View source for The Bell Curve

{{Short description|1994 book}}
{{About||the principal, mathematical meaning of the term "bell curve"|Normal distribution|other senses of the term|Bell curve (disambiguation)}}
{{Infobox book
|name = The Bell Curve
|image  = TheBellCurve.gif
|caption = Cover of the first edition
|authors = [[Richard Herrnstein|Richard J. Herrnstein]]<br/>[[Charles Murray (political scientist)|Charles Murray]]
|cover_artist =
|subject = [[Intelligence]]<br>[[Social class]]
|publisher = [[Free Press (publisher)|Free Press]]
|pub_date = 1994
|media_type = Print ([[hardcover]] and [[paperback]])
|pages = 845
|isbn = 0-02-914673-9
|dewey= 305.9/082 20
|congress= BF431 .H398 1994
|oclc= 30913157
}}
'''''The Bell Curve: Intelligence and Class Structure in American Life''''' is a 1994 book by the psychologist [[Richard Herrnstein|Richard J. Herrnstein]] and the political scientist [[Charles Murray (political scientist)|Charles Murray]] in which the authors argue that [[human intelligence]] is substantially influenced by both inherited and environmental factors and that it is a better predictor of many personal outcomes, including financial income, job performance, birth out of [[marriage|wedlock]], and involvement in crime, than is an individual's parental [[socioeconomic status]]. They also argue that those with high intelligence, the "cognitive elite", are becoming separated from those of average and below-average intelligence, and that this separation is a source of social division within the United States.

The book has been, and remains, highly controversial, especially where the authors discussed purported connections between [[race and intelligence]] and suggested policy implications based on these purported connections. The authors claimed that average [[intelligence quotient]] (IQ) differences between racial and ethnic groups are at least partly genetic in origin, a view that is now considered discredited by mainstream science.<ref>{{Cite journal |last1=Bird |first1=Kevin |last2=Jackson |first2=John P. |last3=Winston |first3=Andrew S. |date=2024 |title=Confronting Scientific Racism in Psychology: Lessons from Evolutionary Biology and Genetics |url=https://psycnet.apa.org/doiLanding?doi=10.1037%2Famp0001228 |journal=American Psychologist |volume=79 |issue=4 |pages=497–508 |doi=10.1037/amp0001228 |pmid=39037836 |quote=Recent articles claim that the folk categories of race are genetically meaningful divisions, and that evolved genetic differences among races and nations are important for explaining immutable differences in cognitive ability, educational attainment, crime, sexual behavior, and wealth; all claims that are opposed by a strong scientific consensus to the contrary. ... Despite the veneer of modern science, RHR [racial hereditarian research] psychologists’ recent efforts merely repeat discredited racist ideas of a century ago. The issue is truly one of scientific standards; if psychology embraced the scientific practices of evolutionary biology and genetics, current forms of RHR would not be publishable in reputable scholarly journals.}}</ref><ref name="VoxConsensus">{{cite web |last1=Turkheimer |first1=Eric |last2=Harden |first2=Kathryn Paige |last3=Nisbett |first3=Richard E. |date=June 15, 2017 |title=There's still no good reason to believe black-white IQ differences are due to genes |url=https://www.vox.com/the-big-idea/2017/6/15/15797120/race-black-white-iq-response-critics |url-status=live |archive-url=https://web.archive.org/web/20210504055356/https://www.vox.com/the-big-idea/2017/6/15/15797120/race-black-white-iq-response-critics |archive-date=May 4, 2021 |access-date=29 April 2021 |website=Vox |publisher=Vox Media}}</ref><ref name=":3">{{Cite journal |last1=Panofsky |first1=Aaron |last2=Dasgupta |first2=Kushan |last3=Iturriaga |first3=Nicole |year=2021 |title=How White nationalists mobilize genetics: From genetic ancestry and human biodiversity to counterscience and metapolitics |journal=American Journal of Physical Anthropology |volume=175 |issue=2 |pages=387–398 |doi=10.1002/ajpa.24150 |pmc=9909835 |pmid=32986847 |bibcode=2021AJPA..175..387P |s2cid=222163480 |quote=}}</ref> Many of the references and sources used in the book were advocates for [[racial hygiene]], whose research was funded by the [[white supremacist]] organization [[Pioneer Fund]] and published in its affiliated journal ''[[Mankind Quarterly]]''.<ref>{{Cite journal |last=Paul |first=Dianne B. |date=2003 |title=The Funding of Scientific Racism: Wickliffe Draper and the Pioneer Fund (review) |url=https://muse.jhu.edu/article/49445 |journal=Bulletin of the History of Medicine |volume=77 |issue=4 |pages=972–974 |doi=10.1353/bhm.2003.0186 |quote=Media attention peaked in the aftermath of the publication of Richard Herrnstein and Charles Murray's The Bell Curve (1994), which drew heavily on fund-supported research by Arthur Jensen, Richard Lynn, and J. Philippe Rushton (who was appointed president of the Fund in March 2002). Critics have charged that, from its inception, Pioneer pursued a racist/eugenicist agenda, and they view its more recent support of work in behavioral genetics as a continuation of this aim.|url-access=subscription }}</ref><ref>{{Cite news |last=Lane |first=Charles |date=1 December 1994 |title=The Tainted Sources of 'The Bell Curve' |url=https://www.nybooks.com/articles/1994/12/01/the-tainted-sources-of-the-bell-curve/ |archive-url= |work=The New York Review of Books |quote=Charles Murray recently expressed his own sense of queasiness about the book’s sources to a reporter from The New York Times: 'Here was a case of stumbling onto a subject that had all the allure of the forbidden,' he said. 'Some of the things we read to do this work, we literally hide when we’re on planes and trains. We’re furtively peering at this stuff.' What sort of 'stuff' could Murray mean? Surely the most curious of the sources he and Herrnstein consulted is Mankind Quarterly—a journal of anthropology founded in Edinburgh in 1960. Five articles from the journal are actually cited in The Bell Curve’s bibliography (pp. 775, 807, and 828). But the influence on the book of scholars linked to Mankind Quarterly is more significant. No fewer than seventeen researchers cited in the bibliography of The Bell Curve have contributed to Mankind Quarterly. Ten are present or former editors, or members of its editorial advisory board. This is interesting because Mankind Quarterly is a notorious journal of “racial history” founded, and funded, by men who believe in the genetic superiority of the white race.}}</ref> Because of this, some critics have dismissed the book and its purported findings as [[pseudoscience]].{{sfn|Graves|Johnson|1995}}<ref name=":4" />

Shortly after its publication, many people rallied both in criticism and in defense of the book. A number of critical texts were written in response to it. Several criticisms were collected in the book ''[[The Bell Curve Debate]]''.

==Synopsis==
{{One source|section|date=December 2019}}

''The Bell Curve'', published in 1994, was written by Richard Herrnstein and Charles Murray to explain the variations in intelligence in American society, warn of some consequences of that variation, and propose social policies for mitigating the worst of the consequences.<ref name="Dickens1995">{{Citation |last=Dickens |first=William T. |last2=Schultze |first2=Charles L. |last3=Kane |first3=Thomas J. |title=Does The Bell Curve Ring True? A Closer Look at a Grim Portrait of American Society |url=https://www.brookings.edu/articles/does-the-bell-curve-ring-true-a-closer-look-at-a-grim-portrait-of-american-society/ |publisher=Brookings Institution |date=1995-06-01}}</ref> The book's title refers to the bell-shaped [[normal distribution]] of [[intelligence quotient|IQ]] scores observed in large populations.<ref name="Haier2017">{{Citation |editor-last=Haier |editor-first=Richard J. |title=The Neuroscience of Intelligence |publisher=Cambridge University Press |year=2017 |page=15 |isbn=9781108718882}}</ref>

===Introduction===

The book starts with an introduction that appraises the history of the concept of intelligence from [[Francis Galton]] to modern times. Spearman's introduction of the [[g factor (psychometrics)|general factor of intelligence]] and other early advances in research on intelligence are discussed along with a consideration of links between intelligence testing and racial politics. The 1960s are identified as the period in American history when social problems were increasingly attributed to forces outside the individual. This egalitarian ethos, Herrnstein and Murray argue, cannot accommodate biologically based individual differences.<ref name="devlin">{{cite book |title=Intelligence, Genes, and Success: Scientists Respond to The Bell Curve |url=https://archive.org/details/intelligencegene00bern |url-access=registration |first1=Bernie |last1=Devlin |first2=Stephen E. |last2=Fienberg |first3=Daniel P. |last3=Resnick |first4=Kathryn |last4=Roeder |author4-link=Kathryn Roeder |publisher=Springer Science & Business Media |year=1997 |isbn=978-0-387-94986-4}}</ref>

