110

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 ...


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 summary ...


42

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 must ...


37

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; ...


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 ...


35

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% ...


29

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). The ...


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 ...


25

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 ...


23

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 ...


21

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 ...


21

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 ...


21

The referenced study is here: Gordon Hodson and Michael A. Busser, "Bright Minds and Dark Attitudes: Lower Cognitive Ability Predicts Greater Prejudice Through Right-Wing Ideology and Low Intergroup Contact". Psych Science 2012. User March Ho also linked to a pdf. This is a real study in a respected journal, so I'll give them the benefit of the doubt that ...


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 on ...


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 ...


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 ...


15

This question sent me down the rabbit hole, chasing incredibly bad references at Google Ngram, Google Books, and Google Scholar. Some notable supposedly early references that use the word meritocracy or meritocratic (listed from supposedly oldest to newest): Household Words edited by Charles Dickens. In Household Words number 84 (volume IV, page 142), the ...


15

The lawsuit reported on by ABC News did happen (Robert Jordan vs. the City of New London, CT). The court case can be found here. That page verifies many of the facts given in the article, including the conclusion: it was ruled constitutional to not hire someone as a police officer because they scored too highly on an intelligence test (The test used in this ...


14

Evidence: The tests given to Koko the gorilla were Cattell Infant Intelligence Scale, Peabody Picture Vocabulary Test, Ravens Progressive Matrices and Wechsler Preschool and Primary Scale of Intelligence. Chapter 14 of this document gives a description of those IQ tests. Research also showed that Koko was able to demonstrate some of the techniques required ...


12

I cannot answer about the UK and Ireland specifically, but the data presented there is not reliable. It comes from books by Lynn and Vanhanen, that have been heavily criticized by other scientists. The summary given by Brainstats is subtly wrong; Lynn and Vanhanen did not "conduct" the IQ studies in different countries, they reviewed studies done by other ...


11

I found the following study on chess and intelligence: Does chess need intelligence? — A study with young chess players The study claims that intelligence was not a significant factor in chess skill, and that if anything, intelligence correlated negatively with chess skill. When an elite subsample of 23 children was tested, it turned out that ...


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