshi Kanazawa, and philosopher Neven Sesardic. Charles Murray is the name of several notable people Charles Murray 1st Earl of Dunmore (1661–1710 Charles Murray 7th Earl of Dunmore Dr Satoshi Kanazawa (born November 16, 1962) is an Evolutionary psychologist at the London School of Economics. (Not to be confused with D Sesardic from the Department of Clinical Pharmacology at the Royal Postgraduate Medical School London Not all proponents share the same views, nor have all of their views been constant throughout their careers. The genetic hypothesis has also received support from scholars whose primary research is in other fields, such as William Shockley and James D. Watson. William Bradford Shockley ( February 13, 1910 &ndash August 12, 1989) was a British -born American Physicist Prominent critics come from many backgrounds, and hold a diversity of views. They include psychologists and experts in intelligence testing such as James Flynn (prior to his work on IQ Flynn was a political scientist), Ulric Neisser, Robert Sternberg, and a number of less well known psychometricians who criticize the underlying IQ test data. James Robert Flynn (born 1934 aka Jim Flynn, Emeritus Professor of Political Studies at the University of Otago in Dunedin, New Zealand, researches Ulric Neisser (born 8 December 1928) is an American Psychologist and member of the National Academy of Sciences. Robert J Sternberg (born December 8, 1949) is an American psychologist and psychometrician and the Dean of Arts and Sciences at Tufts University Psychometrics is the field of study concerned with the theory and technique of Educational and Psychological Measurement, which includes the measurement Other critics include economists Thomas Sowell and Roland G. Fryer Jr, anthropologists Ashley Montagu and Leonard Lieberman, sociologists John Ogbu and Claude S. Fischer, paleontologist Stephen J. Gould, and biologists Richard C. Lewontin and Jared Diamond. Thomas Sowell (born June 30, 1930) is an American Economist, social commentator and author of dozens of books Roland Gerhard Fryer Jr (born June 4, 1977 in Daytona Beach Florida) is a professor of Economics at Harvard University. Montague Francis Ashley Montagu (born Israel Ehrenberg on June 28 1905, East London England - died November 26 1999, Princeton New Jersey John Uzo Ogbu ( May 9 1939 – 20 August 2003) was a Nigerian-American anthropologist Claude Serge Fischer (born January 9, 1948) is an American Sociologist and Professor of Sociology at the University of California Berkeley Stephen Jay Gould (September 10 1941 &ndash May 20 2002 was a prominent American paleontologist, evolutionary biologist, and historian of science Richard Charles "Dick" Lewontin (born March 29, 1929) is an American Evolutionary biologist TemplateInfobox writer --> Jared Mason Diamond (b 10 September, 1937) is an American Evolutionary biologist

The genetic hypothesis has been characterized as inherently racist. For example, Turkheimer argues that proponents of a genetic contribution, whom he calls "racialists", deserve "vigorous disapprobation" and do not deserve "respect". ^[80] Turkheimer writes that he disagrees with his colleagues, such as Flynn and Ceci, who "agree that the question is a legitimate matter for scientific inquiry, to be settled by cool-headed evaluation of the empirical evidence". ^[81] Flynn does not accept Turkherimer's arguments. ^[82] Rushton and Jensen argue that the policy issues should be regarded as separate from the academic inquiry. ^[83]

What is heritability?

See also: Heritability of IQ

An environmental factor that varies between groups but not within groups can cause group differences in a trait that is otherwise 100% heritable. Study of the heritability of IQ is a controversial field of research that includes biology psychology philosophy sociology and anthropology In Genetics, Heritability is the proportion of phenotypic variation in a population that is attributable to genetic variation among individuals The height of this "ordinary genetically varied corn" is 100% heritable, but the difference between the groups is totally environmental. This is because the nutrient solution varies between populations, but not within populations. ^[84]

The consensus among intelligence researchers is that IQ differences between individuals of the same racial-ethnic group reflect real, functionally and socially significant, and substantially heritable differences in intelligence. ^{[85][86][87][88][89][90][91][92][93]}

The nature versus nurture debates concern the relative importance of an individual's inherited qualities ("nature") versus personal experiences and cultural environment ("nurture") in determining or causing individual differences in physical and behavioral traits. The nature versus nurture debates concern the relative importance of an individual's innate qualities ("nature" i Determinism is the philosophical Proposition that every event including human cognition and behaviour decision and action is causally determined Causality (but not causation) denotes a necessary relationship between one event (called cause and another event (called effect) which is the direct consequence Physiology (from Greek grc φύσις physis, "nature origin" and grc -λογία -logia) is the study of the mechanical physical Behavior or behaviour (see spelling differences) refers to the actions or Reactions of an object or Organism, usually Often the heritability of a trait is used to estimate the relative contribution of genetic and environmental factors to the variation seen in a phenotype within a population, sometimes this is presented as a percentage and sometimes as a simple proportion. In Genetics, Heritability is the proportion of phenotypic variation in a population that is attributable to genetic variation among individuals In Probability theory and Statistics, the variance of a Random variable, Probability distribution, or sample is one measure of A phenotype is any observable characteristic of an Organism, such as its morphology, Development, biochemical or physiological properties For example, a heritability of 50% (or 0. 5) means that half of the variation between individuals in a group is associated with genetic differences between individuals and half of the variation is associated with non-genetic differences. Heritability cannot distinguish genetic and environmental contributions to the phenotype of a particular person, and it does not measure the direct effect of any genetic or environmental factor on a trait or phenotype. Instead, it captures the effects of the genetic and environmental factors that actually vary within a population. ^[94] Thus, a heritability of 100% does not mean that environmental factors are irrelevant for development, and a heritability of 0% does not mean that genetic factors are irrelevant for development. In Genetics, Heritability is the proportion of phenotypic variation in a population that is attributable to genetic variation among individuals Reported heritability of IQ from twin studies and other study designs consistently fall in the range of 50% to 80%, with the estimated heritability in young (preschool) children in the lower range and adults in the higher range.

