Richard Lynn, Professor Emeritus, University of Ulster
Bristol, United Kingdom
|Residence||Bristol, United Kingdom|
|Alma mater||University of Cambridge|
|Known for||Race and intelligence|
Lynn was educated at Bristol Grammar School and King's College, Cambridge in England. He has worked as lecturer in psychology at the University of Exeter, and as professor of psychology at the Economic and Social Research Institute, Dublin, and at the University of Ulster at Coleraine. He has written or co-written 11 books and more than 200 journal articles spanning five decades. Two of his recent books are on dysgenics and eugenics.
In the late 1970s, Lynn wrote that he found a higher average IQ in North-East Asians compared to "Europeans" (6 points higher in his meta-analysis), and Europeans to be about 2 standard deviations (or 30 points) higher than Sub-Saharan Africans. In 1990, he proposed that the Flynn effect – an observed year-on-year rise in IQ scores around the world – could possibly be explained by improved nutrition, especially in early childhood. In two books co-written with Tatu Vanhanen he argues that differences in developmental indexes among the nations of the world correlate with, and are possibly caused by, the average IQ of their citizens. He has argued widely that the high fertility of individuals and groups of low IQ constitutes a major threat to Western civilization, as he believes they will eventually come to outnumber high IQ individuals in society. He has argued in favor of political measures to halt this predicted developmnt including anti-immigration measures and different forms of eugenics policies.
Like much of the research in race and intelligence, Lynn's research is controversial. His work is among the main sources cited in the book The Bell Curve. He was also one of the 52 scientists who signed "Mainstream Science on Intelligence", an opinion piece in the Wall Street Journal. He sits on the editorial boards of the journals Intelligence and Personality and Individual Differences, and on the boards of the Pioneer Fund, an organisation that has been described as racist in nature, and of the Pioneer-supported journal Mankind Quarterly, which has been called a white supremacist publication. A number of scientists, including Leon Kamin have criticised Lynn's work on the relations between racial and national demography and intelligence for lacking scientific rigour and for promoting a racialist political agenda. A number of studies by historian of psychology William H. Tucker and others, have described Lynn as being associated with a network of scholars and organisations working to promote scientific racism. In 2010 on his 80th birthday he was celebrated with a special issue dedicated to his work and career in Personality and Individual Differences, edited by Danish psychologist Helmuth Nyborg, with contributions by Nyborg, J. Philippe Rushton, Satoshi Kanazawa and several other psychologists.
Early life and career
Lynn is the son of the British botanist Sydney Cross Harland (1891—1982), Fellow of the Royal Society known for his work on cotton genetics. His parents divorced when he was young and he only met his father again in 1949 upon his return from Peru to become Professor of Genetics at the University of Manchester.
Lynn was educated at Bristol Grammar School and University of Cambridge in England. He has worked as lecturer in psychology at the University of Exeter, and as professor of psychology at the Economic and Social Research Institute, Dublin, and at Ulster University at Coleraine.
In 1974 Lynn published a positive review of Raymond Cattell's A New Morality from Science: Beyondism, in which he brought attention to the idea that "incompetent societies have to be allowed to go to the wall" and that "the foreign aid which we give to the under-developed world is a mistake, akin to keeping going incompetent species like the dinosaurs which are not fit for the competitive struggle for existence." In recent years, Lynn has cited the work of "Cyril Burt and Ray Cattell on the decline of genotypic intelligence arising from dysgenic fertility" as an important influence on his own thought.
Race differences in intelligence
Lynn's psychometric studies were cited in the 1994 book The Bell Curve and were criticised as part of the controversy surrounding that book. His article, "Skin color and intelligence in African Americans," 2002, Population and Environment, concludes that lightness of skin color in African-Americans is positively correlated with IQ, which he claims derives from the higher proportion of Caucasian admixture.
In IQ and the Wealth of Nations (2002), Lynn and co-author Tatu Vanhanen argue that differences in national income (in the form of per capita gross domestic product) correlate with, and can be at least partially attributed to, differences in average national IQ. One study following up on Lynn and Vanhanen's hypothesis, "Temperature, skin color, per capita income, and IQ: An international perspective", is listed as the most downloaded article in Intelligence at ScienceDirect (Jan–March 2006).
