Letter | Published:

IQ in Japan and the United States shows a growing disparity


Evidence from 27 samples indicates that the mean IQ in Japan is higher than in the United States by around one-third to two-thirds of a standard deviation. Analysis of results from the standardization in Japan in 1975 of the new revised version of the American Wechsler Intelligence Scale for Children shows that the Japanese–American disparity in mean IQ has increased during the twentieth century. Among the younger generation the mean Japanese IQ is approximately 111.

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