Black/white IQ differences

Flynn People have often attributed to me the idea that the causes of generational differences in IQ must be similar to the causes of black/white IQ differences. I have never at any time said that. I have never said that IQ gains over time shows the black/white IQ gap to be environmental. Although, even if the causes are different, they do make an environmental hypothesis more plausible, for reasons that would take us far afield. Note in Table 3, that the correlation between IQ gains and the black/white IQ differences is relatively low it is 0.21.1 have never thought there is a commonality of causality there. I don t think that Chinese/white IQ differences are caused by the same thing as Filipino/Chinese IQ differences. It would seem to me quite bizarre if all these group IQ differences had a common cause. 

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