Lynn's 2006 Race Differences in Intelligence: An Evolutionary Analysis is the largest review of the global cognitive ability data. The book organises the data by nine global regions,[verification needed] surveying 620 published studies from around the world, with a total of 813,778 tested individuals.
Lynn's meta-analysis lists the average IQ scores of East Asians (105), Europeans (99), the Inuit (91), Southeast Asians and indigenous peoples of the Americas each (87), Pacific Islanders (85), Middle Easterners (including South Asians and North Africans) (84), East and West Africans (67), Australian Aborigines (62) and Bushmen and Pygmies (54).
Lynn has previously argued that nutrition is the best-supported environmental explanation for variation in the lower range, and a number of other environmental explanations have been advanced. Ashkenazi Jews average 107–115 in the US and Britain due to their better performance in verbal and reasoning tests even though they performed lower in visual and spatial ability tests, but those in Israel average lower. Lynn argues the surveyed studies have high reliability in the sense that different studies give similar results, and high validity in the sense that they correlate highly with performance in international studies of achievement in mathematics and science and with national economic development.
Following Race Differences in Intelligence, Lynn co-authored a further paper along the lines of IQ and the Wealth of Nations with Jaan Mikk (Šiauliai University, Lithuania) – in press in Intelligence – and has co-authored a second book on the subject with Vanhanen, IQ and Global Inequality, which was published later in 2006.
Another of Lynn's books is The Global Bell Curve, published in June 2008. In describing the book, Lynn says "it concludes that IQ is a key explanatory variable for the social sciences, analogous to gravity in physics." It was reviewed by J. Philippe Rushton around the time of publication.
In a paper published in 2005 about the IQ in Mexico, Richard Lynn reported that Mexicans of European descent had an IQ of 98, Mestizos in Mexicos had an IQ of 94 and indigenous peoples of Mexico had an IQ of 83, explaining the lower than expected IQ of Indians on their poor nutrition and other social factors:
Raven's Standard Progressive Matrices test was administered to a representative sample of 920 white, Mestizo and Native Mexican Indian children aged 7–10 years in Mexico. The mean IQs in relation to a British mean of 100 obtained from the 1979 British standardization sample and adjusted for the estimated subsequent increase were: 98·0 for whites, 94·3 for Mestizos and 83·3 for Native Mexican Indians.— Ethnic and Racial Differences on the Standard Progressive Matrices in Mexico
In a 2010 paper about IQ in Italy, Lynn contends that IQs are highest in the north (103 in Friuli-Venezia Giulia) and lowest in the south (89 in Sicily) and correlated with average incomes, and with stature, infant mortality, literacy and education. The lack of any actual IQ test data in this paper was criticised. According to him "the lower IQ in southern Italy may be attributable to genetic admixture with populations from the Near East and North Africa". In the same way, he thinks that this "also accounts for the IQs of around 90 for several countries in the Balkans whose populations are of partly European and partly Near Eastern origin."
Lynn's book The Chosen People: A Study of Jewish Intelligence and Achievement (2011, ISBN 978-1593680367) provides a review of the studies of intelligence in both the Ashkenazic and non-Ashkenazic Jewish populations throughout the world.
Sex differences in intelligence
Lynn's research correlating brain size and reaction time with measured intelligence led him to the problem that men and women have different-sized brains in proportion to their bodies. At that time, it was a consensus in the field of psychology that there isn't any sex differences in intelligence. In 1994, Lynn concluded in a meta-analysis that an IQ difference of roughly 4 points does appear from age 16 and onwards, but detection of this had been complicated by the faster rate of maturation of girls up to that point, which compensates for the IQ difference. This reassessment of male-female IQ has been bolstered with meta-analyses with Paul Irwing in 2004 and 2005 which found a difference of 4.6 to 5 IQ points .They saw no evidence that this is due primarily to the male advantage in spatial visualisation, and concluded that some research previously presented as showing that there are no sex differences actually demonstrates the opposite. A further study of 1,258 11-year-olds in Mauritius derived a difference of more than 6 IQ points.
