In the 1940s, Smith and Tuddenham independently noticed and reported that IQ test scores were rising over time. The phenomenon did not draw much attention at the time and was idle until Lynn and then Flynn independently rediscovered and reported it in the early 1980s. When The Bell Curve was published, Herrnstein and Murray named [...]
Here is a new updated table of correlations that were observed between the Jouve-Cerebrals Crystallized Educational Scale (JCCES) and other measures of cognitive abilities or achievement.
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