The introduction states six of the authors' assumptions, which they claim to be "beyond significant technical dispute":<ref name="HerrnsteinMurray2010">{{cite book |first1=Richard J. |last1=Herrnstein |first2=Charles |last2=Murray |title=The Bell Curve: Intelligence and Class Structure in American Life |url=https://books.google.com/books?id=s4CKqxi6yWIC |date=11 May 2010 |publisher=Simon and Schuster |isbn=978-1-4391-3491-7 |pages=22–23}}</ref>
# There is such a difference as a general factor of cognitive ability on which human beings differ.
# All standardized tests of academic aptitude or achievement measure this general factor to some degree, but IQ tests expressly designed for that purpose measure it most accurately.
# IQ scores match, to a first degree, whatever it is that people mean when they use the word intelligent, or smart in ordinary language.
# IQ scores are stable, although not perfectly so, over much of a person's life.
# Properly administered IQ tests are not demonstrably biased against social, economic, ethnic, or racial groups.
# Cognitive ability is substantially [[Heritability|heritable]], apparently no less than 40 percent and no more than 80 percent.
At the close of the introduction, the authors warn the reader against committing the [[ecological fallacy]] of inferring things about individuals based on the aggregate data presented in the book. They also assert that intelligence is just one of many valuable human attributes and one whose importance among human virtues is overrated.<ref name="devlin"/>

===Part I. The Emergence of a Cognitive Elite===

In the first part of the book Herrnstein and Murray chart how American society was transformed in the 20th century. They argue that America evolved from a society where social origin largely determined one's social status to one where cognitive ability is the leading determinant of status. The growth in college attendance, a more efficient recruitment of cognitive ability, and the sorting of cognitive ability by selective colleges are identified as important drivers of this evolution. Herrnstein and Murray propose that the cognitive elite has been produced by a more technological society which offers enough high skill jobs for those with a higher intelligence to fill. They also propose that by removing [[race (classification of human beings)|race]], [[gender]] or [[social class|class]] as criteria (via the establishment of free primary education and the prohibition of discrimination) the main criterion of success in academic and professional life is cognitive ability. Increased occupational sorting by cognitive ability is discussed. They maintain that cognitive ability is the best predictor of worker productivity.<ref name="devlin"/>

Herrnstein and Murray argue that due to increasing returns to cognitive ability, a cognitive elite is being formed in America. They argue that this elite is getting richer and progressively more segregated from the rest of society.<ref name="devlin"/>

===Part II. Cognitive Classes and Social Behavior===

The second part describes how cognitive ability is related to social behaviors: high ability predicts socially desirable behavior, low ability undesirable behavior. The argument is made that group differences in social outcomes are better explained by intelligence differences rather than socioeconomic status, a perspective, the authors argue, that has been neglected in research.<ref name="devlin"/>

The analyses reported in this part of the book were done using data from the [[National Longitudinal Surveys|National Longitudinal Survey of Labor Market Experience of Youth]] (NLSY), a study conducted by the [[United States Department of Labor]]'s [[Bureau of Labor Statistics]] tracking thousands of Americans starting in the 1980s. Only [[non-Hispanic white]]s are included in the analyses so as to demonstrate that the relationships between cognitive ability and social behavior are not driven by race or ethnicity.<ref name="devlin"/>

Herrnstein and Murray argue that intelligence is a better predictor of individuals' outcomes than parental socioeconomic status. This argument is based on analyses where individuals' IQ scores are shown to better predict their outcomes as adults than the socioeconomic status of their parents. Such results are reported for many outcomes, including poverty, dropping out of school, unemployment, marriage, divorce, illegitimacy, welfare dependency, criminal offending, and the probability of voting in elections.<ref name="devlin"/>

All participants in the NLSY took the [[Armed Services Vocational Aptitude Battery]] (ASVAB), a battery of ten tests taken by all who apply for entry into the armed services. (Some had taken an IQ test in high school, and the median correlation of the [[Armed Services Vocational Aptitude Battery#Armed Forces Qualification Test|Armed Forces Qualification Test (AFQT)]] scores and those IQ test scores was .81). Participants were later evaluated for social and economic outcomes. In general, Herrnstein and Murray argued, IQ/AFQT scores were a better predictor of life outcomes than [[social class]] background. Similarly, after statistically controlling for differences in IQ, they argued that many outcome differences between racial-ethnic groups disappeared.

{| class="wikitable"
|+ Economic and social correlates of IQ
! IQ || <75 || 75–90 || 90–110 || 110–125 || >125
|-
| US population distribution || 5 || 20 || 50 || 20 || 5
|-
| Married by age 30 || 72 || 81 || 81 || 72 || 67
|-
| Out of labor force more than 1 month out of year (men) || 22 || 19 || 15 || 14 || 10
|-
| Unemployed more than 1 month out of year (men) || 12 || 10 || 7 || 7 || 2
|-
| Divorced in 5 years || 21 || 22 || 23 || 15 || 9
|-
| % of children w/ IQ in bottom decile (mothers) || 39 || 17 || 6 || 7 || –
|-
| Had an [[Illegitimacy|illegitimate]] baby (mothers) || 32 || 17 || 8 || 4 || 2
|-
| Lives in poverty || 30 || 16 || 6 || 3 || 2
|-
| Ever [[incarcerated]] (men) || 7 || 7 || 3 || 1 || 0
|-
| Chronic welfare recipient (mothers) || 31 || 17 || 8 || 2 || 0
|-
| High school dropout || 55 || 35 || 6 || 0.4 || 0
|-
|Scored "Yes" on "Middle Class Values Index"{{refn|group=c|According to Herrnstein & Murray the "Middle Class Values Index" was intended "to identify among the NLSY population, in their young adulthood when the index was scored, those people who are getting along with their lives in ways that fit the middle-class stereotype." To score "Yes" on the index, a NLSY subject had to meet all four of the following criteria:
* Received at least a high-school diploma
* Never interviewed while incarcerated
* Still married to one's first spouse
* ''Men only:'' In the labor force, even if not employed
* ''Women only:'' Never gave birth outside of marriage
Excluded from the analysis were never-married individuals who satisfied all other components of the index, and men who were not in the labor force in 1989 or 1990 due to disability or still being in school.<ref>Herrnstein & Murray (1994) pp. 263–264</ref>}} || 16 || 30 || 50 || 67 || 74
|}
Values are the percentage of each IQ sub-population, among non-Hispanic whites only, fitting each descriptor.<ref>Herrnstein & Murray (1994) pp.&nbsp;171, 158, 163, 174, 230, 180, 132, 194, 247–248, 194, 146, 264 respectively.</ref>

{{reflist|group=c}}

===Part III. The National Context===

This part of the book discusses ethnic differences in cognitive ability and social behavior. Herrnstein and Murray report that Asian Americans have a higher mean IQ than white Americans, who in turn outscore black Americans. The book argues that the black–white gap is not due to test bias, noting that IQ tests do not tend to underpredict the school or job performance of black individuals and that the gap is larger on apparently culturally neutral test items than on more culturally loaded items. The authors also note that adjusting for socioeconomic status does not eliminate the black–white IQ gap. However, they argue that the gap is narrowing.<ref name="devlin"/>

According to Herrnstein and Murray, the high [[heritability of IQ]] within races does not necessarily mean that the cause of differences between races is genetic. On the other hand, they discuss lines of evidence that have been used to support the thesis that the black–white gap is at least partly genetic, such as [[Spearman's hypothesis]]. They also discuss possible environmental explanations of the gap, such as the observed generational increases in IQ, for which they coin the term [[Flynn effect]]. At the close of this discussion, they write:<ref name="devlin"/>

{{blockquote|If the reader is now convinced that either the genetic or environmental explanation has won out to the exclusion of the other, we have not done a sufficiently good job of presenting one side or the other. It seems highly likely to us that both genes and environment have something to do with racial differences. What might the mix be? We are resolutely agnostic on that issue; as far as we can determine, the evidence does not yet justify an estimate.}}

The authors also stress that regardless of the causes of differences, people should be treated no differently.<ref name="devlin"/>

In Part III, the authors also repeat many of the analyses from Part II, but now compare whites to blacks and Hispanics in the NLSY dataset. They find that after controlling for IQ, many differences in social outcomes between races are diminished.<ref name="devlin"/>

The authors discuss the possibility that high birth rates among those with lower IQs may exert a downward pressure on the national distribution of cognitive ability. They argue that immigration may also have a similar effect.<ref name="devlin"/>

At the close of Part III, Herrnstein and Murray discuss the relation of IQ to social problems. Using the NLSY data, they argue that social problems are a monotonically decreasing function of IQ,<ref name="devlin"/> in other words at lower IQ scores the frequency of social problems increases.