Despite some criticism, their theory was supported by subsequent research at the time. However in the following years, researchers such as Timothy Z Keith, Johannes Rojahn and Alan S Kaufman found contradictory results in gender IQ differences with Keith even finding a adult female latent advantage in general factor or Kaufman finding no difference in general intelligence. Keith asserts that difference in Lynn's findings can be attributed in not using latent factors to measure their meta-analysis of sex differences. Rojahn's study found the discrepancies between the gender development were smaller than predicted by Lynn and in fact were so small that they have little or no practical importance.
Dysgenics and eugenics
Amid racialist controversies during the 90s, Lynn was quoted in the Jan 1,1995 news article Racism Resurgent saying “What is called for here is not genocide, the killing off of the population of incompetent cultures. But we do need to think realistically in terms of the ‘phasing out’ of such peoples…. Evolutionary progress means the extinction of the less competent. To think otherwise is mere sentimentality.”
In Dysgenics: Genetic Deterioration in Modern Populations, Lynn reviews  the history of eugenics, from the early writings of Bénédict Morel and Francis Galton through the rise of eugenics in the early 20th century and its subsequent collapse. He identifies three main concerns of eugenicists such as himself: deterioration in health, intelligence and conscientiousness. Lynn asserts that natural selection in pre-industrial societies favoured traits such as intelligence and character but no longer does so in modern societies. He argues that due to the advance of medicine, selection against those with poor genes for health was relaxed.
Regarding intelligence, Lynn examines sibling studies. Lynn concludes that the tendency of children with a high number of siblings to be the least intelligent is evidence of dysgenic fertility. Lynn concedes that there has been a genuine increase in phenotypic intelligence, but argues that this is caused by environmental factors and is masking a decline in genotypic intelligence.
Lynn points to evidence that those with greater educational achievement have fewer children, while children with lower IQ come from larger families  as primary evidence that intelligence and fertility are negatively correlated. Continuing the theme of correlates of fertility, socioeconomic status appears to have a negative effect on fertility, which Lynn thinks is because there is increasingly ineffective use of contraception with declining socioeconomic class. Regarding intelligence, Lynn agrees with Lewis Terman's comment in 1922 that "[t]he children of successful and cultivated parents test higher than children from wretched and ignorant homes for the simple reason that their heredity is better".
Lynn goes on to present evidence that socio-economic status is positively correlated with indicators of conscientiousness such as work ethic and moral values and negatively with crime. Next the genetic basis of differences in conscientiousness is discussed, and Lynn concludes that twin studies provide evidence of a high heritability for the trait. The less conscientious, such as criminals, have more offspring.
While most of the book discusses evidence for dysgenics in developed countries, Lynn acknowledges that it is less strong in developing countries, but concludes that "dysgenic fertility [...] is a worldwide phenomenon of modern populations" (p. 196).
Lynn concludes with an examination of counter-arguments. These include that the traits discussed are not genetically determined, that intelligence and fertility can be inversely related without dysgenics, that socio-economic classes do not differ genetically, and that there is no such thing as a 'bad gene'. These arguments are dismissed, and Lynn asserts that these trends represent a serious problem. Finally, he expresses support for eugenics, which is the subject of his next book, Eugenics: A Reassessment.
Dysgenics has been praised as "could be one of the most important books written in the last fifty years" by Glayde Whitney, a behavioral geneticist and psychology professor at Florida State University.
A review of Dysgenics by W.D. Hamilton, FRS, Royal Society Research Professor in evolutionary biology at the University of Oxford, was published posthumously in 2000. In this lengthy review, written according to the author in "rambling essay format", Hamilton writes that Lynn, "discussing the large bank of evidence that still accumulates on heritability of aptitudes and differentials of fertility, shows in this book that almost all of the worries of the early eugenicists were well-founded, in spite of the relative paucity of their evidence at the time"; in the second half of the review, several directions not covered in Lynn's book are explored.
Another review of Dysgenics was written in 2002 by N.J. Mackintosh, FRS, Emeritus Professor of Experimental Psychology in the University of Cambridge. Mackintosh writes that, "with a cavalier disregard for political correctness, he argues that the ideas of the eugenecists were correct and that we ignore them at our peril." While recognising that the book provides a valuable and accurate source of information, he criticises Lynn for "not fully acknowledg[ing] the negative relationship between social class and education on the one hand, and infant mortality and life expectancy on the other." He calls into question Lynn's interpretation of data. He also points out that according to Lynn's reading of the theory of natural selection, "if it is true that those with lower IQ and less education are producing more offspring, then they are fitter than those of higher IQ and more education"; he writes that, on the contrary, the eugenecists' arguments rest not as Lynn suggests on some "biological imperative, but rather on a particular set of value judgements."
