A group of psychologists, two from Northwestern University and the third from the University of Oregon, has found via online testing that IQ scores in the U.S. may be dropping for the first time in nearly a century. In their paper published in the journal Intelligence, Elizabeth Dworak, William Revelle and David Condon describe analyzing the results of online IQ tests taken by volunteers over the years 2006 to 2018.
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Source: Phys.org