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Uh oh...maybe it's not all the fault of Lyndon Johnson and American liberals.


Race Differences in Average IQ are Largely Genetic

Published on April 26, 2005 at 5:29 PM


A 60-page review of the scientific evidence, some based on state-of-the-art magnetic resonance imaging (MRI) of brain size, has concluded that race differences in average IQ are largely genetic.

The lead article in the June 2005 issue of Psychology, Public Policy and Law, a journal of the American Psychological Association, examined 10 categories of research evidence from around the world to contrast "a hereditarian model (50% genetic-50% cultural) and a culture-only model (0% genetic-100% cultural)."

The paper, "Thirty Years of Research on Race Differences in Cognitive Ability," by J. Philippe Rushton of the University of Western Ontario and Arthur R. Jensen of the University of California at Berkeley, appeared with a positive commentary by Linda Gottfredson of the University of Delaware, three critical ones (by Robert Sternberg of Yale University, Richard Nisbett of the University of Michigan, and Lisa Suzuki & Joshua Aronson of New York University), and the authors' reply.

"Neither the existence nor the size of race differences in IQ are a matter of dispute, only their cause," write the authors. The Black-White difference has been found consistently from the time of the massive World War I Army testing of 90 years ago to a massive study of over 6 million corporate, military, and higher-education test-takers in 2001.

"Race differences show up by 3 years of age, even after matching on maternal education and other variables," said Rushton. "Therefore they cannot be due to poor education since this has not yet begun to exert an effect. That's why Jensen and I looked at the genetic hypothesis in detail. We examined 10 categories of evidence."

The Worldwide Pattern of IQ Scores. East Asians average higher on IQ tests than Whites, both in the U. S. and in Asia, even though IQ tests were developed for use in the Euro-American culture. Around the world, the average IQ for East Asians centers around 106; for Whites, about 100; and for Blacks about 85 in the U.S. and 70 in sub-Saharan Africa.

Race Differences are Most Pronounced on Tests that Best Measure the General Intelligence Factor (g). Black-White differences, for example, are larger on the Backward Digit Span test than on the less g loaded Forward Digit Span test.

The Gene-Environment Architecture of IQ is the Same in all Races, and Race Differences are Most Pronounced on More Heritable Abilities. Studies of Black, White, and East Asian twins, for example, show the heritability of IQ is 50% or higher in all races.

Brain Size Differences. Studies using magnetic resonance imaging (MRI) find a correlation of brain size with IQ of about 0.40. Larger brains contain more neurons and synapses and process information faster. Race differences in brain size are present at birth. By adulthood, East Asians average 1 cubic inch more cranial capacity than Whites who average 5 cubic inches more than Blacks.

Trans-Racial Adoption Studies. Race differences in IQ remain following adoption by White middle class parents. East Asians grow to average higher IQs than Whites while Blacks score lower. The Minnesota Trans-Racial Adoption Study followed children to age 17 and found race differences were even greater than at age 7: White children, 106; Mixed-Race children, 99; and Black children, 89.

Racial Admixture Studies. Black children with lighter skin, for example, average higher IQ scores. In South Africa, the IQ of the mixed-race "Colored" population averages 85, intermediate to the African 70 and White 100.

IQ Scores of Blacks and Whites Regress toward the Averages of Their Race. Parents pass on only some exceptional genes to offspring so parents with very high IQs tend to have more average children. Black and White children with parents of IQ 115 move to different averages--Blacks toward 85 and Whites to 100.

Race Differences in Other "Life-History" Traits. East Asians and Blacks consistently fall at two ends of a continuum with Whites intermediate on 60 measures of maturation, personality, reproduction, and social organization. For example, Black children sit, crawl, walk, and put on their clothes earlier than Whites or East Asians.

Race Differences and the Out-of-Africa theory of Human Origins. East Asian-White-Black differences fit the theory that modern humans arose in Africa about 100,000 years ago and expanded northward. During prolonged winters there was evolutionary selection for higher IQ created by problems of raising children, gathering and storing food, gaining shelter, and making clothes.

Do Culture-Only Theories Explain the Data? Culture-only theories do not explain the highly consistent pattern of race differences in IQ, especially the East Asian data. No interventions such as ending segregation, introducing school busing, or "Head Start" programs have reduced the gaps as culture-only theory would predict.

In their article, Rushton and Jensen also address some of the policy issues that stem from their conclusions. Their main recommendation is that people be treated as individuals, not as members of groups. They emphasized that their paper pertains only to average differences. They also called for the need to accurately inform the public about the true nature of individual and group differences, genetics and evolutionary biology.

