so, here are regional italian iq scores from lynn based on 2006 pisa scores against the averages of mean inbreeding coefficients for the same regions from 1960-64 (cavalli-sforza, et. al.). correlation is not causation, but i get a negative correlation of 0.85 (-0.85) which is pretty d*mn high.
i know, i know — i’m not comparing the exact same cohorts. but, if you think about it, the comparison is actually between parents and their children. the children are the kids who took the pisa tests in 2006 at age 15 (born in 1991) — and their parents are prolly the children of people who got married in the early 1960s. more-or-less. 1960-64 to 1991 is more like a generation-and-a-half than two generations, but it’s close. and we know that intelligence is in the genes, and we’re talking about families here, so….
like spain, higher iq scores are found to the north in italy, while the farther south you go, the farther south the test scores go. lynn suggests a couple of possible explanations for the differences including latitude and the presence of different populations (both in italy and spain in the medieval period you had germanic peoples settling the northern regions and muslims from north africa and beyond settling in the south). he doesn’t seem to have considered the different degrees of inbreeding between north and south (and possible inbreeding depression) as a potential cause. i’m not saying it’s the only reason behind the different iq scores, but it certainly could be a factor. btw — it was prolly the muslims who introduced strong inbreeding in southern italy as they did in southern spain.
here’s a map of the regions:
here are the data:
and, here are the numbers i used (from cavalli-sforza, et. al.) to get averages of the mean inbreeding coefficients for each region (the averages that i calculated are in bold):
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