We don’t know if the Flynn effect is real, it might just come from measurement errors arising from people becoming more familiar with IQ-like tests, although it also could reflect real gains in g that are being captured by higher IQ scores.
I think the Flynn effect has been pretty solidly established, as well as the fact that it has had a significant effect on g.
I do think the most likely explanation of a large fraction of the effect on g is explained via the other factors I cited above, namely better nutrition and more broadly better health-care, resulting in significantly fewer deficiencies.
I think the Flynn effect has been pretty solidly established, as well as the fact that it has had a significant effect on g.
I do think the most likely explanation of a large fraction of the effect on g is explained via the other factors I cited above, namely better nutrition and more broadly better health-care, resulting in significantly fewer deficiencies.