===Living Together===

In this final chapter, the authors discuss the relevance of cognitive ability for understanding major social issues in America.<ref name="devlin"/>

Evidence for experimental attempts to raise intelligence is reviewed. The authors conclude that currently there are no means to boost intelligence by more than a modest degree.<ref name="devlin"/>

The authors criticize the "levelling" of general and secondary education and defend [[gifted education]]. They offer a critical overview of [[affirmative action]] policies in colleges and workplaces, arguing that their goal should be equality of opportunity rather than equal outcomes.<ref name="devlin"/>

Herrnstein and Murray offer a pessimistic portrait of America's future. They predict that a cognitive elite will further isolate itself from the rest of society, while the quality of life deteriorates for those at the bottom of the cognitive scale. As an antidote to this prognosis, they offer a vision of society where differences in ability are recognized and everybody can have a valued place, stressing the role of local communities and clear moral rules that apply to everybody.<ref name="devlin"/>

===Policy recommendations===
Herrnstein and Murray argued that the average genetic IQ of the United States is declining, owing to differential fertility patterns such as higher-IQ individuals having fewer children, shorter generation length among lower-IQ individuals, and immigration skewed toward groups with lower measured intelligence.<ref name="tucker2023">{{Citation |last=Tucker |first=William H. |chapter=Meritocracy: Places, Everyone! |title='''The Bell Curve''' in Perspective |publisher=Springer |series=Palgrave Studies in the Theory and History of Psychology |year=2023 |pages=127–128 |doi=10.1007/978-3-031-41614-9_2|doi-access=free }}</ref> They further predicted that an intellectually stratified society would adopt a new form of conservatism along Latin American lines and could evolve into a "custodial state" that would undermine American traditions of individualism and equal rights.<ref name="tucker2023"/>

They also predict increasing [[totalitarianism]]: "It is difficult to imagine the United States preserving its heritage of individualism, equal rights before the law, free people running their own lives, once it is accepted that a significant part of the population must be made permanent wards of the states."<ref>p.&nbsp;526.</ref>

The authors recommended the elimination of welfare policies which they claim encourage poor women to have babies.<ref>pp. 548–549.</ref>

==Reception==
{{Very long section|date=September 2024}}
''The Bell Curve'' received a great deal of media attention. The book was not distributed in advance to the media, except for a few select reviewers picked by Murray and the publisher, which delayed more detailed critiques for months and years after the book's release.<ref name=":0">{{Cite news |url=http://www.slate.com/articles/briefing/articles/1997/01/the_bell_curve_flattened.html |title=The Bell Curve Flattened |last=Lemann |first=Nicholas |date=1997-01-18 |newspaper=Slate |language=en-US |issn=1091-2339 |access-date=2016-09-10}}</ref> [[Stephen Jay Gould]], reviewing the book in ''[[The New Yorker]]'', said that the book "contains no new arguments and presents no compelling data to support its anachronistic [[social Darwinism]]" and said that the "authors omit facts, misuse statistical methods, and seem unwilling to admit the consequence of their own words."<ref name=":1">{{Cite magazine |url=https://chance.dartmouth.edu/course/topics/curveball.html |title=Curveball |last=Gould |first=Stephen Jay |date=1994-11-28 |magazine=The New Yorker |access-date=2016-09-10}}</ref>

A 1995 article by [[Fairness and Accuracy in Reporting]] writer [[Jim Naureckas]] criticized the media response, saying that "While many of these discussions included sharp criticisms of the book, media accounts showed a disturbing tendency to accept Murray and Herrnstein's premises and evidence even while debating their conclusions".<ref name=":4">[http://fair.org/extra-online-articles/racism-resurgent/ "Racism Resurgent: How Media Let The Bell Curve's Pseudo-Science Define the Agenda on Race"] by Jim Naureckas January/February 1995</ref> A 1995 article by the [[Brookings Institution]] argued that critics had narrowly focused their attention on the book's arguments regarding race and intelligence while ignoring other contents of the book, but added that "the book may have fared even worse had the discussion of race and genetics not distracted attention from some serious problems of analysis and logic in its main arguments. There are indeed some useful messages in the book. But there is also much wrong with it."<ref>{{Cite web |last1=T. Dickens |first1=William |last2=L. Schultze |first2=Charles |last3=J. Kane |first3=Thomas |date=1995-06-01 |title=Does The Bell Curve Ring True? A Closer Look at a Grim Portrait of American Society |url=https://www.brookings.edu/articles/does-the-bell-curve-ring-true-a-closer-look-at-a-grim-portrait-of-american-society/ |access-date=2022-09-25 |website=[[Brookings Institution]] |language=en-US}}</ref>

After reviewers had more time to review the book's research and conclusions, more significant criticisms began to appear.<ref name=":0" /> [[Nicholas Lemann]], writing in [[Slate (magazine)|''Slate'']], said that later reviews showed the book was "full of mistakes ranging from sloppy reasoning to mis-citations of sources to outright mathematical errors."<ref name=":0" /> Lemann said that "Unsurprisingly, all the mistakes are in the direction of supporting the authors' thesis."<ref name=":0" />

Many criticisms were collected in the book ''[[The Bell Curve Debate]]''.

===Lack of peer review===
Herrnstein and Murray did not submit their work to [[peer review]] before publication, an omission many have seen as incompatible with their presentation of it as a scholarly text.<ref name=":0" /><ref>Arthur S. Goldberger and Charles F. Manski (1995) "Review Article: ''The Bell Curve by Herrnstein and Murray''", ''Journal of Economic Literature'', 36(2), June 1995, pp. 762–776. "HM and their publishers have done a disservice by circumventing peer review.... a process of scientific review is now under way. But, given the process to date, peer review of ''The Bell Curve'' is now an exercise in damage control{{nbsp}}..."</ref> [[Nicholas Lemann]] noted that the book was not circulated in [[Galley proof|galley proofs]], a common practice to allow potential reviewers and media professionals an opportunity to prepare for the book's arrival.<ref name=":0" />

==="Mainstream Science on Intelligence" statement===
{{Main article|Mainstream Science on Intelligence}}

{{anchor|Mainstream Science on Intelligence|reason=Old section name, probably has incoming links.}}
An opinion statement endorsing a number of the views presented in ''The Bell Curve'' called "[[Mainstream Science on Intelligence]]"<ref name="Gottfredson 1997 13–23">{{cite journal |last=Gottfredson |first=Linda S. |author-link=Linda Gottfredson |date=1997 |title=Mainstream Science on Intelligence (editorial) |url=http://www.udel.edu/educ/gottfredson/reprints/1997mainstream.pdf |journal=Intelligence |volume=24 |pages=13–23 |doi=10.1016/s0160-2896(97)90011-8 |issn=0160-2896}}</ref> was published in ''[[The Wall Street Journal]]'' in 1994 and subsequently reprinted in the journal ''[[Intelligence (journal)|Intelligence]]''. The statement was drafted by [[Linda Gottfredson]], a professor of [[educational psychology]] at the [[University of Delaware]]. It was sent to 131 researchers whom Gottfredsen described as "experts in intelligence and allied fields". Of these, 52 signed the statement, 48 returned the request with an explicit refusal to sign, and 31 ignored the request.<ref name="Gottfredson 1997 17–20">{{harvnb|Gottfredson|1997|pp=17–20}}</ref><ref name=":02">{{cite web |title=Linda Gottfredson |url=https://www.splcenter.org/fighting-hate/extremist-files/individual/linda-gottfredson |access-date=2018-02-11 |website=[[Southern Poverty Law Center]] |language=en}}</ref>