Critics have also questioned the interpretation of heritability. Lewontin suggests that some genotypes are more influenced by environments than others, leading to the possibility that populations that have similar genetic variance in the same environment can have different heritabilities because of their different genotypes. ^[95] David Layzer (1974) contends that the development of a trait can be influenced by genetic differences qualitatively and that heritability estimates cannot measure such qualitative differences, as such it is possible that even with a heritability of close to 100% it is possibly for phenotypic variance to be due largely to environment. In the vernacular quality can mean a high degree of excellence (“a quality product” a degree of excellence or the lack of it (“work of average quality” or a property of ^[96]

Genetic hypothesis

Socioeconomic status (SES) varies both between and within populations, but Black-White differences in IQ persist among the children of parents matched for SES, and the gap is largest among the children of wealthiest and best educated parents. ^[97]

Much of the research on explaining group differences stems from an observation promoted first by Arthur Jensen and later James Flynn and others regarding an environmental explanation for group differences. According to Jensen^[98] and Flynn^[99], the very high within-group heritability of IQ (within both white and black populations) presents a problem for environmental explanations of group differences in IQ. In Genetics, Heritability is the proportion of phenotypic variation in a population that is attributable to genetic variation among individuals They consider two general classes of environmental factors: common environmental factors and X-factors. Common environmental factors vary within and between populations. X-factors vary between populations, but do not vary substantially within populations. They first consider common environmental factors. To account for a 1 SD B-W IQ gap only in terms of common environmental factors would require very large environmental differences. For example, if the within-group heritability of IQ is 80%, then a B-W IQ difference of 2. 24 SD in common environmental factors is required. For a heritability of 40%, a difference of 1. 29 SD is required. Jensen and Flynn agree that it is an empirical question whether common environmental factors that influence IQ differ between whites and blacks to such an extent, and both agree that most commonly suggested environmental factors do not. Jensen believes that empirical evidence supports the view that the B-W IQ gap is caused by both common environmental factors and genetic factors. Flynn disagrees and believes that empirical evidence supports the view that the B-W IQ gap is caused by yet unrecognized environmental factors.

The alternative to common environmental factors is to hypothesize that X-factors account for the B-W IQ gap. A frequently-cited example from Lewontin describes the effect of a hypothetical X-factor. Imagine that the height of "ordinary genetically varied corn" is 100% heritable when grown in a uniform environment. Further imagine that two populations of corn are grown: one in a normal nutrient environment and the other in a deficient nutrient environment. Consequently, the average height of the corn grown in the deficient nutrient environment is less than the average height of the corn grown in the normal environment. In such a scenario, the within-group heritability of height is 100% in both populations, but the substantial difference between group are due entirely to environmental factors. The quality of the nutrient is an "X-factor" in the language of Jensen and Flynn. With respect to the B-W IQ gap, Jensen suggests that effects associated with racism (both overt and institutionalized racism) might be X-factors. Institutional Racism (or structural racism or systemic racism) refers to a form of Racism which occurs specifically in institutions such as public Flynn believes that attributing the B-W gap to the effects of racism is incorrect, because the most plausible ways in which discrimination could affect IQ are themselves common environmental factors. These may include psychological effects such as stereotype threat; biological effects such as poor nutrition, health care and living close to toxic environments; and educational effects such as a lack of good schools. Stereotype threat is the fear that one's behaviour will confirm an existing Stereotype of a group with which one identifies Instead, Flynn and his colleague William Dickens have developed more complicated models to explain the black-white gap in terms of environmental factors. One initial motivation of the Dickens-Flynn theory was Flynn's observation that IQ test scores have been rising over time in countries around the world – termed the Flynn effect. The Flynn effect is the rise of average Intelligence Quotient (IQ test scores over the generations an effect seen in most parts of the world although at greatly varying Flynn and others believe an explanation for the Flynn effect may elucidate the cause of the B-W gap. Jensen and others disagree.

A few of the notable proponents of the partly genetic hypothesis are Raymond B. Cattell, Arthur Jensen and Hans Eysenck. Raymond Bernard Cattell ( 20 March, 1905 – 2 February, 1998) was a British and American psychologist known for Arthur Jensen (born August 24 1923) is a Professor Emeritus of Educational psychology at the University of California Berkeley. Hans Jürgen Eysenck ( March 4, 1916 in Berlin, Germany - September 4, 1997 in London, UK) was a

Rushton and Jensen examined 10 categories of research evidence from around the world to contrast "a hereditarian model" (50% genetic-50% cultural) and a culture-only model (0% genetic-100% cultural). John Philippe Rushton (born December 3, 1943) is a Psychology professor at the University of Western Ontario, Canada, most widely Arthur Jensen (born August 24 1923) is a Professor Emeritus of Educational psychology at the University of California Berkeley. Their article "Thirty Years of Research on Race Differences in Cognitive Ability" was published in the APA journal Psychology, Public Policy and Law showing evidence that they believe supports the hereditarian model. ^[100][101] Rushton and Jensen (2005a) believe that the best explanation for the gap is that 50%-80% of the group differences in average US IQ is genetic. ^[102]

Other evidence, such as the Minnesota Transracial Adoption Study, certain racial admixture studies, behavior genetic modeling of group differences, "life-history" traits, and evolutionary explanations have also been proposed to indicate a genetic contribution to the IQ gaps and explain how these arose. The Minnesota Transracial Adoption Study examined the IQ test scores of 130 black / Interracial children adopted by advantaged white families ^[103].

