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Comment by andy_ppp | Hacker News Reader

Presumably the only good data can come from siblings who were raised in environments dramatically different from each other and the ended up with similar IQs? It must be extremely hard to know what factors in the environment might contribute to IQ... saying the data is great sure, but I need examples of how environmental factors are removed.

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Go look up eg the sources on the wiki article, and you can see for yourself how they controlled for nurture.

I looked into it and the actual answer as with everything it’s extremely complicated and you’re original pithy 80% of IQ is heritable seems to be dependent on how much culture is involved in the testing methodology... https://blogs.scientificamerican.com/beautiful-minds/the-her...

I think the idea that we can control properly is extremely unlikely and IQ will turn out to be a lot difficult to extract from learning/society/environment than you might think, especially as findings with epigenetics and intelligence start to be shown. https://www.europeanscientist.com/en/research/epigenetics-an...

Your first link is a blogpost about someone's doctoral dissertation, and your second link is even more of a stretch (the title of the paper ends with a question mark). That is fringe research, and not the established position. You get what you search for.

As for cultural loading in intelligence tests, maybe you could expand on that? How do you measure how much culture was involved in the methodology, and how it affected the results of the tests?

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