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Lucky Hunter and Corn Mother's avatar

Turkheimer picks the weirdest examples for his slippery slope fallacies. "The IQ gap is just the one that we’re used to talking about. But Japanese people are more introverted on personality measures than Americans are — and so is that on the table now?"

Sure, why not? I can imagine a possible world in which this difference is purely genetic, and I can imagine a possible world in which this difference is purely environmental, as well as various degrees of intermediate causation. Importantly, these different possible worlds do not look exactly the same. You could study this using a variety of methods: polygenic scores, adoption studies, admixture studies, and comparisons of descendant groups living in different countries. If you did all that, it would probably give you a better idea about what is actually true about the world, whichever explanation it is. (For what it's worth, I'm convinced there are pretty large cultural effects on East Asian-European introversion differences, regardless of whether or not there is also a genetic component. The Asians and Asian-Americans I've known have often had quite different personalities. If you walk around a large city or university campus in the US, you can look at ethnically Asian people from a distance and quite often guess correctly whether they will have a foreign or American accent before you can hear their voices. The clothes are different on average, but so are the facial expressions, body postures, etc. Those who grew up in America have a more socially open demeanor.)

I remember at some point seeing Turkheimer claim that research on genetic population differences in IQ was bad because: oh no, what if someone tried to make the same claim about population differences in alcoholism being genetic? From my perspective, why wouldn't we want to know that? A drink or two socially is fun. Alcohol addiction ruins your life and the lives of those around you. Twin studies indicate there is a strong genetic component to someone's risk of alcoholism. Isn't it better if individuals can get genetic tests and know what their risk is? Isn't it better if certain populations can know that, on average, they are at higher risk for alcoholism? If there are no genetic differences in this trait between populations, then we can study the environmental factors that cause it to vary. Maybe figure out how we can shape our environments to be more like the French and Italians, who drink plenty but rarely seem to get addicted. But if, say, Native Americans have a much higher risk of alcoholism than Italians, then telling them they just need to drink like Italians will not be doing them any favors. If they replicate the same environment exactly, they'll still have different results. Alcoholism can lead to cirrhosis, cancer, car accidents, domestic violence, criminal records, and birth defects. Fortunately, the genetics of alcoholism risk presents an easy gene-environment interaction: if you never start drinking, you won't get addicted. Why on earth wouldn't we want accurate information about people's genetic propensity for alcoholism, both at the individual and population level, so they can make informed choices?

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Vasubandhu89's avatar

This seems like only slightly better than the usual slop. As is typically the case with this genre, the author mostly refuses to engage with the actual arguments and evidence of the people he's writing about.

But I did learn some new things. For example, I learned that Sophie von Stumm is "very torn" about being at the same conference with some hereditarians. That's disappointing - I thought she would be more chill. Kudos, though, to James Lee for refusing to participate in this farce.

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