Environmental hypotheses

Critics of the significantly genetic view, such as Robert Sternberg, argue that these studies are either flawed and thus inconclusive, or else that they support a primarily environment (<20% genetic) hypothesis. Robert J Sternberg (born December 8, 1949) is an American psychologist and psychometrician and the Dean of Arts and Sciences at Tufts University ^[104] For example, Dolan and Hamaker (2001) argue that the statistical methods linking the Black-White gap to g are insufficient. They reanalyzed the data from several earlier studies and concluded that Spearman's hypothesis is not an "empirically established fact" (i. e. , that Black-White IQ differences may be due to differences in common factors other than g) due to insufficient power in the data to choose between alternative models. "This leaves the validity of Spearman's hypothesis, considered a central justification for the genetic explanation, an unresolved question. " However, they did confirm that the Black-White IQ gap is not due to measurement artifacts, and is instead due to some measured factor that varies both within and between groups.

Nisbett (2005) argues that many studies find results that do not support the genetic hypothesis. They include studies on IQ and skin color that reported that the average correlation between skin color and IQ is . 1 (the average correlation between IQ and judged “Negroidness” of features is even lower); IQ and self-reported European ancestry; IQ and blood groups showing degree of European Ancestry; IQ among children in post WWII Germany born to black and white American soldiers; and IQ among mixed-race children born to either a black or a white mother. He argues that these are direct tests of the genetic hypothesis and of more value than indirect variables, such as skull size and reaction time. He argues that "There is not a shred of evidence in this literature, which draws on studies having a total of five very different designs, that the gap has a genetic basis. " He argues further that many intervention and adoption studies also find results that do not support the genetic hypothesis. He also argues "that the Black-White IQ gap has lessened considerably in recent decades. "^[105] Hunt and Carlson^[106] argue that Nisbett's interpretations are far too strong in light of problems with these studies that have been recognized for decades. ^[107] Gottfredson writes that the studies Nisbett cites "actually lack the ability to rule out any hypothesis at all, genetic or not"^[108].

Dickens (2005) states that "Although the direct evidence on the role of environment is not definitive, it mostly suggests that genetic differences are not necessary to explain racial differences. Advocates of the hereditarian position have therefore turned to indirect evidence. . . The indirect evidence on the role of genes in explaining the black-white gap does not tell us how much of the gap genes explain and may be of no value at all in deciding whether genes do play a role. Because the direct evidence on ancestry, adoption, and cross-fostering is most consistent with little or no role for genes, it is unlikely that the black-white gap has a large genetic component. "^[109]

Fryer and Levitt (2006), with data from "the first large, nationally representative sample" of its kind, report finding only a very small racial difference when measuring mental function for children aged eight to twelve months, and that even these differences disappear when including a "limited set of controls". "On tests of intelligence, Blacks systematically score worse than Whites, whereas Asians frequently outperform Whites. Some have argued that genetic differences across races account for the gap. Using a newly available nationally representative data set that includes a test of mental function for children aged eight to twelve months, we find only minor racial differences in test outcomes (0. 06 standard deviation units in the raw data) between Blacks and Whites that disappear with the inclusion of a limited set of controls. The only statistically significant racial difference is that Asian children score slightly worse than those of other races. To the extent that there are any genetically-driven racial differences in intelligence, these gaps must either emerge after the age of one, or operate along dimensions not captured by this early test of mental cognition. " They argue that their report poses "a substantial challenge to the simplest, most direct, and most often articulated genetic stories regarding racial differences in mental function. " They conclude that "to the extent that there are any genetically-driven racial differences in intelligence, these gaps must either emerge after the age of one, or operate along dimensions not captured by this early test of mental cognition. "^[110]

The Flynn effect

The secular, international increase in test scores, commonly called the Flynn effect, is seen by Flynn and others as reason to expect the eventual convergence of average black and white IQ scores. The Flynn effect is the rise of average Intelligence Quotient (IQ test scores over the generations an effect seen in most parts of the world although at greatly varying Flynn argues that the average IQ scores in several countries have increased about 3 points per decade during the 20th century, which he and others attribute predominantly to environmental causes. ^[111] This means, given the same test, the mean performance of Black Americans today could be higher than the mean for White Americans in 1920, though the gains causing this appear to have occurred predominantly in the lower half of the IQ distribution. African Americans or Black Americans are citizens or residents of the United States who have origins in any of the black populations of Africa ^[112] If an unknown environmental factor can cause changes in IQ over time, they argue, then contemporary differences between groups could also be due to an unknown environmental factor. An added complication to this hypothesis is the question of whether the secular IQ gains can be predominantly a real change in cognitive ability. Flynn's face-value answer to this question is "No",^[113] and some other researchers have found reason to concur. In terms of the mixture of ability factors that IQ tests were designed to measure, such as g and verbal and mathematical ability, changes in IQ scores over time are different than either within-group individual differences and between group differences. ^[114][115] For example, there has been little increase over time in performance on either the forward digit-span or reverse digit-span subtests, and tests of school achievement have been less affected than tests of abstract reasoning. ^[116] Other recent studies have found that g has improved substantially. ^[117][118] Cranial vault size has increased and the shape changed during the last 150 years in the US; these changes must occur by early childhood because of the early development of the vault. The cranial vault is the space in the Skull within the neurocranium. ^[119]

Health

Percentage of children aged 1-5 with blood lead levels at least 10 µg/dL. Black and hispanic children have measureably higher levels than white children. High levels of lead at an early age may affect intellegence.

