Where did the 55 IQ estimate for 50 kya come from? It didn't jump out at me when I looked at the paper (which, admittedly, I didn't read as scrupulously as I should have).
From Figure 4. WHG are the gold dot, that is 3SD below the mean. I used it as a rough proxy, though it's not clear how well polygenic score differences extend to phenotypic ones.
John Fuerst also made these drift-related arguments. By drift alone, one expects some genetic differences in phenotypic values between separated groups in random directions. Strict equality is not a thing unless there's the exact same stabilizing selection across time and place. Basically impossible. The question is not really whether there are some gaps, there must be for any phenotype, but the size of these.
By the way, you cannot just assume that PGS gaps of 1 SD correspond to 1 SD IQ gap, or in any other phenotype. The scaling functions are not known.
Probably the direct conversion of polygenic scores to phenotype will have some errors, but it still works in my opinion.
For example, when you convert Aboriginal people's PGS to IQ, it is very similar to their measured intelligence.
I think the biggest mismatch is for Africans, but if you consider that, for example, blacks in Brazil also have an IQ of 71, then you reach another conclusion:
Perhaps African Americans have been able to outperform their genotype only because of a very favorable environment.
In this case, the only people whose scores are really less compatible with the phenotype are probably a part of the West Asian people, such as the Hazara people with a lot of Mongolian descent and a high PGS but a bad phenotype due to the very harsh environmental conditions in Afghanistan and Pakistan.
Where did the 55 IQ estimate for 50 kya come from? It didn't jump out at me when I looked at the paper (which, admittedly, I didn't read as scrupulously as I should have).
From Figure 4. WHG are the gold dot, that is 3SD below the mean. I used it as a rough proxy, though it's not clear how well polygenic score differences extend to phenotypic ones.
https://www.biorxiv.org/content/10.1101/2024.09.14.613021v1.full
John Fuerst also made these drift-related arguments. By drift alone, one expects some genetic differences in phenotypic values between separated groups in random directions. Strict equality is not a thing unless there's the exact same stabilizing selection across time and place. Basically impossible. The question is not really whether there are some gaps, there must be for any phenotype, but the size of these.
By the way, you cannot just assume that PGS gaps of 1 SD correspond to 1 SD IQ gap, or in any other phenotype. The scaling functions are not known.
Probably the direct conversion of polygenic scores to phenotype will have some errors, but it still works in my opinion.
For example, when you convert Aboriginal people's PGS to IQ, it is very similar to their measured intelligence.
I think the biggest mismatch is for Africans, but if you consider that, for example, blacks in Brazil also have an IQ of 71, then you reach another conclusion:
Perhaps African Americans have been able to outperform their genotype only because of a very favorable environment.
In this case, the only people whose scores are really less compatible with the phenotype are probably a part of the West Asian people, such as the Hazara people with a lot of Mongolian descent and a high PGS but a bad phenotype due to the very harsh environmental conditions in Afghanistan and Pakistan.
A French researcher, Franck Ramus, maintains that racial differences in IQ are 0% genetic, which is strictly impossible.
Even if it is proven one day that the differences are lower than expected.
There are even minimal differences of 5 IQ points... On the median.
I’ve seen past studies on IQ PGS of ancient populations suggest that a large deviation in PGS measures up to a smaller deviation in real IQ
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9402434/
Ancient sample with PGS almost 3 SD below the mean is estimated with an IQ of 89
Also, another example of this is Jews scoring over 1 SD above the mean for PGS, but having an IQ of only ~0.66 SD above the mean.
And there is the issue of PGS being less reliable the further back in the past you go, because genes for intelligence presumably change
Are you related to Arthur Jensen?
No.