In Eugenics: A Reassessment (2001), Lynn argues that embryo selection as a form of standard reproductive therapy would raise the average intelligence of the population by 15 IQ points in a single generation (p. 300). If couples produce a hundred embryos, he argues, the range in potential IQ would be around 15 points above and below the parents' IQ. Lynn argues this gain could be repeated each generation, eventually stabilising the population's IQ at a theoretical maximum of around 200 after as little as six or seven generations.
In the same book Lynn discusses proposals by David Lykken and others before him to introduce a license scheme for would-be parents. Lynn agrees in principle but suggests that the only practical way to make it work would be to introduce the compulsory sterilisation of every girl and boy at aged 12 – either via medical procedures which each adult would have to apply to get removed or via a virus that would cause sterility for a set period of time.
Eugenics received praise in a review by behavioural geneticist and Pioneer grantee, David T. Lykken as "[an] excellent, scholarly book ...one cannot reasonably disagree with him on any point unless one can find an argument he has not already refuted."
Lynn currently serves on the board of directors of the Pioneer Fund, and is also on the editorial board of the Pioneer-supported journal Mankind Quarterly, both of which have been the subject of controversy for their dealing with race and intelligence and eugenics, and have been accused of racism, e.g., by Avner Falk and William H. Tucker. Lynn's Ulster Institute for Social Research received $609,000 in grants from the Pioneer Fund between 1971 and 1996.
Lynn's 2001 book The Science of Human Diversity: A History of the Pioneer Fund is a history and defence of the fund, in which he argues that, for the last sixty years, it has been "nearly the only non-profit foundation making grants for study and research into individual and group differences and the hereditary basis of human nature ... Over those 60 years, the research funded by Pioneer has helped change the face of social science."
Lynn's review work on global racial differences in cognitive ability has been cited for misrepresenting the research of other scientists, and has been criticised for unsystematic methodology and distortion.
David King， the coordinator of the watchdog group Human Genetics Alert, said "we find Richard Lynn's claims that some human beings are inherently superior to others repugnant."
Many of the data points in Lynn's book IQ and the Wealth of Nations were not based on residents of the named countries. The datum for Suriname was based on tests given to Surinamese who had emigrated to the Netherlands, and the datum for Ethiopia was based on the IQ scores of a highly selected group that had emigrated to Israel, and, for cultural and historical reasons, was hardly representative of the Ethiopian population. The datum for Mexico was based on a weighted averaging of the results of a study of "Native American and Mestizo children in Southern Mexico" with results of a study of residents of Argentina.
The datum that Lynn and Vanhanen used for the lowest IQ estimate, Equatorial Guinea, was taken from a group of children in a home for the developmentally disabled in Spain. Corrections were applied to adjust for differences in IQ cohorts (the "Flynn" effect) on the assumption that the same correction could be applied internationally, without regard to the cultural or economic development level of the country involved. While there appears to be rather little evidence on cohort effect upon IQ across the developing countries, one study in Kenya (Daley, Whaley, Sigman, Espinosa, & Neumann, 2003) shows a substantially larger cohort effect than is reported for developed countries (p.?)
In a critical review of The Bell Curve, psychologist Leon Kamin faulted Lynn for disregarding scientific objectivity, misrepresenting data, and for racism. Kamin argues that the studies of cognitive ability of Africans in Lynn's meta-analysis cited by Richard Herrnstein and Charles Murray show strong cultural bias. Kamin also reproached Lynn for concocting IQ values from test scores that have no correlation to IQ. Kamin also notes that Lynn excluded a study that found no difference in White and Black performance, and ignored the results of a study which showed Black scores were higher than White scores.
Journalist Charles Lane criticised Lynn's methodology in his article in the The New York Review of Books, "The Tainted Sources of The Bell Curve" (1994). Pioneer Fund president Harry F. Weyher Jr. published a response accusing the reviewer of errors and misrepresentation; Lane also replied to this with a rebuttal.
