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Culture War Roundup for the week of February 19, 2024

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This is just an arrogant demand to close ones eyes.

Human biodiversity is actually pretty low - Homo sapiens has been through a number of bottlenecks and when compared to other species, such as our closest relatives like chimpanzees, we'd look like inbreeds.

And yet you can look at a man with purely sub-Saharan African ancestry and one with purely Scandinavian ancestry for at least several millennia, and you will be able to tell the difference.

Human migrations over the last thousand years have been such that literally everyone on Earth is a descendant of literally everyone that lived 7000 years ago whose offspring didn't die out. This is known as the Identical Ancestors Point (google it) and it's pretty uncontroversial if unintuitive.

I checked Wikipedia.

In 2004, Rohde, Olson and Chang showed through simulations that, given the false assumption of random mate choice without geographic barriers, the Identical Ancestors Point for all humans would be surprisingly recent, on the order of 5,000-15,000 years ago.

Emphasis mine.

Furthermore:

However, people will vary widely in how much ancestry and genes they inherit from each ancestor, which will cause them to have very different genotypes and phenotypes.

and

Note that a person in the population today does not necessarily inherit any genetic material from a given ancestor at the Identical Ancestors Point.

So we can reject a 7000-year-ago Identical Ancestors Point as being both wholly unproven and irrelevant even if true.

Africans have more genetic diversity than literally every other ethnicity on earth taken together, so any classification that separates "Africans" from other groups is going to be suspect.

This is simply a non sequitur, though I will note that the usual separation is "sub-Saharan Africa", not Africa as a whole.

Race isn't a valid construct, genetically speaking. It's not well defined; even HBD proponents disagree on how to classify people beyond Blacks/Whites/Asians.

This is just blowing smoke. And the discovery that self-reported race can be robustly predicted from medical images, with many different modalities, demonstrates that race is physical. Race may sometimes be hard to categorize, but there's a real thing there and we've at least done an OK job of categorizing it.

Intelligence is not well-defined and not construct valid

Construct validity is a property of a measurement, not of the thing measured.

IQ has a number of flaws that would make anyone outside the field of psychology not touch it with a ten foot pole. For starters, it is by definition Gaussian for no apparent reason. The g construct itself has no neurological basis and is purely an artifact of factor analysis.

It's Gaussian because studies done by Terman and others based on the IQ of children using earlier tests (which were not forced to a Gaussian) came out reasonably close to Gaussian. And yes, g is an output of factor analysis, though whether it is a mere artifact or not is not known -- claiming it to be a mere artifact is simply assuming away its relevance. Anyway, for this and the previous claim to be able to debunk HBD, you have to reject the concept that some people are more intelligent than others and that we have ways of measuring that. Without that, you haven't debunked HBD, you're just complaining about the crudity of the tools.

There's no single genetic explanation that was ever put forward to account for traits purported to be "genetic" in origin by HBD proponents. This is because HBD proponents do not care about genes, and because they do not know about anything related to genetic mechanisms. Epistasis alone fucks up many behavioral genetics models and this is just scratching the surface of the complexity involved.

I'm pretty sure HBD proponents do care about genes. But just because determining the actual mechanisms behind HBD is difficult doesn't mean HBD is false; it's not even evidence for the proposal. Mendel didn't know shit about DNA either.

Heritability does not imply genetic determinism.

Non sequitur

Literally every public HBD proponent operates outside academia and is virtually unknown in the genomics community.

Yes, this just means HBD is anathema, not that it's wrong.

Literally anyone who's been working on HBD stuff has been receiving funding from shady organizations

Ditto, even if true.

Many public HBD figures have been found guilty of fraud.

Even if true, fraudulent evidence for a proposition is not evidence against it.

None of this erases e.g. the difference in various standardized test scores between black and white Americans, nor demonstrates a non-heritable (or even heritable non-genetic) explanation for them.