According to a 1996 response by former [[American Psychological Association]] president [[Donald T. Campbell|Donald Campbell]], only ten of those who signed were actual experts in intelligence measurement.<ref name="Campbell 1996">{{harvnb|Campbell|1996}}</ref> The [[Southern Poverty Law Center]] reports that 20 of the signers were recipients of funding from the [[White supremacy|white-supremacist]] organization the [[Pioneer Fund]], including Gottfredson herself.<ref name=":02" />

In subsequent years, both the substance and the interpretation of this letter have received widespread criticism from the scientific community.<ref name="Graves 1995 279–280">{{harvnb|Graves|Johnson|1995|pp=279–280}}</ref><ref name="Laosa 1996">{{harvnb|Laosa|1996}}</ref><ref name="Campbell 1996" /><ref name="Harrington 1997 116–118">{{harvnb|Harrington|1997|pp=116–118}}</ref><ref>{{harvtxt|Alderfer|2003}}</ref><ref>{{harvtxt|Armour-Thomas|2003}}</ref>

===APA task force report===
{{Main article|Intelligence: Knowns and Unknowns}}
{{Primary sources|section|date=December 2019}}
In response to the controversy surrounding ''The Bell Curve'', the [[American Psychological Association]]'s Board of Scientific Affairs established a special task force chaired by [[Ulric Neisser]] to publish an investigative report focusing solely on the research presented in the book, not the policy recommendations that it made. The report, "[[Intelligence: Knowns and Unknowns]]", was first released in 1995 and published in ''[[American Psychologist]]'' in 1996.<ref>{{cite journal |last1=Neisser |first1=Ulric |date=1996 |title=Intelligence: Knowns and Unknowns |url=http://www.gifted.uconn.edu/siegle/research/Correlation/Intelligence.pdf |journal=American Psychologist |volume=51 |issue=2 |pages=77–101 |doi=10.1037/0003-066X.51.2.77 |last2=Boodoo |first2=Gwyneth |last3=Bouchard |first3=Thomas J. Jr. |last4=Boykin |first4=A. Wade |last5=Brody |first5=Nathan |last6=Ceci |first6=Stephen J. |last7=Halpern |first7=Diane F. |last8=Loehlin |first8=John C. |last9=Perloff |first9=Robert |last10=Sternberg |first10=Robert J. |last11=Urbina |first11=Susana}}</ref>

Regarding explanations for racial differences, the APA task force stated:

{{blockquote|text=The cause of that differential is not known; it is apparently not due to any simple form of bias in the content or administration of the tests themselves. The [[Flynn effect]] shows that environmental factors can produce differences of at least this magnitude, but that effect is mysterious in its own right. Several culturally based explanations of the Black/White IQ differential have been proposed; some are plausible, but so far none has been conclusively supported. There is even less empirical support for a genetic interpretation. In short, no adequate explanation of the differential between the IQ means of Blacks and Whites is presently available.}}

''American Psychologist'' subsequently published eleven critical responses in January 1997.<ref>{{harvtxt|Alderfer|2003}}</ref>

===Criticism of assumptions===

====Criticism by Stephen Jay Gould====

[[Stephen Jay Gould]] wrote that the "entire argument" of the authors of ''The Bell Curve'' rests on four unsupported, and mostly false, assumptions about intelligence:<ref name=":1" /><ref>{{Cite web |url=https://bolesblogs.com/1998/03/23/a-review-of-the-bell-curve-bad-science-makes-for-bad-conclusions/ |title=A Review of ''The Bell Curve'': Bad Science Makes for Bad Conclusions |date=1998-03-23 |website=David Boles, Blogs |access-date=2016-09-10}}</ref>
# Intelligence must be reducible to a single number.
# Intelligence must be capable of rank ordering people in a linear order.
# Intelligence must be primarily genetically based.
# Intelligence must be essentially immutable.

In a 1995 interview with [[Frank Miele]] of ''[[Skeptic (U.S. magazine)|Skeptic]]'', Murray denied making each of these four assumptions.<ref name=miele-interview>{{cite news |last1=Miele |first1=Frank |author-link1=Frank Miele |title=An Interview with the Author of The Bell Curve |url=http://www.skeptic.com/archives24.html |access-date=November 26, 2019 |work=[[Skeptic (U.S. magazine)]] |date=1995 |archive-url=https://web.archive.org/web/20050205010706/http://www.skeptic.com/archives24.html |archive-date=February 5, 2005}}</ref>

====Criticism by James Heckman====
The [[Nobel Memorial Prize]]-winning economist [[James Heckman]] considers two assumptions made in the book to be questionable: that ''g'' accounts for [[correlation]] across test scores and performance in society, and that ''g'' cannot be manipulated. Heckman's reanalysis of the evidence used in ''The Bell Curve'' found contradictions:
# The factors that explain wages receive different weights than the factors that explain test scores. More than ''g'' is required to explain either.
# Other factors besides ''g'' contribute to social performance, and they can be manipulated.<ref name=heckman>{{Cite journal |last=Heckman |first=James J. |date=1995 |title=Lessons from the Bell Curve |journal=[[Journal of Political Economy]] |volume=103 |issue=5 |pages=1091–1120 |doi=10.1086/262014 |s2cid=153463195}}.</ref>
In response, Murray argued that this was a [[straw man]] and that the book does not argue that ''g'' or IQ are totally immutable or the only factors affecting outcomes.<ref>August 1995 letter exchange in ''[[Commentary (magazine)|Commentary]]'' magazine</ref>

In a 2005 interview, Heckman praised ''The Bell Curve'' for breaking "a taboo by showing that differences in ability existed and predicted a variety of socioeconomic outcomes" and for playing "a very important role in raising the issue of differences in ability and their importance" and stated that he was "a bigger fan of [''The Bell Curve''] than you might think." However, he also maintained that Herrnstein and Murray overestimated the role of heredity in determining intelligence differences.<ref name="theregion">''[https://www.minneapolisfed.org/publications_papers/pub_display.cfm?id=3278 Interview with James Heckman]''. Douglas Clement. June 2005. ''The Region.''</ref>

====Criticism by Noam Chomsky====

In 1995, [[Noam Chomsky]], a founder in the field of [[cognitive science]], criticized the book and its assumptions on IQ. He takes issue with the idea that IQ is 60% heritable, arguing that the "statement is meaningless" because [[heritability]] does not have to be genetic. Chomsky gives the example of women wearing [[earrings]]:

{{blockquote|To borrow an example from [[Ned Block]], "some years ago when only women wore earrings, the heritability of having an earring was high because differences in whether a person had an earring was due to a chromosomal difference, XX vs. XY." No one has yet suggested that wearing earrings, or ties, is "in our genes," an inescapable fate that environment cannot influence, "dooming the liberal notion."<ref name=Rollback>[https://chomsky.info/199505__/ Rollback, Part II] Noam Chomsky, 1995</ref>}}He goes on to say there is almost no evidence of a genetic link, and greater evidence that environmental issues are what determine IQ differences.

==== Criticism by Ned Block ====
{{See also|Race and intelligence#heritability within and between groups}}
Philosopher [[Ned Block]] argues that ''The Bell Curve'' misleads about intelligence as it conflates genetic determination with [[heritability]].<ref name=":2">{{Cite web |last=Block |first=Ned |date=January 6, 1996 |title=How Heritability Misleads about Race |url=https://www.nyu.edu/gsas/dept/philo/faculty/block/papers/Heritability.html |website=[[NYU]]}}</ref> Genetic determination and heritability are not interchangeable as there are traits that are genetically determined but not heritable, and vice versa. For example, the number of fingers on a human hand is genetically determined as genes code for five fingers in nearly everybody. However, the heritability of the number of fingers is very low, as variations in numbers of fingers are usually environmentally caused. The aforementioned earring example quoted by Chomsky is an instance where the opposite is true: high heritability, but not genetic determination.<ref name=":2" /> Given that genetic determination and heritability are not equivalent, Block contends that IQ is one such trait that is heritable but not genetically determined. Finally, Block contends that using twin studies to randomize the environment automatically fails: Black twins will always bring a part of their environment with them as they are both Black and will be treated as such.<ref name=":2" />

