A couple of days ago, I summarized Lord Baron King-Man Michael Woodley of Menie’s description of Holocene eugenics like so:
tl;dr- Human genetic intelligence has been trending upward for 10,000 years or so, probably due to the positive feedback effect of navigating and creating increasingly complex cultures, and statistically we can be pretty certain of this.
Previously, I’ve used a very simple argument in favor of the theory that neanderthal genetics are the primary predictive factor in modern genotypic IQs. The argument says that because population-level neanderthal admixture is correlated with genetic intelligence, and genetic intelligence is distribited across many genes, then historical selection for intelligence would almost certainly entail selection for neanderthal admixture. The premise and the conclusion of this argument could be sound, but the simple correlation argument itself is invalid. Neanderthal genetics have been selected against during the same time period as this selection in favor of intelligence.
We could expect some kind of bias in the selection pressures where, for example, only the neanderthal genes associated with mathematical aptitude are favored and those associated with low general personality factor are disfavored, but this is no longer an appeal to simple correlation. This is similar to the argument that right-wing people do not have lower IQs than left-wingers, despite their underaccomishment in academia, which can be more or less predicted by genetic intelligence.