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naraburns  nihil supernum  1yr ago (text post)   32050 thread views

Culture War Roundup for the week of October 31, 2022

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A few days ago, I made a comment defending Turkheimer and critizing HBDers, in response to a vaulted "best of" comment dismissing Turkheimer. One of the main things my comment centered on was the phenotypic null hypothesis, which can roughly speaking be summarized as "correlation does not imply confounding" + "causation does not imply unmediated and unmoderated causation". Or as I phrased it:

Put simply, the phenotypic null hypothesis is this: Heritability tells you that if you go up through the chain of causation, then you will often end up with genes. However, there may be many ways that variables can be connected to each other, and there’s no particular reason to expect that every step along the chain of causation from genes to outcomes is best thought of as biological.

The consensus claimed that this was well-understood by HBDers around here, and perhaps even by HBDers more generally. Now I don't know that I buy that because it really doesn't seem well-understood in many places other than with people around Turkheimer.

In the thread, one person ended up posting an example of a paper which supposedly understood the nuances I was talking about. However, I disagree with that, and think that it is instead an excellent example of the problems with HBD epistemics. For instance, the paper opens by saying that the goal is to test evolutionary psychology hypotheses by testing for heritability in some personality traits:

According to the recent evolutionary-inspired theories (i.e., differential susceptibility [1], biological sensitivity to context [2]), humans, like many other species [3], differ substantially in their sensitivity to contextual factors, with some more susceptible to environmental influences than others. Importantly, these theories suggest that heightened sensitivity predicts both the reactivity to adverse contexts as well as the propensity to benefit from supportive features of positive environments. In other words, sensitivity is proposed to influence the impact of environmental influences in a “for better and for worse” manner [4]. These prominent theories converge on the proposition that genetic factors play a significant role in individual differences in Environmental Sensitivity (ES) [1, 2, 5].

Now, if you don't appreciate the phenotypic null hypothesis, then this would probably seem like a reasonable or even excellent idea. Evolution is about how genes are selected based on the traits they produce; if something is genetically coded, then evolution must have produced it, and conversely if evolution has produced it then it must be genetic.

But if you appreciate the phenotypic null hypothesis, then this study is of minimal relevance, almost no evidentiary value, and perhaps even eye-rollingly stupid. Of course the scales you administer are going to be heritable, because pretty much everything is heritable. Heritability doesn't mean that you've got anything meaningfully biological.

Now the thing is, my impression is that behavior geneticists do this sort of nonsense all the time, and that HBDers take them seriously when they do it. If HBDers instead properly appreciated the phenotypic null hypothesis, they would look somewhere else for this sort of info, or maybe even fix behavior genetics by propagating the info backwards to HBD-sympathetic behavior geneticists that they should read more Turkheimer. Notably, since this study was suggested as exemplary by someone here on TheMotte, it seems to provide at least an existence proof of someone who does not have a proper understanding of the phenotypic null hypothesis.

A few days ago, I made a comment defending Turkheimer and critizing HBDers, in response to a vaulted "best of" comment dismissing Turkheimer. ... In the thread, one person ended up posting an example of a paper which supposedly understood the nuances I was talking about. However, I disagree with that, and think that it is instead an excellent example of the problems with HBD epistemics.

In response to your comment, @DaseindustriesLtd already shared proof that Turkheimer confessed to being epistemically irrational about HBD:

And because whatever the faults of HBDers, the other side remains epistemologically worse. Turkheimer may have some legitimate scientific argument against between-group genetic diffs on g; his bottom line was still arrived at through moralizing. «We can recognize a contention that Chinese people are genetically predisposed to be better table tennis players than Africans as silly, and the contention that they are smarter than Africans as ugly, because it is a matter of ethical principle that individual and cultural accomplishment is not tied to the genes in the same way as the appearance of our hair.»

You did not respond to that allegation. Why should we waste time sorting through the pilpul of a confessed propagandist if we are in any way interested in epistemics, as you purport to be?

Let me also cut through what feels like a lot of unnecessary argumentation and simply ask you this: how can you explain the correlation between cognitive skills and genetic closeness depicted in this figure without acknowledging substantial genetic heritability? How is any sort of null hypothesis even necessary with this kind of direct evidence in hand?

Let me also cut through what feels like a lot of unnecessary argumentation and simply ask you this: how can you explain the correlation between cognitive skills and genetic closeness depicted in this figure without acknowledging substantial genetic heritability?

Yes, when you control for factors X, Y and Z, whatever remains is going to be what shows up on the graph. That is what "controlling for" means. Where HBD-tards drop the ball is the transition form "things like height, athletics ability, show high degrees of heritability" to "judging people by their individual qualities rather than their race is anti-science"

  • -25

Where HBD-tards drop the ball is the transition form "things like height, athletics ability, show high degrees of heritability" to "judging people by their individual qualities rather than their race is anti-science"

That wasn't remotely the topic of conversation.

The answer is the same though.

  • -15

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