James Flynn of Flynn effect fame is one of the authors of the paper, which makes the weakness of the conclusions all the more surprising. We've got paper showin

James Flynn of Flynn effect fame is one of the authors of the paper, which makes the weakness of the conclusions all the more surprising. We've got paper showing rises in scores in the US, falls in Scandinavia and a sharp rise and fall over the space of of dozen years in Estonian boys and we're worrying about the possibility of 'dysgenic mating' and loss of those capable of higher level deductive reasoning abilities and not just concluding that comparing different cohorts taking the test isn't telling us very much? The most logical conclusion of the data presented in paper is that the test results is unstable between dissimilar environments to the extent we shouldn't really bother using it for comparisons between populations (as opposed to an extremely crude measure of relative abilities within a cohort, where it is generally better than other crude proxies for actual human capability), still less mourning real world losses of reasoning ability. Tbh I thought doubting the tests was the page Flynn was already on.