Main article: Health and intelligence

Main article: Race and health

Numerous explanations beside genetics have been proposed to account for the IQ gaps in the U. Health and intelligence are two closely-related aspects of human well-being Race and health research is mostly from the United States. It has found both current and historical racial differences in the frequency treatments and availability of treatments S. ^[120] High rates of low birth-weight babies, lower rates of breastfeeding, and exposure to toxins are some factors. The Flynn effect is often cited as evidence that average IQ scores have changed greatly and rapidly, for reasons poorly understood, thus the IQ gap between races could change in the future or is changing, especially if the Flynn effect started earlier for Whites. The Flynn effect is the rise of average Intelligence Quotient (IQ test scores over the generations an effect seen in most parts of the world although at greatly varying

High levels of lead at an early age may affect intelligence; studies indicate that black and hispanic children have measurably higher levels than white children. A 10 µg/dL increase in blood lead at 24 months of age is associated with a 5. 8-point lower IQ later in life. ^[121] In 1976 77. Year 1976 ( MCMLXXVI) was a Leap year starting on Thursday (link will display full calendar of the Gregorian calendar. 8% of all children had at least this much lead in their blood. ^[122]]] Exposure to lead is frequently attributed to housing conditions including lead based paint, which is no longer used but has accumulated in older buildings; people of lower economic means are more frequently exposed to lead from housing.

Stereotype threat

Main article: Stereotype threat

Stereotype threat is the fear that one's behavior will confirm an existing stereotype of a group with which one identifies; this fear may in turn lead to an impairment of performance. Stereotype threat is the fear that one's behaviour will confirm an existing Stereotype of a group with which one identifies A stereotype (from Greek: stereo + týpos = "solid impression" is a generalized perception of first impressions behaviors presumed by a group ^[123] Testing situations that highlight the fact that intelligence is being measured tend to lower the scores of individuals from racial-ethnic groups that already score lower on average. Stereotype threat conditions cause larger than expected IQ differences among groups but do not fully explain the gaps found in non-threatening test conditions.

Quality of education

Some researches have written that studies that find test performance gaps between races even after adjusting for education level, such as the analysis found in The Bell Curve, fail to adjust for the quality of education. Not all high school graduates or college graduates have received the same quality of education. A 2006 study reported that that years of education is an inadequate measure of the educational experience among multicultural elders, and that adjusting for quality of education greatly reduced the overall effect of racial differences on the tests. ^[124] A 2004 study reported that quality of education and cultural experience influence how older African Americans approach neuropsychological tasks and concluded that adjustment for these variables may improve specificity of neuropsychological measures. ^[125] Yet another study reported that, although significant differences were observed between the ethnic groups when matched for years of education, equating for literacy level eliminated all performance differences between African Americans and Whites on both cancellation tasks which assess visual scanning. ^[126](Like reaction time tests cancellation task tests are sometimes regarded as "culture free" tests of intelligence. ) Eric A. Hanushek and Steven G. Rivkin wrote in their 2006 book that unequal distributions of inexperienced teachers and of racial concentrations in schools can explain all of the increased achievement gap between grades 3 and 8. ^[127]

A 2004 study in South Africa found highly significant effects for both level and quality of education within the black African first language groups taking the Wechsler IQ tests. The Republic of South Africa (also known by other official names) is a country located at the southern tip of the continent of Africa Scores black African first language groups with advantaged education were comparable with the US standardization, whereas scores for black African first language participants with disadvantaged education were significantly lower than this. The study cautioned that faulty conclusions may be drawn about the effects of ethnicity and the potential for neuropsychological misdiagnosis. Neuropsychology is the applied scientific discipline that studies the structure and function of the Brain related to specific psychological processes and overt behaviors Medical Error is an inaccurate or incomplete diagnosis and/or Treatment of a Disease; Injury; Syndrome; ^[128]

Racial discrimination in education

Roslyn Arlin Mickelson writes that racial discrimination in education arises from actions of institutions or individual state actors, their attitudes and ideologies, or processes that systematically treat students from different racial/ethnic groups disparately or inequitably. ^[129] Despite advancement in education reform efforts, to this day African American students continue to experience inequities within the educational system. Hala Elhoweris , Kagendo Mutua, Negmeldin Alsheikh and Pauline Holloway conducted a study of the effect of students' ethnicity on teachers' educational decision making. The results of this study indicated that the student's ethnicity did make a difference in the teachers' referral decisions for gifted and talented educational programs. Gifted education (also known as Gifted and Talented Education ( GATE) Talented and Gifted ( TAG) or G/T) is a broad term for special ^[130]Recently, a number of scholars have examined the issue of disproportionate representation of minority students in special education programs ^[131][132]

Teachers' perceptions of a students cultural background may effect school achievement. Special Education is the individually planned and systematically monitored arrangement of teaching procedures adapted equipment and materials accessible settings and other interventions African American students with African American cultural backgrounds, for example, have been found to benefit from culturally responsive teaching. ^[133] In a 2003 study researchers found that teachers perceived students with African American culture-related movement styles as lower in achievement, higher in aggression, and more likely to need special education services than students with standard movement styles irrespective of race or other academic indicators. ^[134]

