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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.

So here's a question. Can you illustrate specific testable predictions of both theories, and some experiments/measurements in which these predictions differ?

Concretely I'm asking for something like:

Experiment setup: ???

HBD prediction: X

HNU (Human Neural Uniformity) prediction: Y

X != Y

I'm asking because I vaguely recall some conversations during the ban on mentioning HBD (some years back) during which "systemic racism" was constructed as a theory which made identical predictions to HBD. Specifically, it's a force that causes Asians to excel, blacks to underperform, whites to give middling performance, and also it can't be directly measured by any methods in the social sciences.

What is "human neural uniformity"?

It's probably a modification of a moldbug neologism, "Human neurological uniformnity", from a gentle introduction p. 3. It just means - 'human intelligence and psychological traits are evenly distributed across races, no significant inter-race differences'.

But human neural uniformity sounds like a dumb and baseless theory.