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Comment by chrisco255 | Hacker News Reader

There's no evidence that people with higher IQs have more children than the middle and lower spectrums of IQ though. There was no survival pressure any time in the past 100 years that would explain it.

As for Jewish population having generally higher IQ, there must have been some far more dire population pressure beyond memorizing the Torah to explain the significant difference compared with other modern populations.

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>As for Jewish population having generally higher IQ, there must have been some far more dire population pressure beyond memorizing the Torah to explain the significant difference compared with other modern populations.

There actually is a body of research trying to explore this question, e.g.: https://pubmed.ncbi.nlm.nih.gov/16867211/

I think the point is that we don't observe evolution here, i.e. people with lesser IQ die more or reproduce less, but cultural adaptation. If high IQ scores are considered valuable, society creates environments that enable high IQ scores. Brains are pretty adaptable, even more so in the first 25 live years, and long exposure to an environment training for high IQ scores will result in higher IQ scores.

Correct (at least insofar as that's the assertion I'm making).

You're implying that the reason for the increase in IQ scores is the result of society suddenly focusing more on educational outcomes, but I think you're wrong about that. Society's ideas about childhood education and educational outcomes haven't changed that much over the last 60 years.

It's far more likely that these changes result from more immediate factors like improved teaching methods, improved ideas about health and pedagogy and environmental factors (like the removal of lead from gasoline, etc)

It’s not evolution insofar as the lower IQ scores are dying, but there is sexual selection. Mean reversion is from an approximation that does not hold for the subset of the population that is sexually selecting for intelligence. Two high IQ parents will on average produce offspring that have an even higher IQ.

Cane toads at the front of the cane toad expansion quickly evolve longer legs faster than one would expect if assuming there should be reversion to the mean.

Selection of high IQ women by high IQ men is a more recent phenomenon that has to do with having women in selective education so such pairings are a lot more common than they used to be, and you need both to be selected this way in order to avoid reversion to the mean.

My understanding was that high and low IQ people tend to have fewer children, and in an age of contraception, impulsive people actually have the most.

>There's no evidence that people with higher IQs have more children than the middle and lower spectrums of IQ though. There was no survival pressure any time in the past 100 years that would explain it.

It's true if you focus on the mid-high end of the spectrum, but people with low intelligence have a very hard time adapting to modern society.

Right, but wouldn't that generally mean that IQs remain static (if evolutionary pressure is the only influence)?

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