Ellis Cose writes that low expectations may have a negative impact on the achievement of minorities. He writes that black people did not need to read The Bell Curve to be aware of the low expectations held for them by the majority culture. He recalls examples of low expectations from his teachers in school who regarded his use of AAVE as "laziness" and teachers who did not feel it was important to purchase new text books because they did not expect the students to be able to read anything complex. African American Vernacular English ( AAVE) – also called African American English; less precisely Black English, Black Vernacular, He contrasts these low expectations with the high expectations philosophy of Xavier University where, using the ideas Whimbey articulated in his book Intelligence can be Taught teachers created a program called SOAR. Xavier University of Louisiana is a private coed liberal arts historically Black Roman Catholic University located in New Orleans Louisiana SOAR raised the performance of black students and lead Xavier to become the university that sends the greatest number of black students to medical school in the United States. The SOAR program produced gains equivalent to 120 points on an SAT test. The SAT Reasoning Test (formerly Scholastic Aptitude Test and Scholastic Assessment Test) is a standardized test for College admissions in the Cose writes that ". . we must treat people, whatever their color, as if they have unlimited intellectual capacity. "^[135]

Caste-like minorities

The book Inequality by Design: Cracking the Bell Curve Myth claims that it is not lower average intelligence that leads to the lower status of ethnic minorities, it is instead their lower status that leads to their lower average intelligence test scores. Inequality by Design Cracking the Bell Curve Myth is a book by Claude S The following table from the same book compares social status or caste position to test scores and school success in nations around the world. Castes are Hereditary systems of occupation, Endogamy, social culture, Social class, and Political power. ^[136]

Notes:

1. Czechoslovakia split into the Czech Republic and Slovakia in 1993. The United States of America —commonly referred to as the White People is the second album by Handsome Boy Modeling School. The term black people usually refers to a racial group of Humans with dark Skin color, but the term has also been used to categorise a number of diverse Native Americans in the United States are the indigenous peoples from the regions of North America now encompassed by the continental United States See also Kingdom of Great Britain Great Britain (Breatainn Mhòr Prydain Fawr Breten Veur Graet Breetain is the larger of the two main islands The English people (from the adjective in Englisc) are a Nation and Ethnic group native to England who predominantly speak English The Irish people ( Irish: Muintir na hÉireann, na hÉireannaigh, na Gaeil) are a Western European Ethnic group who originate The Scots people ( Scots Gaelic: Albannaich) are a Nation and an Ethnic group indigenous to Scotland. Northern Ireland (Tuaisceart Éireann Ulster Scots: Norlin Airlann) is a Country within the United Kingdom, lying in the northeast of Protestantism refers to the forms of Christian faith and practice that originated in the 16th century Protestant Reformation. Catholic is an Adjective derived from the Greek adjective '' / 'katholikos' meaning "whole" or "complete". For a topic outline on this subject see List of basic Australia topics. Indigenous Australians are descendants of the first known human inhabitants of the Australian continent and its nearby islands. New Zealand is an Island country in the south-western Pacific Ocean comprising two main landmasses (the North Island and the South Island This article discusses the Māori people of New Zealand For their language see Māori language, and for other meanings see Māori (disambiguation. The Republic of South Africa (also known by other official names) is a country located at the southern tip of the continent of Africa The term Afrikaner people refers to white Afrikaans -speaking people who have been established in Southern Africa since the 17th century and are mainly of northwestern The Kingdom of Belgium is a Country in northwest Europe. It is a founding member of the European Union and hosts its headquarters as well as those The terms Fleming and Flemings ( Vlaming and Vlamingen in Dutch) denote respectively a person and people and the Flemings or Walloons (Wallons Walons are a Romance people living in Belgium principally in Wallonia. For a topic outline on this subject see List of basic Israel topics. PLEASE TAKE NOTE************ The araB gene Promoter is a bacterial promoter activated by e L-arabinose binding India, officially the Republic of India (भारत गणराज्य inc-Latn Bhārat Gaṇarājya; see also other Indian languages) is a country Brahmin ( Brāhmaṇa, sa ब्राह्मणः is the class of educators scholars and preachers in Brahminical Hinduism. Dalit is a self designation for group of people of South Asian descent who were traditionally regarded as untouchables or low Caste. Czechoslovakia may also refer to what is now the Czech Republic and Slovakia. } The Slovaks or Slovakians are a western Slavic People that primarily inhabit Slovakia and speak the Slovak language, which is The Romani people (singular Rom, plural Roma as a Noun; also known as Romanies or Roma people) are an ethnic group with origins For a topic outline on this subject see List of basic Japan topics. Burakumin (ja {{linktext 部 落 民}} buraku, tribe + min, people is a term often used to describe a Japanese social Minority group. The Czech Republic ( ˈt͡ʃɛskaː ˈrɛpuˌblɪka short form in Česko ˈt͡ʃɛskɔ also called Czechia, Slovakia (long form Slovak Republic; Slovak:, long form, is a Landlocked country in Central Europe with a population of over five million
2. The Flemish are not a minority in Belgium. The PISA 2006 results for schoolchildren 15 years of age showed that the Flemish outperformed the Walloons (French). Walloons (Wallons Walons are a Romance people living in Belgium principally in Wallonia. ^[149]
3. Afrikaans speakers make up the majority of the white population; most South Africans, however, identified themselves in the census as black, and speak one of the Bantu languages as their home language^[150]

