107

Our sister site, Law StackExchange, has this same question: Is it truly illegal for the US army to hire someone with IQ less than 83?, with a high-quality accepted answer. The answer is not a simple yes or no, but the claim is not too misleading: the assertion that the law prohibits people with an IQ score of 83 or less from serving in the U.S. military ...


98

The short answer The study in question (Van Hiel et al. 2019) has been published in a reputable peer-reviewed journal. It presents empirical support for the hypothesis that emotional abilities negatively correlate with right-wing attitudes. This answers the question in the title. The question body also asks about the link between cognitive abilities and ...


78

This claim can actually be tested very easily. Others have done it, e.g. Brian Dickerson: The perils of repeating political nonsense and came to the conclusion that the claim was wrong. You just need the chance a random person from a large group has a genius level IQ, then multiply it with the number of people in China and compare the result with the number ...


60

The PISA results are available online. The OECD also published a summary paper which described what PISA is: [T]he OECD Programme for International Student Assessment, PISA, [is] the world’s premier yardstick for evaluating the quality, equity and efficiency of school systems. It does not measure IQ and does not claim to be comparable to IQ. The ...


40

This popular science article, generally backs up Peterson's claims. All military recruits must take the Armed Services Vocational Aptitude Battery (ASVAB) to qualify for enlistment. The ASVAB is essentially an IQ test (correlation = 0.8). The ASVAB predicts SAT scores (correlation = .82). And it correlates with ACT scores (0.77). To qualify, recruits ...


37

N.B. IQ scores are standardized for a given population at a given time. The average IQ is always 100, and its standard deviation is always 15. To compare between times or populations, we must use “raw IQ,” by which I mean the raw scores of a few tests, especially: Raven's Matrices, a test of pattern recognition Digit span, a ...


36

The title of the article is "Sorry, men ARE more brainy than women (and more stupid too!) It's a simple scientific fact, says one of Britain's top dons" - note the bolded part. The article makes two independent claims, only one of which is relevant to the social/political topic being discussed (lack of women in top positions): There are more males with ...


36

Here are the relevant paragraphs from the intro to the paywalled paper justifying the first line of the abstract: Over the years however, it has been acknowledged that right-wing authoritarianism is only one indicator of right-wing attitudes and that such attitudes can be arranged according to two broad dimensions (see, Duckitt & Sibley, 2009; ...


34

Yes. See 30 years of research on race differences in cognitive ability (2005). Currently, the 1.1 standard deviation difference in average IQ between Blacks and Whites in the United States is not in itself a matter of empirical dispute. More recently, it has been observed that "[t]he IQ gap between Blacks and Whites has been reduced by 0.33 SD". They ...


33

TL;DR: To answer the question title, people with no higher education at all in USA voted 51%/47% (+4% margin for Obama) for D/R in 2012 Presidential election. So no, they are not tending "more" to conservative based on Exit Polls in US Presidential election. For educated (college+postgrad), they voted virtually identical with total population averages (51% ...


30

You can read the answer right off the study: no, lack of intelligence is not the main reason because the correlation coefficient between IQ and various measures of religiosity are not that large (e.g. -0.25 for fundamentalism). It is an important reason, as is education (as the study explains, the correlation persists when level of education is accounted ...


30

The ASVAB (AFQT) is not technically an IQ test. IQ Tests, per se, are not issued to recruits for the armed forces. The U.S. Army does test people's capabilities, but not in a standardized IQ test (at least on the scale of the entire military recruit base) because they use a different testing method, the Armed Services Vocational Aptitude Battery (ASVAB). ...


29

The 'study' has apparently since been exposed as a hoax: BBC News: Internet Explorer story was bogus A story which suggested that users of Internet Explorer have a lower IQ than people who chose other browsers appears to have been an elaborate hoax. A number of media organisations, including the BBC, reported on the research, put out by Canadian ...


28

No: these news are not credible at all. The report was investigated by Daily Edge and found to be unreliable for two reasons: it was traced to a single source, Sinembargo.mx and of course this makes the claim unverifiable by skeptical standards. The source for all the stories appears to be this story from June 1 on Sinembargo, a Mexican online news site....