Canadian psychologist [[Sidney Segalowitz]] concurs with Block that twin studies fail to draw conclusions about heritability, and as a result Murray's work is methodologically flawed.<ref>{{Cite journal |last=Segalowitz |first=Sidney J. |date=October 1999 |title=Why twin studies really don't tell us much about human heritability |url=http://dx.doi.org/10.1017/s0140525x99442207 |journal=Behavioral and Brain Sciences |volume=22 |issue=5 |pages=904–905 |doi=10.1017/s0140525x99442207 |s2cid=143865688 |issn=0140-525X|url-access=subscription }}</ref>

=== Statistical methods ===
[[Claude S. Fischer]], [[Michael Hout]], Martín Sánchez Jankowski, Samuel R. Lucas, [[Ann Swidler]], and Kim Voss in the book ''[[Inequality by Design]]'' recalculated the effect of socioeconomic status, using the same variables as ''The Bell Curve'', but weighting them differently. They found that if IQ scores are adjusted, as Herrnstein and Murray did, to eliminate the effect of [[education]], the ability of IQ to predict [[poverty]] can become dramatically larger, by as much as 61 percent for whites and 74 percent for blacks. According to the authors, Herrnstein and Murray's finding that IQ predicts poverty much better than socioeconomic status is substantially a result of the way they handled the statistics.<ref>''[http://press.princeton.edu/titles/5877.html Inequality by Design: Cracking the Bell Curve Myth]'' Claude S. Fischer, Michael Hout, Martín Sánchez Jankowski, Samuel R. Lucas, Ann Swidler, and Kim Vos.  Princeton University Press, 1996.</ref>

In August 1995, [[National Bureau of Economic Research]] [[economist]] Sanders Korenman and [[Harvard University]] sociologist [[Christopher Winship]] argued that measurement error was not properly handled by Herrnstein and Murray. Korenman and Winship concluded: "...{{nbsp}}there is evidence of substantial bias due to measurement error in their estimates of the effects of parents' socioeconomic status. In addition, Herrnstein and Murray's measure of parental socioeconomic status (SES) fails to capture the effects of important elements of family background (such as single-parent family structure at age 14). As a result, their analysis gives an exaggerated impression of the importance of IQ relative to parents' SES, and relative to family background more generally. Estimates based on a variety of methods, including analyses of siblings, suggest that parental family background is at least as important, and may be more important than IQ in determining socioeconomic success in adulthood."<ref>http://ssrn.com/abstract=225294 Korenman, Sanders and Winship, Christopher, "A Reanalysis of The Bell Curve" (August 1995). NBER Working Paper Series, Vol. w5230, 1995.</ref>

In the book ''Intelligence, Genes, and Success: Scientists Respond to The Bell Curve'', a group of social scientists and statisticians analyzes the genetics-intelligence link, the concept of intelligence, the malleability of intelligence and the effects of education, the relationship between [[cognitive ability]], [[wage]]s and [[meritocracy]], pathways to racial and ethnic [[inequalities in health]], and the question of [[Policy|public policy]]. This work argues that much of the public response was polemic, and failed to analyze the details of the science and validity of the statistical arguments underlying the book's conclusions.<ref name="devlin"/>

=== Use of Armed Forces Qualification Test ===
William J. Matthews writes that part of ''The Bell Curve'''s analysis is based on the [[Armed Services Vocational Aptitude Battery|Armed Forces Qualification Test]] (AFQT) "which is not an IQ test but designed to predict performance of certain criterion variables".<ref name="badscience">William J. Matthews, Ph.D. (1998) ''[http://goinside.com/1998/03/23/a-review-of-the-bell-curve-bad-science-makes-for-bad-conclusions/ A Review of the Bell Curve: Bad Science Makes for Bad Conclusions]''</ref> The AFQT covers subjects such as trigonometry.<ref name=":0" />

Heckman observed that the AFQT was designed only to predict success in military training schools and that most of these tests appear to be achievement tests rather than ability tests, measuring factual knowledge and not pure ability. He continues:<ref name=heckman/><ref name="reason">''[http://www.reason.com/news/show/29636.html Cracked Bell]'' James J. Heckman. March 1995. ''Reason''</ref>

{{blockquote|Ironically, the authors delete from their composite AFQT score a timed test of numerical operations because it is not highly correlated with the other tests. Yet it is well known that in the data they use, this subtest is the single best predictor of earnings of all the AFQT test components. The fact that many of the subtests are only weakly correlated with each other, and that the best predictor of earnings is only weakly correlated with their "g-loaded" score, only heightens doubts that a single-ability model is a satisfactory description of human intelligence. It also drives home the point that the "g-loading" so strongly emphasized by Murray and Herrnstein measures only agreement among tests—not predictive power for socioeconomic outcomes. By the same token, one could also argue that the authors have biased their empirical analysis against the conclusions they obtain by disregarding the test with the greatest predictive power.}}

[[Janet Currie]] and Duncan Thomas presented evidence suggesting AFQT scores are likely better markers for family background than "intelligence" in a 1999 study:
{{blockquote|Herrnstein and Murray report that conditional on maternal "intelligence" (AFQT scores), child test scores are little affected by variations in socio-economic status. Using the same data, we demonstrate their finding is very fragile.<ref>"The Intergenerational Transmission of 'Intelligence' Down the Slippery Slopes of ''The Bell Curve''". ''Industrial Relations: A Journal of Economy and Society'', Vol. 38, No. 3, July 1999</ref>}}

=== Cognitive sorting and the "cognitive elite" concept ===
The cognitive elite concept has been widely criticized. Frank Wilson refuted "as cultural superstition and social science pornography ''The Bell Curve'''s theories on the role of intelligence in the social stratification of postindustrial America."<ref>{{cite journal |last1=Wilson |first1=Frank Harold |date=1995 |title=For Whom Does the Bell Toll?: Meritocracy, the Cognitive Elite, and the Continuing Significance of Race in Postindustrial America |journal=The Journal of Negro Education |volume=64 |issue=3 |pages=253–266 |doi=10.2307/2967207 |jstor=2967207}}</ref> Nicholas Lemann described the notion of a cognitive elite as "a sociological cartoon with political uses, not a phenomenon to be accepted at face value."<ref>{{cite book |last1=Lemann |first1=Nicholas |title=Intelligence, Genes, and Success |publisher=Springer New York |year=1997 |isbn=978-0-387-94986-4 |pages=[https://archive.org/details/intelligencegene00bern/page/315 315–325] |language=en |chapter=Is There a Cognitive Elite in America? |doi=10.1007/978-1-4612-0669-9_14 |chapter-url=https://archive.org/details/intelligencegene00bern/page/315}}</ref>

{{ill|Charles R. Tittle|de}} and Thomas Rotolo found that the more the written, IQ-like, examinations are used as screening devices for occupational access, the stronger the relationship between IQ and income. Thus, rather than higher IQ leading to status attainment because it indicates skills needed in a modern society, IQ may reflect the same test-taking abilities used in artificial screening devices by which status groups protect their domains.<ref>"IQ and Stratification: An Empirical Evaluation of Herrnstein and Murray's Social Change Argument". Charles R. Tittle, Thomas Rotolo ''Social Forces'', Vol. 79, No. 1 (Sep. 2000), pp. 1–28</ref>

Min-Hsiung Huang and [[Robert M. Hauser]] write that Herrnstein and Murray provide scant evidence of growth in cognitive sorting. Using data from the General Social Survey, they tested each of these hypotheses using a short verbal ability test which was administered to about 12,500 American adults between 1974 and 1994; the results provided no support for any of the trend hypotheses advanced by Herrnstein and Murray. One chart in ''The Bell Curve'' purports to show that people with IQs above 120 have become "rapidly more concentrated" in high-IQ occupations since 1940. But Robert Hauser and his colleague Min-Hsiung Huang retested the data and came up with estimates that fell "well below those of Herrnstein and Murray." They add that the data, properly used, "do not tell us anything except that selected, highly educated occupation groups have grown rapidly since 1940."<ref>''[http://www.ingentaconnect.com/content/ap/so/1997/00000026/00000003/art00604 Verbal Ability and Socioeconomic Success: A Trend Analysis]'' Hauser R. M.; Huang M. H.</ref>

In 1972, [[Noam Chomsky]] questioned Herrnstein's idea that society was developing towards a [[meritocracy]]. Chomsky criticized the assumptions that people only seek occupations based on material gain. He argued that Herrnstein would not want to become a baker or lumberjack even if he could earn more money that way. He also criticized the assumption that such a society would be fair with pay based on value of contributions. He argued that because there are already substantial inequalities, people will often be paid at levels that preserve such inequalities rather than commensurately with their contribution to society.<ref name=Chomsky>Chomsky, Noam. 1972. "[http://newlearningonline.com/new-learning/chapter-6-the-nature-of-learning/chomsky-on-iq-and-inequality/ "Chomsky on IQ and inequality". ''I.Q. Tests: Building Blocks for the New Class System''] {{webarchive|url=https://web.archive.org/web/20110511220049/http://newlearningonline.com/new-learning/chapter-6-the-nature-of-learning/chomsky-on-iq-and-inequality/ |date=2011-05-11 }}." ''Rampart'': 24–30. pp. 26–28, 30.</ref>

===Race and intelligence===
{{see also|History of the race and intelligence controversy}}

One part of the controversy concerned the parts of the book which dealt with racial group differences on IQ and the consequences of this. In chapter 13, the authors state: "It seems highly likely to us that both genes and the environment have something to do with racial differences." The introduction to the chapter, however, provides the caveat that "The debate about whether and how much genes and environment have to do with ethnic differences remains unresolved".