- Lynn, Richard (2001). Eugenics: A reassessment. Praeger Publishers. ISBN 9780275958220.
- Lynn, Richard; Vanhanen, Tatu (2002). IQ and the wealth of nations. Westport, Connecticut: Praeger. ISBN 9780275975104.
- Lynn, Richard (2011) . Dysgenics: Genetic deterioration in modern populations. Praeger Publishers. ISBN 9780275949174.
- Lynn, Richard; Vanhanen, Tatu (2012). Intelligence: A unifying construct for the social sciences. Ulster: Ulster Institute for Social Research. ISBN 9780956881175.
- Psychology Research Institute
- Richard Lynn
- Call for re-think on eugenics BBCNews Friday, 26 April 2002
- Gottfredson, Linda (13 December 1994). Mainstream Science on Intelligence. p A18.
- Intelligence and Personality and Individual Differences publisher's pages.
- William H. Tucker, The funding of scientific racism: Wickliffe Draper and the Pioneer Fund, University of Illinois Press, 2002. Page 214
- Joe L. Kincheloe, Measured Lies: The Bell Curve Examined, Palgrave Macmillan, 1997, pg. 39
- William H. Tucker, The funding of scientific racism: Wickliffe Draper and the Pioneer Fund, University of Illinois Press, 2002, pg. 2
- Velden, Manfred (2010). Biologism-: The Consequence of an Illusion. V&R unipress GmbH. p. 118.
- Wilson, Carter A. (1996). Racism: From Slavery to Advanced Capitalism. SAGE. p. 229.
At best Lynn's approach is racial propaganda or biased research driven by a strong prejudice against blacks and a strong need to believe in their genetic inferiority. At worst, Lynn's research arises out of a malicious and dishonest effort to demonstrate the genetic inferiority of blacks
- Kamin, Leon. "Behind the Bell Curve" (PDF). Scientific American: 100.
Lynn's distortions and misrepresentations of the data constitute a truly venomous racism, combined with the scandalous disregard for scientific objectivity
- Barnett, Susan M.; Williams, Wendy (2004). "National Intelligence and The Emperor's New Clothes.". PsycCRITIQUES. 49 (4): 389–396. doi:10.1037/004367.
Among this book's strengths are that it argues for a point of view unpopular within the scientific community, it relies on hard data to make its points, its organization and clarity. Also, the book is expansive in its thinking and argumentation. All of these strengths considered, however, we believe that the arguments advanced in the book are flawed by an omnipresent logical fallacy and confusion of correlation with causation that undermines the foundation of the book.
- Valencia, Richard R. (2010). Dismantling Contemporary Deficit Thinking: Educational Thought and Practice. Routledge. pp. 56=61.
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- Sussman, Robert Wald (2014). The Myth of Race: The Troubling Persistence of an Unscientific Idea. Harvard University Press.
- Evolution of race and sex differences in intelligence and personality: Tribute to Richard Lynn at eighty. Personality and Individual Differences. Volume 53, Issue 2, July 2012. Helmuth Nyborg (ed.)
- Nyborg, Helmuth (2011). "A conversation with Richard Lynn" (PDF). Personality and individual differences. 53: 79–84. doi:10.1016/j.paid.2011.02.033.
- Lynn, Richard (Winter 1974). "Review: A New Morality from Science: Beyondism.". Irish Journal of Psychology. 2 (#3).
- Kurtagic, Alex. "Interview with Richard Lynn". Retrieved 22 October 2013.
- Richard Lynn, reply by Charles Lane (2 February 1995) ‘The Bell Curve’ and Its Sources The New York Review of Books. Retrieved 10 January 2014
- "Publications". Rlynn.co.uk. Retrieved 21 August 2010.
- Praeger; ISBN 0-275-97510-X
- Hunt, Earl; Sternberg, Robert J. (28 November 2005). "Sorry, wrong numbers: An analysis of a study of a correlation between skin color and IQ". Intelligence. 34 (2): 131–137. doi:10.1016/j.intell.2005.04.004.
