[AlexC04]

> First, we have culture fair IQ tests. Raven's Progressive Matrices is entirely symbolic: > https://en.wikipedia.org/wiki/Raven%27s_Progressive_Matrices.... very hard to see how it could be culturally biased, and if it is, why do Europeans do so poorly compared to Chinese and Japanese people?

So one hypothesis is that the test is unbiased and that Chinese & Japanese people have a higher IQ than Europeans?

Perhaps another hypothesis is that Kanji based languages with a high number of glyphs and characters gives a lifetime of practice to Chinese and Japanese people who are then more adept amd practised at specially rotating random or nonsense glyphs.

While the Ashkenazi Jews' IQ differences are interesting, your conclusions remain spurious and based on correlation & epidemiology.

One of the studies you cite for example examines a cohort of Jews who settles in Britain from Germany between 1908 and 1940. Wealth and connections could account for a massive "selection bias"

Additionally "high caste Indian" would also speak to other possible confounding variables.

For example: a very high socioeconomic status appears to be a common thread to all your examples which don't point to race as the dependent variable.

It's all interesting, but I'm not sure the interpretation you're presenting really stands up.

[Moshe_Silnorin]

Raven's Progressive Matrices aren't really based on spacial rotation, but an interesting point. One thing we might look for to test this idea would be Raven's Matrices tests of illiterate Chinese farmers. They were developed in the late 30s, so it's possible such studies were done. Though we'd need to be wary of the Flynn effect.

We see similar IQ differences in Ashkenazi immigrants to America and Canada, and these differences have persisted over multiple generations. You would expect regression to the mean if it is purely a selection effect. Also, selection effects can't explain 27% of United States Nobel prize winners in the 20th century, 25% of Fields Medal winners, and 25% of ACM Turing Award winners, for obvious reasons. 10x overrepresentation isn't something selective immigration can explain when the the global Ashkenazi population is so small.

Wealth is tied with cognitive ability. Look at Jewish immigrants in the 1930s, most of them were extremely poor, but their children grew up to be disproportionately successful. Most people desire wealth. Intelligence is your ability to realize your desires. Intelligent people will tend to acquire more wealth than less intelligent people. As intelligence is highly heritable, this has class implications that can't be ignored.

[telotortium]

Regarding Progressive Matrices, you could try comparing Japanese and Chinese, who use kanji; Koreans, who use hangul, which is derived from kanji; and Vietnamese, who use the Latin alphabet (albeit with a lot of diacritics).