Fluid intelligence

A recent theory hypothesizes that a portion of fluid cognition (gF) may be separable from general intelligence (g), and that portion, called gF', may be very susceptible to environmental factors, in particular early childhood stress. The Bantu languages (technically Narrow Bantu languages) constitute a grouping belonging to the Niger-Congo family Home language is a term widely used for a language spoken in the home that is different from the main language spoken in the society In Psychology, fluid and crystallized intelligence (abbreviated gF and gC, respectively are factors of General intelligence originally Some IQ tests, especially those used with children, are poor measures of gF', which means that the effect of the environment on intelligence regarding racial differences, the Flynn effect, early childhood intervention, and life outcomes may have been underestimated in many studies. The article has received numerous peer commentaries for and against. ^[151]

Viewpoints of notable scientists and researchers

See also: Snyderman and Rothman (study)

Researchers who believe that there is no significant genetic contribution to race differences in intelligence include Flynn (1980), Brody (1992), Neisser et al. The Snyderman and Rothman study uncovered supposed liberal bias in reporting on Race and intelligence. (1996), Nisbett (1998), Mackintosh (1998), Jencks and Phillips (1998), and Fish (2002). Some scientists who emphasize cultural explanations do not necessarily exclude a small genetic influence. Reynolds (2000) suggests up to 20% genetic influence be included in the cultural explanation. Researchers who believe that there are significant genetic contributions to race differences in intelligence include McGurk (1953), Garrett (1961), Shuey (1966), Shockley (1968), Eysenck (1971), Baker (1974), Loehlin et al. (1975), Vernon (1979), Lynn (1991a), Waldman et al. (1994), Scarr (1995), Levin (1997), Jensen (1998b), Rushton (2000), and Gottfredson (2005b). ^[152] Coming advances in genetics and genomics are expected to soon provide the ability to test hypotheses about group differences more rigorously than has as yet been possible. Genetics (from Ancient Greek grc-Latn genetikos, “genitive” and that from grc-Latn genesis, “origin” a discipline of Biology, is Genomics is the study of an organism's entire Genome. The field includes intensive efforts to determine the entire DNA sequence of organisms and fine-scale Genetic ^[153]

Interpretations

Given the observed differences in IQ scores between certain groups, a great deal of debate revolves around the significance of these observations. Various interpretations of test data lead to a multitude of conflicting conclusions as to which specific explanations the data support.

Jared Diamond's Guns, Germs and Steel instead argues that historical differences in economic and technological development for different geographic areas can be explained by differences in geography (which affects factors like population density and spread of new technology) and differences in available crops and domesticatable animals. TemplateInfobox writer --> Jared Mason Diamond (b 10 September, 1937) is an American Evolutionary biologist Guns Germs and Steel The Fates of Human Societies is a 1997 book by Jared Diamond, professor of Geography and Physiology at UCLA Richard Nisbett argues in his 2004 The Geography of Thought that some of these regional differences shaped lasting cultural traits, such as the collectivism required by East Asian rice irrigation, compared with the individualism of ancient Greek herding, maritime mercantilism, and money crops wine and olive oil ^[154] However, it has been suggested that these environmental differences may operate in part by selecting for higher levels of IQ. Richard Nisbett is Theodore M Newcomb Distinguished Professor of Social psychology and co-director of the Culture and Cognition program at the University of Michigan Irrigation is an artificial application of water to the soil usually for assisting in growing crops The term ancient Greece refers to the period of Greek history lasting from the Greek Dark Ages ca Natural selection is the process by which favorable Heritable traits become more common in successive Generations of a Population of ^[155]

J. Philippe Rushton, a professor of psychology at the University of Western Ontario and the current head of the Pioneer fund, has written a controversial book called Race, Evolution, and Behavior: A Life History Perspective. John Philippe Rushton (born December 3, 1943) is a Psychology professor at the University of Western Ontario, Canada, most widely The University of Western Ontario (known as Western, as well as UWO or Western Ontario) is a public research University located in London The Pioneer Fund is a US non-profit foundation established in 1937 "to advance the scientific study of heredity and human differences Summary Rushton argues that Mongoloids Caucasoids and Negroids fall consistently into the same Rushton claims in the book that race is a valid biological concept and that racial differences frequently arrange in a continuum of Mongoloids (Orientals, East Asians) at one extreme, Negroids (blacks, Africans) at the opposite extreme, and Caucasoids (whites, Europeans) in the middle. The term " Mongoloid " is a variation of the word "Mongol" meaning "Mongol-like" See also Black people Negroid is an Adjective derived from the term Negro and refers to a presumed race of people mostly from The Caucasian race, sometimes the Caucasoid race, is a term of Racial classification, coined around 1800 by Johann Friedrich Blumenbach for the " It has been heavily criticized. ^[156]

Differing rates of economic growth have also been attributed to numerous factors other than racial IQ gaps such as local availability of resources, climate, and sociopolitical factors. See for example the Global Competitiveness Report, the Ease of Doing Business Index, and the Index of Economic Freedom or works by Kenneth Pomeranz^[157], Eric Jones^[158], Joel Mokyr^[159], and Douglass C. North^[160]. The Global Competitiveness Report is a yearly report published by the World Economic Forum. The Ease of Doing Business Index is an index created by the World Bank. The Index of Economic Freedom is a series of 10 economic measurements created by the Wall Street Journal and The Heritage Foundation to measure the degree of Economic freedom Kenneth Pomeranz (born 1958 is a professor in the history department at the University of California Irvine in the US. Eric Jones may refer to Sir Eric Malcolm Jones, British intelligence officer Eric Jones (NASCAR driver Eric Jones Joel Mokyr (PhD Yale 1974 is the Robert H Strotz Professor of Arts and Sciences at Northwestern University. Douglass Cecil North (born November 5, 1920) was the co-recipient (with Robert William Fogel) of the 1993 Nobel Memorial Prize in Economic Sciences

