from m. saadat:

“It has been reported that offspring of consanguineous marriages have lower IQ scores than offspring of non-consanguineous marriages. The present result is consistent with that report. However, this study is the first to test the hypothesis that IQ and α are negatively correlated at the population level…. Across countries, there was a significant negative correlation between IQs and logα (r = −0.765, df = 33, p<0.001).”

here’s a table from that article. that second figure is the inbreeding coefficient (“the probability that an individual has received both alleles of a pair from an identical ancestor”) for each population:

and here’s a little chart i made (using saadat’s numbers) illustrating the negative correlation between inbreeding and national iqs:

so … there you go.

see also: Inbreeding depression and IQ in a study of 72 countries

previously: kissin’ cousins

(note: comments do not require an email.)