Thursday, January 2, 2025

Shifts In IQ Over Time

The chart, via Razib Khan, is based upon polygenetic scores calculated based upon ancient DNA. 

7 comments:

neo said...

you believe in iq from dna

Guy said...

Umm, should we believe that the perhaps the most important attribute of homoSap is not under genetic selection? Everyone that has raised kids and seen their grandkids develop knows that intelligence is not equally granted to all. Everything that could be selected for (because there is a phenotypical difference) is by definition selected.

andrew said...

"you believe in iq from dna" yes.

andrew said...

If you really want to get precise about it, what is being selected for is the capacity to have a given IQ in good environmental conditions. Obviously, there are environmental circumstances (e.g. lead exposure) that can prevent people from reaching their potential.

neo said...

i thought you are on the left. the left knows iq disfavors certain races and is a tool for oppression

andrew said...

I am on the left. This doesn't mean that IQ isn't real. It may mean that at a large population level that environmental deprivation can impair people reaching their full potential intellectually. Indeed, there is solid evidence that, e.g., children who test as "gifted" at a young age underperform their potential when they grow up in very bad schools.

Otanes said...

What are the odds that some historical alleles for intelligence are not well-represented in modern populations, and thus the estimates for Mesolithic foragers are low? There may also be newer mutations not present in them. I find it hard to believe that with their greater cranial capacities, all that additional material was or naught. Unless perhaps the modern, moderately high correlation between MRI-measured brain volume and intelligence is an artifact of current evolutionary trends.