- Templer, Donald I.; Arikawa, Hiroko (2006). "Temperature, skin color, per capita income, and IQ: An international perspective". Intelligence. 34 (2): 121–139. doi:10.1016/j.intell.2005.04.002.
- "ScienceDirect TOP25 Hottest Articles". Psychology > Intelligence. Top25.sciencedirect.com. 2006. Retrieved 21 August 2010.
- Washington Summit Books; ISBN 1-59368-020-1
- Herrnstein and Murray 1994; Lynn 1991a; Lynn 2006
- Rushton, J. P. (2006). "Lynn Richard, Race Differences in Intelligence: An Evolutionary Analysis, Washington Summit Books, Augusta, Georgia (2005) ISBN 1-59368-020-1, 318 pages., US$34.95". Personality and Individual Differences. 40 (4): 853–855. doi:10.1016/j.paid.2005.10.004.
- Lynn, R. and Vanhanen, T. (2002). IQ and the wealth of nations. Westport, Connecticut: Praeger. ISBN 0-275-97510-X
- In RDiI Lynn surveys NGO reports of four different signs of severe malnutrition – underweight, anemia, wasting, and stunting – for five developing regions, ranking Latin America as suffering the least malnutrition, followed by the Middle-east, Asia/Pacific, Africa, and finally South Asia, suffering the worst malnutrition of any region (ch. 14).
- Lynn's data is somewhat weak on Ashkenazi Jews (Malloy 2006), and only allows an indirect, weighted estimate in Israel (103), compared with (similarly indirect) estimates of 91 for Israeli Oriental Jews, and 86 for Israeli Arabs. Israeli Ashkenazi's scores may average lower than U.S. and British Ashkenazi, Lynn suggests, due to selective migration effects in relation to those countries, and to immigrants from the former Soviet Block countries having posed as Ashkenazim. The data isn't necessarily strong enough, however, to rule out identical scores for Ashkenazi across these nations (Malloy 2006).
- Lynn, Richard; Mikk, Jaan (2007). "National differences in intelligence and educational attainment". Intelligence. 35 (2): 115–121. doi:10.1016/j.intell.2006.06.001.
- Discussed in Lynn and Mikk 2006. See review: Rushton (2006). Personality and Individual Differences. 41 (5): 983–985. doi:10.1016/j.paid.2006.05.007. Missing or empty
- Lynn, R. (2008). The Global Bell Curve: Race, IQ, and Inequality Worldwide. Augusta, Georgia: Washington Summit Publishers. pp. 378 pp. ISBN 1-59368-028-7.
- Lynn, R. "Publications". Retrieved 27 July 2008.
- Rushton, J. P. (July 2008). "The Global Bell Curve: Race, IQ and Inequality Worldwide (Book review)". Personality and Individual Differences. 45 (1): 113–114. doi:10.1016/j.paid.2008.03.008.
Lynn shows in detail that similar racial IQ/socio-economic hierarchies are present within Africa, Australia, Brazil, Britain, Canada, the Caribbean, Latin America, the Netherlands, and New Zealand.
- Lynn, R. Backhoff, E. Contreras, L. (2005). "Ethnic and Racial Differences on the Standard Progressive Matrices in Mexico". Journal of Biosocial Science. Cambridge: University of Cambridge. 37: 107–113. doi:10.1017/s0021932003006497.
- Lynn, R (2010). "In Italy, north–south differences in IQ predict differences in income, education, infant mortality, stature, and literacy". Intelligence. 38 (1): 93–100. doi:10.1016/j.intell.2009.07.004.
- Cornoldi, Cesare; Belacchi, Carmen; Giofrè, David; Martini, Angela; Tressoldi, Patrizio (2010). "The mean Southern Italian children IQ is not particularly low: A reply to R. Lynn (2010), Intelligence". Intelligence. 38 (5): 462–470. doi:10.1016/j.intell.2010.06.003.
- Nyborg, Helmuth (July 2012). "A conversation with Richard Lynn". Personality and Individual Differences. 53 (2): 79–84. doi:10.1016/j.paid.2011.02.033.
- Lynn, Richard; Irwing, Paul (2004). "Sex differences on the progressive matrices: A meta-analysis" (PDF). Intelligence. 32 (5): 481–498. doi:10.1016/j.intell.2004.06.008.
