The history of the race and intelligence controversy concerns the historical development of a debate, concerning possible explanations of group differences encountered in the study of race and intelligence. Although it has never been disputed that there are systematic differences between average scores in IQ tests of different population groups, sometimes called "racial IQ gaps", there has been no agreement on whether this is mainly due to environmental and cultural factors, or whether some inherent genetic factor is at play.
In the late nineteenth and early twentieth century, group differences in intelligence were assumed to be due to race and, apart from intelligence tests, research relied on measurements such as brain size or reaction times. By the mid-1930s most psychologists had adopted the view that environmental and cultural factors played a dominant role. In 1969 the educational psychologist Arthur Jensen published a long article reviving the older hereditarian point of view, with the suggestion that there might be genetic reasons why compensatory education had failed. His work, publicized by the Nobel laureate William Shockley, sparked controversy amongst the academic community and even led to student unrest. A similar debate amongst academics followed the publication in 1994 of The Bell Curve by Richard Herrnstein and Charles Murray. They argued in favor of the hereditarian viewpoint. It not only provoked the publication of several interdisciplinary books on the environmental point of view, some in popular science, but also led to a report from the American Psychological Association that found no adequate explanation for the observed differences between average IQ scores of racial groups—none conclusive for a cultural explanation, and even less for a genetic interpretation.
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