In an article praising the book, economist [[Thomas Sowell]] criticized some of its aspects, including some of its arguments about race and the malleability of IQ:

{{blockquote|When European immigrant groups in the United States scored below the national average on mental tests, they scored lowest on the abstract parts of those tests. So did white mountaineer children in the United States tested back in the early 1930s ... Strangely, Herrnstein and Murray refer to "folklore" that "Jews and other immigrant groups were thought to be below average in intelligence." It was neither folklore nor anything as subjective as thoughts. It was based on hard data, as hard as any data in ''The Bell Curve''. These groups repeatedly tested below average on the mental tests of the World War I era, both in the army and in civilian life. For Jews, it is clear that later tests showed radically different results—during an era when there was very little intermarriage to change the genetic makeup of American Jews.<ref>{{cite journal |url=http://search.opinionarchives.com/Summary/AmericanSpectator/V28I2P32-1.htm |title=Ethnicity and IQ |first=Thomas |last=Sowell |date=1995 |volume=28 |issue=2 |journal=[[The American Spectator]]}}</ref>}}

In 1996, [[Stephen Jay Gould]] released a revised and expanded edition of his 1981 book ''[[The Mismeasure of Man]]'', intended to more directly refute many of ''The Bell Curve'''s claims regarding [[race and intelligence]], and argued that the evidence for [[heritability of IQ]] did not indicate a genetic origin to group differences in intelligence.<ref>{{cite journal |last1=Flynn |first1=J. R. |date=1999 |title=Evidence against Rushton: The Genetic Loading of the Wisc-R Subtests and the Causes of Between-Group IQ Differences |journal=Personality and Individual Differences |volume=26 |issue=2 |pages=373–393 |doi=10.1016/s0191-8869(98)00149-4}}</ref><ref>{{cite book |last1=Gould |first1=Stephen Jay |title=The mismeasure of man |date=1996 |publisher=Norton |location=New York |isbn=978-0-393-31425-0 |edition=Rev. and expanded}}</ref>

Psychologist [[David Marks (psychologist)|David Marks]] has suggested that the [[Armed Services Vocational Aptitude Battery|ASVAB]] test used in the analyses of ''The Bell Curve'' correlates highly with measures of literacy, and argues that the ASVAB test in fact is not a measure of general intelligence but of literacy.<ref>{{cite journal |last=Marks |first=D. F. |year=2010 |title=IQ variations across time, race, and nationality: an artifact of differences in literacy skills |journal=Psychological Reports |volume=106 |issue=3 |pages=643–664 |doi=10.2466/pr0.106.3.643-664 |pmid=20712152 |s2cid=12179547}}</ref><ref name="psychologytoday.com">{{Cite web |url=http://www.psychologytoday.com/blog/beautiful-minds/201008/the-flynn-effect-and-iq-disparities-among-races-ethnicities-and-nations- |title=The Flynn Effect and IQ Disparities Among Races, Ethnicities, and Nations: Are There Common Links? |first=Scott Barry |last=Kaufman |date=August 23, 2010 |work=Psychology Today |access-date=May 4, 2020}}</ref>

[[Melvin Konner]], professor of [[anthropology]] and associate professor of [[psychiatry]] and [[neurology]] at [[Emory University]], called ''Bell Curve'' a "deliberate assault on efforts to improve the school performance of African-Americans":

{{blockquote|This book presented strong evidence that genes play a role in intelligence but linked it to the unsupported claim that genes explain the small but consistent black-white difference in IQ. The juxtaposition of good argument with a bad one seemed politically motivated, and persuasive refutations soon appeared. Actually, African-Americans have excelled in virtually every enriched environment they have been placed in, most of which they were previously barred from, and this in only the first decade or two of improved but still not equal opportunity. It is likely that the real curves for the two races will one day be superimposable on each other, but this may require decades of change and different environments for different people. Claims about genetic potential are meaningless except in light of this requirement.<ref>{{cite book |last=Konnor |first=Melvin |year=2003 |title=The Tangled Wing: Biological Constraints on the Human Spirit |edition=2nd |publisher=Henry Holt and Company |page=428}}</ref>}}

The 2014 textbook ''Evolutionary Analysis'' by Herron and Freeman<ref>{{Cite book |title=Evolutionary Analysis |last=Herron and Freeman |first=Jon and Scott |publisher=Pearson |year=2014 |location=Boston |pages=360–363}}</ref> devoted an entire chapter to debunking what they termed the "Bell Curve fallacy", saying that "Murray and Herrnstein's argument amounts to little more than an appeal to
personal incredulity" and that it is a mistake to think that heritability can tell us something about the causes of differences between population means. In reference to the comparison of African-American with European-American IQ scores, the text states that only a common garden experiment, in which the two groups are raised in an environment typically experienced by European-Americans, would allow one to see if the difference is genetic. This kind of experiment, routine with plants and animals, cannot be conducted with humans. Nor is it possible to approximate this design with adoptions into families of the different groups, because the children would be recognizable and possibly be treated differently. The text concludes: "There is no way to assess whether genetics has anything to do with the difference in IQ score between ethnic groups."

Rutledge M. Dennis suggests that through [[soundbite]]s of works like [[Arthur Jensen|Jensen]]'s famous study on the achievement gap, and Herrnstein and Murray's book ''The Bell Curve'', the media "paints a picture of Blacks and other people of color as collective biological illiterates—as not only intellectually unfit but evil and criminal as well", thus providing, he says "the logic and justification for those who would further disenfranchise and exclude racial and ethnic minorities".<ref>{{cite journal |last=Dennis |first=Rutledge M. |url=http://www33.homepage.villanova.edu/edward.fierros/pdf/Dennis,%20Social%20Darwinism.pdf |title=Social Darwinism, scientific racism, and the metaphysics of race |journal=Journal of Negro Education |date=Summer 1995 |volume=64 |issue=3 |pages=243–252 |doi=10.2307/2967206 |jstor=2967206}}</ref>

[[Charles Lane (journalist)|Charles Lane]] pointed out that 17 of the researchers whose work is referenced by the book have also contributed to ''[[Mankind Quarterly]]'', a journal of anthropology founded in 1960 in Edinburgh, which has been viewed as supporting the theory of the genetic superiority of white people.<ref>{{Cite news |url=http://www.nybooks.com/articles/archives/1994/dec/01/the-tainted-sources-of-the-bell-curve/ |title=The Tainted Sources of 'The Bell Curve' |last=Lane |first=Charles |date=1994-12-01 |newspaper=The New York Review of Books |issn=0028-7504 |access-date=2016-09-10}}</ref> David Bartholomew reports Murray's response as part of the controversy over the Bell Curve.<ref>{{cite book |last=Bartholomew |first=David J. |title=Measuring Intelligence: Facts and Fallacies |url=https://archive.org/details/measuringintelli00bart |url-access=limited |publisher=Cambridge University Press |location=Cambridge |year=2004 |page=[https://archive.org/details/measuringintelli00bart/page/n25 10] |isbn=978-0-521-54478-8}}</ref> In his afterword to the 1996 Free Press edition of ''The Bell Curve'', Murray responded that the book "draws its evidence from more than a thousand scholars" and among the researchers mentioned in Lane's list "are some of the most respected psychologists of our time and that almost all of the sources referred to as tainted are articles published in leading refereed journals".<ref name="Curve">{{cite book |last1=Herrnstein |first1=Richard J. |last2=Murray |first2=Charles |title=The Bell Curve |publisher=Free Press |location=New York |year=1996 |page=564}}</ref>

