iq   2929

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President Trump believes in IQ tests. He’s not wrong. - The Washington Post
- Stuart J. Ritchie

Most scientists feel a certain nervousness when the topic they research appears in the news. Overstatement is par for the course, misunderstanding a near-inevitability. But what could be more cringe-worthy than the president of the United States engaging in a macho contest with his secretary of state over the area you research? I am, of course, talking about IQ testing: After Rex Tillerson (allegedly) called him a “moron,” President Trump this week suggested that he and Tillerson “compare IQ tests.” Naturally, Trump could “tell you who is going to win.” This isn’t the first time that the president has spoken — and tweeted — about his apparently sky-high IQ.
news  org:rec  current-events  trump  lol  iq  psychometrics  psychology  cog-psych  albion  scitariat  contrarianism  rhetoric  realness  westminster  attaq  truth  intelligence  is-ought 
2 days ago by nhaliday
Alcohol consumption and lifetime change in cognitive ability: a gene × environment interaction study | SpringerLink
We found a significant gene × alcohol consumption interaction on lifetime cognitive change (p = 0.007). Individuals with higher genetic ability to process alcohol showed relative improvements in cognitive ability with more consumption, whereas those with low processing capacity showed a negative relationship between cognitive change and alcohol consumption with more consumption.
study  psychology  cog-psych  psychometrics  iq  metabolic  ethanol  mendel-randomization  endo-exo  GxE  homo-hetero  biodet  behavioral-gen  environmental-effects 
6 days ago by nhaliday
The First Men in the Moon | West Hunter
But what about the future? One generally assumes that space colonists, assuming that there ever are any, will be picked individuals, somewhat like existing astronauts – the best out of hordes of applicants. They’ll be smarter than average, healthier than average, saner than average – and not by just a little.

Since all these traits are significantly heritable, some highly so, we have to expect that their descendants will be different – different above the neck. They’d likely be, on average, smarter than any existing ethnic group. If a Lunar colony really took off, early colonists might account for a disproportionate fraction of the population (just as Puritans do in the US), and the Loonies might continue to have inordinate amounts of the right stuff indefinitely. They’d notice: we’d notice. We’d worry about the Lunar Peril. They’d sneer at deluded groundlings, and talk about the menace from Earth.
Depends on your level of technical expertise. 2 million years ago, settlement of the Eurasian temperate zone was bleeding-edge technology – but it got easier. We can certainly settle the Solar system with near-term technology, if we choose to. And you’re forgetting one of the big payoffs: gafia.
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6 days ago by nhaliday
Why are children in the same family so different from one another? - PubMed - NCBI
- Plomin et al

The article has three goals: (1) To describe quantitative genetic methods and research that lead to the conclusion that nonshared environment is responsible for most environmental variation relevant to psychological development, (2) to discuss specific nonshared environmental influences that have been studied to date, and (3) to consider relationships between nonshared environmental influences and behavioral differences between children in the same family. The reason for presenting this article in BBS is to draw attention to the far-reaching implications of finding that psychologically relevant environmental influences make children in a family different from, not similar to, one another.
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15 days ago by nhaliday
Does Learning to Read Improve Intelligence? A Longitudinal Multivariate Analysis in Identical Twins From Age 7 to 16
Stuart Richie, Bates, Plomin


The variance explained by each path in the diagrams included here can be calculated by squaring its path weight. To take one example, reading differences at age 12 in the model shown in Figure​Figure33 explain 7% of intelligence differences at age 16 (.262). However, since our measures are of differences, they are likely to include substantial amounts of noise: Measurement error may produce spurious differences. To remove this error variance, we can take an estimate of the reliability of the measures (generally high, since our measures are normed, standardized tests), which indicates the variance expected purely by the reliability of the measure, and subtract it from the observed variance between twins in our sample. Correcting for reliability in this way, the effect size estimates are somewhat larger; to take the above example, the reliability-corrected effect size of age 12 reading differences on age 16 intelligence differences is around 13% of the “signal” variance. It should be noted that the age 12 reading differences themselves are influenced by many previous paths from both reading and intelligence, as illustrated in Figure​Figure33.


The present study provided compelling evidence that improvements in reading ability, themselves caused purely by the nonshared environment, may result in improvements in both verbal and nonverbal cognitive ability, and may thus be a factor increasing cognitive diversity within families (Plomin, 2011). These associations are present at least as early as age 7, and are not—to the extent we were able to test this possibility—driven by differences in reading exposure. Since reading is a potentially remediable ability, these findings have implications for reading instruction: Early remediation of reading problems might not only aid in the growth of literacy, but may also improve more general cognitive abilities that are of critical importance across the life span.

Does Reading Cause Later Intelligence? Accounting for Stability in Models of Change:
Results from a state–trait model suggest that reported effects of reading ability on later intelligence may be artifacts of previously uncontrolled factors, both environmental in origin and stable during this developmental period, influencing both constructs throughout development.
study  albion  scitariat  spearhead  psychology  cog-psych  psychometrics  iq  intelligence  eden  language  psych-architecture  longitudinal  twin-study  developmental  environmental-effects  studying  🌞  retrofit  signal-noise  intervention  causation  graphs  graphical-models  flexibility  britain  neuro-nitgrit  effect-size  variance-components  measurement  multi  sequential  time  composition-decomposition  biodet  behavioral-gen  direct-indirect  systematic-ad-hoc  debate  hmm  pdf  piracy  flux-stasis 
16 days ago by nhaliday
Testing the moderation of quantitative gene by environment interactions in unrelated individuals | bioRxiv
We use simulation to estimate the accuracy, power, and type I error rates of our method and to gauge its computational performance, and then apply this method to IQ data measured on 40,172 individuals with whole-genome SNP data from the UK Biobank. We found that the additive genetic variation of IQ tagged by SNPs increases as socioeconomic status (SES) decreases, opposite the direction found by several twin studies conducted in the U.S. on adolescents, but consistent with several studies from Europe and Australia on adults.
study  bio  preprint  biodet  behavioral-gen  genetics  GxE  class  iq  britain  environmental-effects  regularizer  variance-components  correlation  s-factor 
19 days ago by nhaliday
Global determinants of navigation ability | bioRxiv
Using a mobile-based virtual reality navigation task, we measured spatial navigation ability in more than 2.5 million people globally. Using a clustering approach, we find that navigation ability is not smoothly distributed globally but clustered into five distinct yet geographically related groups of countries. Furthermore, the economic wealth of a nation (Gross Domestic Product per capita) was predictive of the average navigation ability of its inhabitants and gender inequality (Gender Gap Index) was predictive of the size of performance difference between males and females.

- Figure 1 has the meat
- gender gap larger in richer/better-performing countries
- Anglo and Nordic countries do best (Finnish supremacy wins the day again)
- surprised China doesn't do better, probably a matter of development
- Singapore is close behind the Anglo-Nords tho
- speculation that practice of orienteering (originally Swedish) may be related to Nords doing well
- somewhat weird pattern wrt age
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4 weeks ago by nhaliday

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