- Irwing, P.; Lynn, R. (2005). "Sex differences in means and variability on the progressive matrices in university students: A meta-analysis". British Journal of Psychology. 96 (Pt 4): 505–524. PMID 16248939. doi:10.1348/000712605X53542.
- Lynn, Richard; Raine, Adrian; Venables, Peter H.; Mednick, Sarnoff A.; Irwing, Paul (2005). "Sex differences on the WISC-R in Mauritius". Intelligence. 33 (5): 527–533. doi:10.1016/j.intell.2005.05.001.
- McKie, Robin (6 November 2005). "Who has the bigger brain?". The Guardian.
- Nyborg, Helmuth (August 2005). "Sex-related differences in general intelligence g, brain size, and social status". Personality and Individual Differences. 39 (3): 497–509. doi:10.1016/j.paid.2004.12.011.
- Meisenberg, Gerhard (Fall 2015). "Intellectual Growth during Late Adolescence: Effects of Sex and Race" (PDF). 56 (1): 138–155. Retrieved 10 December 2015.
- Jackson, Douglas N.; Rushton, J. Philippe (September 2006). "Males have greater g: Sex differences in general mental ability from 100,000 17- to 18-year-olds on the Scholastic Assessment Test". Intelligence. 34 (5): 479–486. doi:10.1016/j.intell.2006.03.005.
- Colom, Roberto; Lynn, Richard (January 2004). "Testing the developmental theory of sex differences in intelligence on 12–18 year olds". Personality and Individual Differences. 36 (1): 75–82. doi:10.1016/S0191-8869(03)00053-9.
- Keith, Timothy Z.; Reynolds, Matthew R.; Patel, Puja G.; Ridley, Kristen P. "Sex differences in latent cognitive abilities ages 6 to 59: Evidence from the Woodcock–Johnson III tests of cognitive abilities". Intelligence. 36 (6): 502–525. doi:10.1016/j.intell.2007.11.001.
- Rojahn, Johannes; Naglieri, Jack A. (2006-05-01). "Developmental gender differences on the Naglieri Nonverbal Ability Test in a nationally normed sample of 5–17 year olds". Intelligence. 34 (3): 253–260. doi:10.1016/j.intell.2005.09.004.
- Kaufman, A. S.; Kaufman, J. C.; Liu, X.; Johnson, C. K. "How do Educational Attainment and Gender Relate to Fluid Intelligence, Crystallized Intelligence, and Academic Skills at Ages 22-90 Years?". Archives of Clinical Neuropsychology. 24 (2): 153–163. doi:10.1093/arclin/acp015.
- Camarata, Stephen; Woodcock, Richard. "Sex differences in processing speed: Developmental effects in males and females". Intelligence. 34 (3): 231–252. doi:10.1016/j.intell.2005.12.001.
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- Chapter 14
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- Wicherts, J. M.; Dolan, C. V.; van der Maas, H. L. J. (2010). "A systematic literature review of the average IQ of sub-Saharan Africans" (PDF). Intelligence. 38 (1): 1–20. doi:10.1016/j.intell.2009.05.002. Retrieved 8 September 2014.
- Kamin, Leon (February 1995). "The Bell Curve: Intelligence and Class Structure in American Life". Scientific American. 272.
Lynn's distortions and misrepresentations of the data constitute a truly venomous racism, combined with scandalous disregard for scientific objectivity. Lynn is widely known among academics to be an associate editor of the racist journal "Mankind Quarterly" and a major recipient of financial support from the nativist, eugenically oriented Pioneer Fund.
- Kamin, Leon (February 1995). "The Bell Curve: Intelligence and Class Structure in American Life". Scientific American. 272.