Rushton and Jensen are well-known for research on racial differences in intelligence. Jensen hypothesized a genetic basis for Black-White IQ differences in his 1969 Harvard Educational Review article. His later books Bias in Mental Tests (1980) and The g Factor (1998), as well as Rushton's (1995) Race, Evolution, and Behavior, show that tests are not biased against English speaking minorities and that Black-White-East Asian differences in brain size and IQ belong in an evolutionary framework.

http://www.news-medical.net/news/2005/04/26/9530.aspx

Thanks for the article and link.

ColKlink,

There was a study done after this one which included residence of Israel. They averaged 112.

The Israeli might be smart in many ways, but they can't pay attention worth a F*CK behind the wheel of a car.

Dats Racis!

They ought to set minimum requirements on what IQ a person holds before doing something like.... VOTING.

If they are using the usual r-square correlation, 0.40 is pretty weak, even for field observations of a natural population under uncontrolled conditions, too weak to draw any conclusions I'd guess. Surprised they'd even include it.

Two questions. Well four, really:

1) Based on your own position on the IQ curve, what percentage of colored folk would you predict are smarter than you?

2) Why are you so preoccupied with this issue? You post endlessly on the racial inferiority of Black folks; and use a Nazi-era German office as your avatar. Makes one wonder.

3) What White supremacist forums, if any do you frequent?

4) What changes to our constitution, laws, religion, and culture would you propose?

Birdwatcher

If this is reflective of average Jewish IQ (which we must assume it is), there's an easy explanation for it, and one promoted by organized Jewry itself in their own publications. To wit, those strains of Jews who've retained their Jewish identity over the centuries did so because they maintained the traditions of Jewish identity, most significantly that of being at least minimally literate in Hebrew by the age of thirteen. Those Jews who have, over the expanse of time, found this requirement too rigorous have tended to lose their Jewish identity, thus blending in with whatever population in which they found themselves. In other words, the cited result (Jewish IQ somewhat higher than other whites) is an artifact of the more rigorous intellectual requirements connected with identifying oneself as Jewish, i.e., that of acquiring basic competency in reading Hebrew by age thirteen. Those among Jews who have not are less likely to be identified as Jews, and are thus erroneously excluded from the research, skewing average IQ results for identified Jews upward.

You'd have the same upward skewing, in other words, if you only identified someone as being Asian or White if they'd graduated High School, but neglected applying that standard to blacks, or vice versa. Even more so if the standard regarded a family history of graduating from high school, which is even more akin to Jewish identification.

To be a legitimate measure of average Jewish IQ, that factor would need to be accounted for and eliminated.

Nailed it. I'd bet one of Klink's biggest problems with blacks is that they're always playing the victim card.

Kind of ironic, given his constant whining about race.

Besides, I don't think his real name is Klink. I think it's Shultz.

Nice little vignette the sick ph=ck sent my way some few days back.

He's just a little ray of sunshine, ain't he ?

GTC

He did pick an incompetent Nazi for a name.

so it took these "scientists" 30 years to figure out darkies are toopid???


hang out at the Varsity in downtown Hawtlanta for an hour... MIND BLOWN

Oh I don't know, but I'm just willing to step out there and bet he doesn't wear pocket t-shirts to go out for dinner and you just might...

Benjamin Carson

PS: Bed, Bath and Beyond's having a sheet sale...

I'm still puzzling over them citing a 0.40 r-squared value as evidence for anything. Casts doubt on the authors for sure.

Thanks for sharing that.

Anyways, you were sorely missed at Quemado, by more than a few folks.

Birdwatcher

And reproducing!

Well, being that a majority of WHITES voted to elect obama and many other democraps clearly voids your posit based solely on race...

Sadly, here's a couple of r-squared values that ARE meaningful....

(for those who don't use it much, the way r-square works is the closer to 1.00 the better the correlation)

http://en.wikipedia.org/wiki/Fertility_and_intelligence

In 1982, Daniel Vining sought to address these issues [fertility rate versus intelligence] in a large study on the fertility of over 10,000 individuals throughout the United States, who were then aged 25 to 34. The average fertility in his study was correlated at 0.86 with IQ for white women and 0.96 for black women

High IQ women ain't having kids, at the very least I suppose that calls into question how smart they really are.

Birdwatcher

Yeah, but he made himself a Colonel. No way a white man could make Colonel these days, what with affirmative action holding him down.