Published online by Cambridge University Press: 01 February 2018
For several decades, research has documented large differences in the results of cognitive ability tests – large differences between generations and between countries. Whether these differences reflect real cognitive ability differences is still a contentious issue. We document the results and give evidence for an interpretation of them as real world differences: they are backed by further statistical indicators of cognitive achievement and by comparisons with everyday life experiences in different regions of the world.
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