In 1992 Owen reported on a sample of coloured students that had been added to the groups he had tested earlier. The footnote in "The Bell Curve" seems to credit this report as proving that South African colored students have an IQ "similar to that of American blacks," that is, about 85 (the actual reference does not appear in the book's bibliography). That statement does not correctly characterize Owen's work. The test used by Owen in 1992 was the "nonverbal" Raven's Progressive Matrices, which is thought to be less culturally biased than other IQ tests. He was able to compare the performance of colored students with that of the whites, blacks and Indians in his 1989 study because the earlier set of pupils had taken the Progressive Matrices in addition to the Junior Aptitude Tests. The black pupils, recall, had poor knowledge of English, but Owen felt that the instructions for the Matrices "are so easy that they can be explained with gestures." Owen's 1992 paper again does not assign IQs to the pupils. Rather he gives the mean number of correct responses on the Progressive Matrices (out of a possible 60) for each group: 45 for whites, 42 for Indians, 37 for coloreds and 28 for blacks. The test's developer, John Raven, repeatedly insisted that results on the Progressive Matrices tests cannot be converted into IQs. Matrices scores, unlike IQs, are not symmetrical around their mean (no "bell curve" here). There is thus no meaningful way to convert an average of raw Matrices scores into an IQ, and no comparison with American black IQs is possible.
- Kamin, Leon (February 1995). "The Bell Curve: Intelligence and Class Structure in American Life". Scientific American. 272. Archived from the original on 22 October 2007.
Lynn chose to ignore the substance of Crawford-Nutt's paper, which reported that 228 black high school students in Soweto scored an average of 45 correct responses on the Matrices—HIGHER than the mean of 44 achieved by the same-age white sample on whom the test's norms had been established and well above the mean of Owen's coloured pupils.
- More by Charles Lane. "The Tainted Sources of 'The Bell Curve' | The New York Review of Books". Nybooks.com. Retrieved 21 August 2010.
- More by Charles Lane, Harry F. Weyher. "'The Bell Curve' and Its Sources | The New York Review of Books". Nybooks.com. Retrieved 21 August 2010.
- Race and Psychopathic Personality: Racial differences in "average personality." by Richard Lynn, 2002, American Renaissance
- Psychopathic personality and racial/ethnic differences reconsidered: a reply to Lynn (2002) Jennifer L. Skeem, John F. Edens, Glenn M. Sanford, Lori H. Colwell, Personality and Individual Differences 35 (2003) 1439–1462 doi:10.1016/S0191-8869(02)00361-6
- Cavalli-Sforza, L. L., Menozzi, P., & Piazza, A. (1994). The history and geography of human genes. Princeton, New Jersey: Princeton University Press.
- Flynn, J. (1982). "Lynn, the Japanese, and environmentalism". Bulletin of the British Psychological Society. 35: 411.
- Flynn, J (1984). "The mean IQ of Americans: massive gains 1932 to 1978". Psychological Bulletin. 95: 29–51. doi:10.1037/0033-2909.95.1.29.
- Flynn, J (1987). "Massive gains in 14 nations: what IQ tests really measure". Psychological Bulletin. 101 (2): 171–91. doi:10.1037/0033-2909.101.2.171.
- Lykken, D (2004). "The New Eugenics". Contemporary Psychology. 49: 670–672.
- Lynn, Richard (1978). "Ethnic and Racial Differences in Intelligence, International Comparisons". Human variation: The biopsychology of age, race, and sex. Academic Press. ISBN 0-12-529050-0.
- Lynn, Richard (1982). "IQ in Japan and the United States shows a growing disparity". Nature. 297 (5863): 222–3. doi:10.1038/297222a0.
- Lynn, Richard (1990). "The role of nutrition in secular increases of intelligence". Personality and Individual Differences. 11 (3): 273–285. doi:10.1016/0191-8869(90)90241-i.
- Lynn, Richard (1996). Dysgenics: Genetic Deterioration in Modern Populations. Praeger Publishers. ISBN 0-275-94917-6.
- Lynn, Richard (2001). Eugenics: A Reassessment. Praeger Publishers. ISBN 0-275-95822-1.
- Lynn, Richard. (2010). In Italy, north–south differences in IQ predict differences in income, education, infant mortality, stature, and literacy. Intelligence, Volume 38, Issue 1, January–February 2010, Pages 93–100
Malloy, J. (2006). "A World of Difference: Richard Lynn Maps World Intelligence". Gene Expression. Retrieved 22 February 2006.
- Martin, N (2001). "Retrieving the 'eu' from eugenics". Nature. 414 (6864): 583. doi:10.1038/414583a.
- Neisser, U. (1997). Rising Scores on Intelligence Tests. American Scientist, Sept.-Oct