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Notes -
I can articulate the belief again, sure. To wit:
Humans are animals like any other, with populations evolving divergently under local selection pressures by all normal evolutionary mechanisms. An important difference is that past some distant point, human cultures have began exerting even more pressure than the natural environment; so environmental cues, founder effects, cultural choices and historical-political circumstances have determined path-dependent evolutionary tracks of our groups. Relative fitness tradeoffs, and thus selection pressures, differ between populations, although the requirements inherent to having human society constrain them some; societies are just very different. For example, all healthy humans can learn to speak some language, use abstract concepts, do different jobs. Yet populations which form big settled communities with labor specialization, and practice technologically demanding agriculture in cold climates with clear seasonality that rewards long-term orientation, experience pressures unlike that of nomadic groups or foragers near equator; on all levels from biochemistry to metabolic constants to skeleton proportions to prevalent temperaments to, yes, average level of general intelligence.
Human evolution is counterintuitively fast, even without some explicit eugenics or strong bottlenecks – groups can diverge on a trait by 1 SD in thousands of years, under mundane pressures like whether a tribe practices diving or not. This happens mainly through the change in distributions of already present alleles, not novel mutations (though we also accumulate novel mutations increasingly quickly, due to population size explosion; contra popular anthropological myth, human evolution accelerates in historical time, we are all genetically very different from «anatomically modern humans» of 200 KYA or even «behaviorally modern humans» of 50KYA).
Stable individual traits, including value-laden like intelligence, are influenced by heredity and environment. It is not very meaningful to say that a trait is more influenced by one or another in some general sense. But there are reaction norms that, for value-laden complex traits, tend to resemble logarithmic curves with regard to environmental gradient: positive environmental contributions at some point effectively plateau, and remaining variance is dominated by genetics. The corollary of this is that as the median environmental quality increases, heritability of traits increases too, even in societies with significant inequality, until only small extremes are dominated by effects of nurture. In the developed world, environmental inputs are satisfied to such an extent that intelligence is roughly 80% heritable and this doesn't much or at all (there's some debate about «Scarr-Rowe effect») differ between social strata.
There's a strong political commitment to understate the progress in environmental conditions and overstate effects of economic inequality on ability, which together with American history of race relations and a few other contingent political factors makes people deny all that and suppress this knowledge institutionally.
but since you've read Murray you must already know the core thesis. There are plenty of other digestible intros from self-awowed HBDists: Sailer, Jayman 1 and 2, even some links in this library. The problem begins at the level of arguing finer empirical and methodological points, it quickly devolves into this kind of abstruse stuff
Thanks, this is a cogent summary with plenty to explore. It was cheeky of me to prompt it because of course it's possible for me to do my own hunt. There are some things I've never come across here such as reaction norms so all well and good for learning something new.
But as you say rests on finer empirical points. I found what I read of Murray (not the bell curve but a later one that talked about gender as well) that it was already making inferences at the higher level and didn't have enough of the detail underneath. Of course at that level it's rapidly overwhelming, but it's where potentially false assumptions could be exposed.
Broadly speaking I don't think the universe is necessarily going to line up with progressive wishes but I'd need to understand more to get a view on the robustness of HBD.
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