''The Bell Curve Wars: Race, Intelligence, and the Future of America'' is a collection of articles published in reaction to the book. Edited by Steven Fraser, the writers of these essays do not have a specific viewpoint concerning the content of ''The Bell Curve'', but express their own critiques of various aspects of the book, including the research methods used, the alleged hidden biases in the research and the policies suggested as a result of the conclusions drawn by the authors.<ref>{{cite book |title=The Bell Curve Wars: race, intelligence, and the future of America |date=1995 |publisher=Basic Books |location=New York |isbn=978-0-465-00693-9 |url=https://archive.org/details/bellcurvewarsrac00fras/page/ |editor=Steven Fraser}}{{page needed|date=September 2019}}</ref> Fraser writes that "by scrutinizing the footnotes and bibliography in ''The Bell Curve'', readers can more easily recognize the project for what it is: a chilly synthesis of the work of disreputable race theorists and eccentric [[eugenicists]]".<ref>{{cite book |editor-last=Fraser |editor-first=Steven |title=The Bell Curve Wars: Race, Intelligence, and the Future of America |date=1995 |publisher=Basic Books |isbn=978-0-465-00693-9 |oclc=782205959 |url=https://archive.org/details/bellcurvewarsrac00fras |access-date= |url-access= |via=}}</ref>

==== Allegations of racism ====
Since the book provided statistical data making the assertion that blacks were, on average, less intelligent than whites, some people have argued that ''The Bell Curve'' could be used by extremists to justify genocide and hate crimes.<ref>{{cite web |url=http://www.talkreason.org/articles/coultergeist.cfm |title=Ann Coulter and Charles Darwin. Coultergeist |archive-url=https://web.archive.org/web/20090430200549/http://www.talkreason.org/articles/coultergeist.cfm |archive-date=2009-04-30 |url-status=live |first=Jerry |last=Coyne |date=August 2, 2006 |work=TalkReason |access-date=May 4, 2020}}</ref><!-- Student essay, not a reliable source: <ref>{{cite web |url=http://serendip.brynmawr.edu/biology/b103/f01/web3/bishay.html |title=The Bell Curve: An illustration of the existence of social science as a social problem |url=https://serendipstudio.org/biology/b103/f01/web3/bishay.html |year=2001 |first=Vivian |last=Bishay |publisher=Serendip Studio |access-date=May 4, 2020}}</ref>--> Much of the work referenced by ''The Bell Curve'' was funded by the [[Pioneer Fund]], which aims to advance the scientific study of heredity and human differences, and which has been accused of promoting [[white supremacist]] views, particularly [[scientific racism]].<ref>{{cite web |url=https://fair.org/home/racism-resurgent/ |title=Racism Resurgent |work=FAIR |date=January 1, 1995 |first=Jim |last=Naureckas |access-date=May 4, 2020}}</ref><ref>{{cite web |url=http://www.hartford-hwp.com/archives/45/049.html |title=The Bell Curve and the Pioneer Fund |format=transcript from ABC World News Tonight |date=November 22, 1994 |via=Hartford Web Publishing |access-date=May 4, 2020}}</ref><ref>{{cite web |title=Moral Courage: Is defending The Bell Curve an example of intellectual honesty? |first=Stephen |last=Metcalf |date=October 17, 2005 |work=Slate |url=http://www.slate.com/id/2128199/ |access-date=May 4, 2020}}</ref><ref>{{Cite journal |last=Rosenthal |first=Steven J. |date=1995 |title=The Pioneer Fund: Financier of Fascist Research |url=http://journals.sagepub.com/doi/10.1177/0002764295039001006 |journal=American Behavioral Scientist |language=en |volume=39 |issue=1 |pages=44–61 |doi=10.1177/0002764295039001006 |issn=0002-7642|url-access=subscription }}</ref> Murray criticized the characterization of the Pioneer Fund as a racist organization, arguing that it has as much relationship to its founder as "[[Henry Ford]] and today's [[Ford Foundation]]".<ref>Herrnstein & Murray (1994) p. 564.</ref>

Evolutionary biologist [[Joseph L. Graves]] described ''The Bell Curve'' as an example of racist science, containing all the types of errors in the application of scientific method that have characterized the history of [[scientific racism]]:
# Claims that are not supported by the data given
# Errors in calculation that invariably support the hypothesis
# No mention of data that contradict the hypothesis
# No mention of theories and data that conflict with core assumptions
# Bold policy recommendations that are consistent with those advocated by racists.<ref>{{cite book |last=Graves |first=Joseph L. |year=2001 |title=The Emperor's New Clothes |url=https://archive.org/details/emperorsnewcloth00grav |url-access=registration |publisher=Rutgers University Press |page=[https://archive.org/details/emperorsnewcloth00grav/page/8 8] |isbn=978-0-8135-2847-2}}</ref>

Eric Siegel wrote on the ''Scientific American'' blog that the book "endorses prejudice by virtue of what it does not say. Nowhere does the book address why it investigates racial differences in IQ. By never spelling out a reason for reporting on these differences in the first place, the authors transmit an unspoken yet unequivocal conclusion: Race is a helpful indicator as to whether a person is likely to hold certain capabilities. Even if we assume the presented data trends are sound, the book leaves the reader on his or her own to deduce how to best put these insights to use. The net effect is to tacitly condone the prejudgment of individuals based on race."<ref>{{cite web |url=https://blogs.scientificamerican.com/guest-blog/the-real-problem-with-charles-murray-and-the-bell-curve/ |title=The Real Problem with Charles Murray and 'The Bell Curve' |first=Eric |last=Siegel |date=April 12, 2017 |work=Scientific American |access-date=May 4, 2020}}</ref> Similarly, Howard Gardner accused the authors of engaging in "scholarly [[brinkmanship]]", arguing that "Whether concerning an issue of science, policy, or rhetoric, the authors come dangerously close to embracing the most extreme positions, yet in the end shy away from doing so&nbsp;... Scholarly brinkmanship encourages the reader to draw the strongest conclusions, while allowing the authors to disavow this intention."<ref>{{Cite magazine |last=Gardner |first=Howard |author-link=Howard Gardner |date=Winter 1995 |title=Cracking Open the IQ Box |url=http://prospect.org/article/cracking-open-iq-box |magazine=[[The American Prospect]] |language=en}}</ref>

Columnist [[Bob Herbert]], writing for ''[[The New York Times]]'', described the book as "a scabrous piece of racial pornography masquerading as serious scholarship". "Mr. Murray can protest all he wants", wrote Herbert; "his book is just a genteel way of calling somebody a [[nigger]]."<ref name="nyt-herbert">{{cite news |last=Herbert |first=Bob |author-link=Bob Herbert |date=1994-10-26 |title=In America; Throwing a Curve |newspaper=[[The New York Times]] |url=https://query.nytimes.com/gst/fullpage.html?res=9F01E5DE123FF935A15753C1A962958260 |access-date=2007-01-09}}</ref>