Criticisms

Outdated methodology

A 2006 paper by Professor Denny Borsboom argues that mainstream contemporary test analysis does not reflect substantial recent developments in the field and "bears an uncanny resemblance to the psychometric state of the art as it existed in the 1950s. "^[161]It also claims that some of the most influential recent studies on group differences in intelligence, in order to show that the tests are unbiased, use outdated methodology. In particular the reliance on classical test theory rather than more sophisticated measurement models as found in item response theory. Classical test theory is a body of related Psychometric theory that predict outcomes of psychological testing such as the difficulty of items or the ability of In Psychometrics, item response theory (IRT is a body of theory describing the application of Mathematical models to Data from Questionnaires

Utility of research

Theories of race and intelligence have been challenged on grounds of their utility. In Economics, utility is a measure of the relative satisfaction from or desirability of Consumption of various Goods and services. Critics want to know what purpose such research could serve and why it has been an intense an area of focus for a few researchers. Some defend the research, saying it has egalitarian aims or that it is pure science; others say that the true motivation for the research is the same as that of the eugenics movement and other forms of scientific racism. Fundamental science is the part of Science that describes the most basic Objects Forces relations between them and laws governing them such that all other Eugenics is a social Philosophy which advocates the improvement of Human Hereditary traits through various forms of intervention Scientific racism denotes the use of scientific or ostensibly scientific findings and methods to support or validate racist attitudes and worldviews ^[162][163] Even supporters of intelligence research have described such research as analogous to "working with dynamite" or "dangerous play" in sports. ^[164]

As to whether research in this area is desirable, John C. Loehlin wrote in 1992, "Research on racial differences in intelligence is desirable if the research is appropriately motivated, honestly done, and adequately communicated. John Clinton Loehlin (born 1926 is an American behavior geneticist and Psychology and Computer science Professor emeritus " [emphasis original] Defenders of the research suggest that both scientific curiosity and a desire to draw benefits from the research are appropriate motivations. Researchers such as Richard Lynn have suggested that conclusions from the research can help make political decisions, such as the type of educational opportunities and expectations of achievement policy makers should have for people of different races. Richard Lynn (born 1930 is a British Professor Emeritus of Psychology who is known for his controversial views on racial and Charles Murray, a political scientist of the American Enterprise Institute has used their conclusions to criticize social programs based on racial equality that fail, he claims, to recognize the realities of racial differences. Charles Murray is the name of several notable people Charles Murray 1st Earl of Dunmore (1661–1710 Charles Murray 7th Earl of Dunmore The American Enterprise Institute for Public Policy Research (AEI is a conservative Think tank, founded in 1943

Test construction

While the existence of average IQ test score differences has been a matter of accepted fact for decades, a great deal of controversy exists among scholars over the question of whether these score differences reflected real differences in cognitive ability. Some claim that there is no evidence for test bias since IQ tests are equally good predictors of IQ-related factors (such as school performance) for U. S. Blacks and Whites. ^[165] The performance differences persist in tests and testing situations in which care has been taken to eliminate bias. ^[165] It has also been suggested that IQ tests are formulated in such a way as to disadvantage minorities. ^[165] Controlled studies have shown that test construction does not substantially contribute to the IQ gap. ^[165] However, some psychometricians are not satisfied that the question of test bias is fully answered by these results. ^{[166][167][168]} Also, all commenters reject the common misconception that IQ is meant to measure "innate" differences in intelligence, and they agree that average IQ scores on their own say nothing about the cause of the differences.

The preponderance of evidence indicates that IQ tests measuring general intelligence are crossculturally valid. There is little or no evidence of population-specific cultural effects apart from the obvious example of language bias. ^[169] For example, Robert Sternberg et al. Robert J Sternberg (born December 8, 1949) is an American psychologist and psychometrician and the Dean of Arts and Sciences at Tufts University found that the IQ of 12- to 15-year-old Kenyans predicted school grades at about the same level as they do in the West. ^[170] IQ also predicted university performance equally well in African and non-African engineering students in South Africa in a 2004 study. ^[171] Salgado et al. (2003) demonstrated the international generalizability of general mental ability across 10 member countries of the European Community and differences in a nation’s culture, religion, language, socioeconomic level or employment legislation did not affect the predictive validity of IQ tests. The European Community (EC is one of the Three pillars of the European Union (EU created under the Maastricht Treaty (1992 ^[172]

However, other studies have found evidence for bias. A 2005 study finds some evidence that the WAIS-R is not culture-fair for Mexican Americans. ^[173] Other recent studies have questioned the culture-fairness of IQ tests when used in South Africa. ^[174][175]