25

The Scientific Consensus: No evidence they reduce cognitive decline In October 2014, a consensus statement was produced that rejected the key claims about brain games. The list of signatories include Susanne Jaeggi, Michael Kane, Randy Engle, Hal Pashler and a number of other people who can be considered eminent in this field (and who you'll find cited ...


25

Short answer: YES, it is surprising, but it is true. Based on existing answers and comments, there seems to be some confusion, so let's start by clarifying: This question is not about whether we were smarter/faster in Victorian times. It is not about 120 year old data. This question is not about how quickly people answered questions. It is how quickly they ...


24

Conclusion: Although the world as a whole has seen a positive Flynn effect in the past few decades, there have been multiple studies that show a negative Flynn effect in a few places. Dutton and Lynn are real scientists who wrote several of these studies. The scientific community appears to accept their basic finding, i.e. that the negative Flynn effect ...


22

There is a correlation between IQ and myopia (near-sightedness). I believe Arthur Jensen was the first to explore the link. Here is a newer open-source article on the topic, though there are many more. The correlation also holds within families, and is apparently not related to reading books: After controlling for age, gender, school, parental myopia, ...


21

A lot of the discussion on this topic was provoked by a peer-reviewed study published in 2012. Quoting from the abstract: We proposed and tested mediation models in which lower cognitive ability predicts greater prejudice, an effect mediated through the endorsement of right-wing ideologies (social conservatism, right-wing authoritarianism) and low ...


20

The simple answer is: no they don't Andrew Gelman has addressed this issue several times in his blog and his book Red State, Blue State, also has a lot of related electoral statistics. In responding to statements like this (in William Saletan's review of Jonathan Haidt's book, The Righteous Mind), my emphasis : You’re smart. You’re liberal. You’re well ...


20

Birth order does not influence IQ but social rank in the family does. Birth order is not associated with intelligence in between-family data once the number of siblings is statistically controlled. The analyses support the admixture hypothesis, which avers that the apparent birth-order effect on intelligence is an artifact of family size, and cast doubt ...


20

I think James Watson's claim is that there is a difference, and that that difference is caused by genetics. The quoted claim includes: inherently gloomy about the prospect of Africa people wanted to believe that everyone was born with equal intelligence His claim appears to be contrary to current summaries on the matter, for which Wikipedia ...


19

This answer has three sections: Is human intelligence declining? No. Is the genetic foundation of human intelligence eroding? This has not been shown. Are other factors influencing the genetic component of intelligence? Probably. Is intelligence declining? No, human intelligence is not declining. In fact, it is increasing. This is actually stated in the ...


18

From Eric H. Chudler (University of Washington): There are 3 published scientific studies that have examined Einstein's brain. 1) On the brain of a scientist: Albert Einstein (1985) The scientists counted the number of neurons (nerve cells) and glial cells in four areas of Einstein's brain: area 9 of the cerebral cortex on the right and left ...


18

There is an important point about the concentration of fluoride that Mercola doesn't address. The concentration of fluoride intentionally added to water in the US is according to the EPA between 0.7 - 1.2mg/L: Optimally fluoridated community water systems add fluoride to a level between 0.7 – 1.2mg/L. Fluoride is sometimes naturally present in water ...


18

It's frequently quoted, this seems to be the main research used: Sex differences in mental test scores, variability, and numbers of high-scoring individuals. Hedges LV, Nowell A. Science. 1995 Jul 7;269(5220). From the abstract: "...the test scores of males consistently have larger variance"


17

Short answer: If you measure IQs, taller people tend to show higher numbers, and men are taller in average. A man and a woman of the same size would show a slight difference in favour of the female. If measuring intelligence as brain components, men show slightly higher numbers and have a better short-term memory. Adam Hampshire from the University of ...


17

Since the original article wasn't mentioned in the question, here's a link with abstract: MEIER MH, et. al. Persistent cannabis users show neuropsychological decline from childhood to midlife. Proc Natl Acad Sci U S A. 2012 Oct 2;109(40):E2657-64. doi: 10.1073/pnas.1206820109. Epub 2012 Aug 27. The purpose of the study, published in Proceedings of the ...


17

This behavior has been well documented in Japanese crows, but Cristol et al (the contradicting paper in the question) did not observe it in American crows. This Ph.D. dissertation discusses the findings of Cristol, as well as another paper by Nihei which documented the behavior in Japanese crows. While [Cristol et al.] are careful to note that they ...


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