==See also==
* ''[[Human Diversity]]'' (2020) by Charles Murray

==References==
{{Reflist|30em}}

==Sources==
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* {{citation |last=Armour-Thomas |first=Eleanor |title=Assessment of psychometric intelligence for racial and ethnic minorities |pages=357–374 |year=2003 |series=Handbook of racial and ethnic minority psychology (ed. Guillermo Bernal) |publisher=SAGE |isbn=978-0-7619-1965-0}}
* {{citation |last=Campbell |first=Donald T. |title=Unresolved Issues in Measurement Validity : An Autobiographical Overview |journal=Psychological Assessment |volume=8 |issue=4 |pages=363–368 |year=1996 |doi=10.1037/1040-3590.8.4.363 |author-link=Donald T. Campbell}}
* Devlin, Bernie, et al. (1997). ''Intelligence, Genes, and Success: Scientists Respond to The Bell Curve.'' Copernicus Books, {{ISBN|0-387-94986-0}}.
* Fischer, Claude S., et al. (1996). ''[[Inequality by Design: Cracking the Bell Curve Myth]]'' [[Princeton University Press]], {{ISBN|0-691-02898-2}}.
* {{citation |last1=Graves |first1=Joseph L. |title=The Pseudoscience of Psychometry and The Bell Curve |date=1995 |journal=[[The Journal of Negro Education]] |volume=64 |issue=3 |pages=277–294 |doi=10.2307/2967209 |jstor=2967209 |last2=Johnson |first2=Amanda |author-link=Joseph L. Graves}}
* {{citation |last=Harrington |first=Gordon M. |title=Psychological testing, IQ, and evolutionary fitness |journal=Genetica |volume=99 |issue=2–3 |pages=113–123 |year=1997 |doi=10.1007/bf02259515 |pmid=9463067 |s2cid=9866526}}
* {{cite book |ref=refRussell1995 |editor1-last=Jacoby |editor1-first=Russell |editor2-last=Glauberman |editor2-first=Naomi |title=The Bell Curve Debate: History, Documents, Opinions – 81 articles by 81 academics and journalists from the full spectrum of political views on title topic. |publisher=[[Random House]]/[[Times Books]] |date=1995 |pages=[https://archive.org/details/bellcurvedebateh00jaco/page/n735 720] |isbn=978-0-8129-2587-6 |url=https://archive.org/details/bellcurvedebateh00jaco |url-access=registration}}
* {{citation |last=Laosa |first=Luis M. |title=Intelligence testing and social policy |url=https://onlinelibrary.wiley.com/doi/pdf/10.1002/j.2333-8504.1995.tb01667.x |journal=Journal of Applied Developmental Psychology |volume=17 |issue=2 |pages=155–173 |year=1996 |doi=10.1016/S0193-3973(96)90023-4|url-access=subscription }}
* {{cite book |ref=refMontagu1999 |editor1-last=Montagu |editor1-first=Ashley |title=Race and IQ |publisher=[[Oxford University Press]] |date=1999 |pages=[https://archive.org/details/raceiq00ashl/page/n503 496] |isbn=978-0-19-510220-8 |url=https://archive.org/details/raceiq00ashl |url-access=registration}}

==Further reading==
* {{cite journal |vauthors=Devlin B, Daniels M, [[Kathryn Roeder|Roeder K]] |title=The heritability of IQ |journal=Nature |volume=388 |issue=6641 |pages=468–471 |date=July 1997 |pmid=9242404 |doi=10.1038/41319 |bibcode=1997Natur.388..468D |s2cid=4313884 |doi-access=free}}
* {{cite journal |doi=10.1037/0033-295X.108.2.346 |vauthors=Dickens WT, Flynn JR |title=Heritability estimates versus large environmental effects: the IQ paradox resolved |journal=Psychol Rev |volume=108 |issue=2 |pages=346–369 |date=April 2001 |pmid=11381833 |url=http://content.apa.org/journals/rev/108/2/346 |citeseerx=10.1.1.139.2436}}
* {{cite encyclopedia |last=Doherty |first=Brian |author-link=Brian Doherty (journalist) |editor-first=Ronald |editor-last=Hamowy |editor-link=Ronald Hamowy |encyclopedia=The Encyclopedia of Libertarianism |title=Murray, Charles (1943–) |url=https://books.google.com/books?id=yxNgXs3TkJYC |date=2008 |publisher=[[SAGE Publishing|SAGE]]; [[Cato Institute]] |location=Thousand Oaks, CA |doi=10.4135/9781412965811.n211 |isbn=978-1-4129-6580-4 |oclc=750831024 |lccn=2008009151 |pages=344–345}}
* {{Cite book |title=Race: The Reality of Human Difference |last=Sarich |first=Vincent M. |author-link=Vincent Sarich |publisher=[[Basic Books]] |date=2004 |isbn=978-0-8133-4086-9 |title-link=Race: The Reality of Human Difference}}
* {{cite book |last=Tucker |first=William H. |title=The funding of scientific racism: Wickliffe Draper and the Pioneer Fund |author-link=William H. Tucker (psychologist) |publisher=[[University of Illinois Press]] |date=2007 |isbn=978-0-252-07463-9 |orig-date=first published 2002}}
**{{cite journal |author=Andrew S. Winston |title=The Funding of Scientific Racism: Wickliffe Draper and the Pioneer Fund (review) |journal=Journal of the History of Medicine and Allied Sciences |volume=58 |issue=3 |pages=391–392 |date=July 2003 |doi=10.1093/jhmas/jrg016 |url=http://muse.jhu.edu/journals/journal_of_the_history_of_medicine_and_allied_sciences/summary/v058/58.3winston.html}}

==External links==
* [https://archive.org/details/The_Bell_Curve Audiobook of ''The Bell Curve''] read by Murray, (Internet Archive).

===Interviews with Murray===
* [https://www.c-span.org/video/?61965-1/bell-curve Interview with Murray on ''The Bell Curve''], from [[C-SPAN]]'s ''[[Booknotes]]'', aired December 4, 1994.
* ''[[The Open Mind (TV series)|The Open Mind]]'' interview with Charles Murray, 1995 - [https://archive.org/details/openmind_ep994 Part 1], [https://archive.org/details/openmind_ep995 Part 2]
* {{cite web |last=Miele |first=Frank |author-link=Frank Miele |archive-url=https://web.archive.org/web/20050205010706/http://www.skeptic.com/archives24.html |url=https://www.skeptic.com/archives24.html |date=1995 |archive-date=February 5, 2005 |title=Interview with Charles Murray (1995) |work=Skeptic Magazine}}
* [https://www.aei.org/economics/bell-curve-20-years-later-qa-charles-murray/ 'The Bell Curve' 20 years later: A Q&A with Charles Murray], [[American Enterprise Institute]] blog, October 16, 2014
* [[Sam Harris|Harris, Sam]] (April 2017). [https://samharris.org/podcasts/forbidden-knowledge Waking Up Podcast – #73] {{Webarchive|url=https://web.archive.org/web/20180719093830/https://samharris.org/podcasts/forbidden-knowledge/ |date=2018-07-19 }} - interview of Murray.

===Responses to ''The Bell Curve''===
* {{cite journal |last=Rothbard |first=Murray N. |title=Race! That Murray Book |journal=The Rothbard-Rockwell Report |author-link=Murray Rothbard |date=December 1994 |pages=1–9}}
* [[Fairness and Accuracy in Reporting]], [https://web.archive.org/web/20050112003533/http://www.fair.org/extra/9501/bell.html Racism Resurgent: How Media Let The Bell Curve's Pseudo-Science Define the Agenda on Race] (January/February 1995)
* {{cite web |last1=Heckman |first1=James |author1-link=James Heckman |title=Cracked Bell |url=https://reason.com/1995/03/01/cracked-bell/ |website=Reason.com |access-date=September 20, 2021 |date=March 1, 1995}} - critique of Murray and Herrnstein's statistical techniques
* Heckman, James "[https://atrios.blogspot.com/2003/02/even-more-bell-curve.html Lessons from the Bell Curve]", ''Journal of Political Economy'', October 1995.
* Reifman, Alan (2000). [https://web.archive.org/web/20041029144746/http://psycprints.ecs.soton.ac.uk/archive/00000099/ "Revisiting the Bell Curve"], ''[[Psycoloquy]]'' 11, #99
* Siegel, Eric (2017). [https://blogs.scientificamerican.com/voices/the-real-problem-with-charles-murray-and-the-bell-curve/ "The Real Problem with Charles Murray and The Bell Curve], ''Scientific American blog'', April 2017.
* Krenz, Claudia - [http://www.claudiax.net/bell.html Critical analysis of Bell Curve statistical methodology] {{Webarchive|url=https://web.archive.org/web/20080225161219/http://www.claudiax.net/bell.html |date=2008-02-25 }}

{{Authority control}}

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[[Category:1994 non-fiction books]]
[[Category:Books about The Bell Curve| ]]
[[Category:Books about the United States]]
[[Category:Books by Charles Murray]]
[[Category:Books by Richard Herrnstein]]
[[Category:English-language non-fiction books]]
[[Category:Free Press (publisher) books]]
[[Category:Genetics books]]
[[Category:Collaborative non-fiction books]]
[[Category:Race and intelligence controversy]]
[[Category:Scientific racism]]