Source of funding

Proponents of genetic explanations of race/IQ correlation, such as Rushton, Lynn, and Jensen, have often been criticized for their intimate links with groups that have historic ties to Nazis and eugenics of the early 19th century, such as the Pioneer Fund. The Pioneer Fund is a US non-profit foundation established in 1937 "to advance the scientific study of heredity and human differences It has been characterized by the Southern Poverty Law Center as a hate group. The Southern Poverty Law Center ( SPLC) is an American Non-profit legal organization internationally known for its tolerance education programs its legal A hate group is an organized group or movement that advocates Hate, Hostility, or Violence towards members of a race ethnicity religion gender sexual Rushton is the current head of the Pioneer Fund and has spoken at conferences of the American Renaissance magazine, in which he has also published articles. For the magazine about renaissance faires see Renaissance Magazine American Renaissance (abbreviated AR or AmRen) is a monthly [3] Anti-racist Searchlight Magazine described one of these as a "veritable 'who’s who' of American white supremacy. Searchlight is a British Anti-fascist Magazine, founded in 1975 which publishes exposés about Racism, Antisemitism White supremacy is a racist ideology based on the assertion that White people are superior to other racial groups. "[4]. Beverly Daniel Tatum writes that dominant cultures often set the parameters by which minority cultures will be judged. Minority groups are labeled as substandard in significant ways: for example, blacks have historically been characterized as less intelligent than whites. Tatum suggests that the ability to set these parameters is a form of white privilege. White privilege is a sociological concept that describes advantages purportedly enjoyed by white persons beyond that which is commonly experienced by non-white people in ^[176]

Proponents of genetic explanations of race/IQ correlation have in turn accused their critics of suppressing scientific debate in the name of political correctness. Scientific misconduct is the violation of the standard codes of scholarly conduct and ethical behavior in Professional scientific research. They claim harassment and interference with both their work and funding. The Pioneer Fund, whose stated purpose is "to advance the scientific study of heredity and human differences", makes "no grants to individuals but only to research institutions, mainly universities, mostly for specialized 'niche' projects, which have difficulty attracting funds from government sources or from larger foundations". ^[177]

See also

Theories of Race and Intelligence:

• Hominid intelligence

Publications of Race and Intelligence:

• IQ and the Wealth of Nations
• IQ and Global Inequality (follow-up to IQ and the Wealth of Nations)
• The Mismeasure of Man
• Race Differences in Intelligence

Theories of other Intelligence links:

• Brain to body mass ratio
• Height and intelligence
• Neuroscience and intelligence
• Sex and intelligence

Notes

References

External links

Collective statements

• APA Task Force Examines the Knowns and Unknowns of Intelligence
• Statement on "Race" and Intelligence. American Anthropological Association. Founded in 1902 the American Anthropological Association (AAA is the world’s largest professional organization of scholars and practitioners in the field of Anthropology. Adopted December 1994.
• Mainstream Science on Intelligence. Intelligence, v24 n1 p. 13–23 Jan–Feb 1997

Review papers

• James Flynn and Charles Murray debate – news summary
• June 2005 issue of Psychology, Public Policy, and Law, Vol. 11, No. 2.
  • Thirty Years of Research on Race Differences in Cognitive Ability J. Philippe Rushton & Arthur R. Jensen
  • There Are No Public-Policy Implications Robert J. Sternberg
  • What if the Hereditarian Hypothesis is True? Linda S. Gottfredson
  • Heredity, Environment, and Race Differences in IQ Richard E. Nisbett
  • The Cultural Malleability of Intelligence and Its Impact on the Racial/Ethnic Hierarchy Lisa Suzuki & Joshua Aronson
  • Wanted: More Race Realism, Less Moralistic Fallacy J. Philippe Rushton & Arthur R. Jensen
• Race, Genetics and IQ Richard E. Nisbett (PDF)
• The Inequality Taboo Charles Murray archived version
• The Black-White Test Score Gap (1998) online (page-image) version of ISBN 0-8157-4609-1

Others

• Crippled by Their Culture - Race doesn't hold back America's black rednecks. Nor does racism by Thomas Sowell
• Race and IQ: Part 1, Part 2, Part 3 by Thomas Sowell
• The Skeptic's Dictionary entry on IQ and race
• (Skeptic Magazine): Two book reviews, by Paul R. Gross and Alondra Oubre, of Sarich’s and Miele’s book, Race: The Reality of Human Differences
• Criticism on source material of Bell Curve book
• Poverty and Brain Development in Early Childhood 1999 report
• Miscellaneous articles by Richard Lynn et al. Thomas Sowell (born June 30, 1930) is an American Economist, social commentator and author of dozens of books Thomas Sowell (born June 30, 1930) is an American Economist, social commentator and author of dozens of books Richard Lynn (born 1930 is a British Professor Emeritus of Psychology who is known for his controversial views on racial and
• Are IQ Tests Biased?
• Scholars Provide an Overview of Explanations for Black-White Test Score Gap
• School Readiness: Closing Racial and Ethnic Gaps
• A review of the field (Jan. 2006) Kohn, Marek, "This racist undercurrent in the tide of genetic research: As taboos fall away, there's a danger that denial of racial difference will be replaced with uncritical acceptance," The Guardian. Marek Kohn is a British science writer on Evolution, biology and society The Guardian (until 1959 The Manchester Guardian) is a British Newspaper owned by the Guardian Media Group.
• The Lessons of the Ashkenazim: Groups and Genes, Steven Pinker, June 2006, The New Republic. Steven Arthur Pinker (born September 18 1954 is a prominent Canadian - American experimental psychologist, cognitive scientist, and author The New Republic ( TNR) is an American Magazine of politics and the arts
• Are all races equally intelligent? -- Or: When is knowledge knowledge? by John J. Ray
• Black-White Gap in IQ Scores Closing, Study Finds
• Breaking Free of Nehruby Sanjeev Sabhlok : Chapter 2, section 6 of this book proposes a model of IQ determination which is strongly impacted by the level of freedom (and dignity)