AN INCREASE OF INTELLIGENCE IN SUDAN, 1987–2007

Omar Khaleefa · Afra Sulman Mohammed Sulman · Richard Lynn

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Cognitive Abilities and Testing Economic Growth and Productivity Intergenerational and Educational Inequality Studies

Abstract

Results are reported for mean IQs on the WAIS-R in Sudan in 1987 and 2007. There was a gain of 4.05 Full Scale IQ points over the 20-year period, representing a gain of 2.05 IQ points a decade. The Verbal IQ showed a loss of 1.65 IQ points, while the Performance IQ showed a gain of 7.2 IQ points. These results are broadly consistent with those in economically developed countries in showing that mean IQ on the WAIS-R has increased in Sudan, and the Performance IQ has increased more than the Verbal IQ.

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References

1955Manual for the Wechsler Adult Intelligence Scale.1996Monitoring the world economy, 1820-1992 1987Massive IQ gains in 14 nations: What IQ tests really measure.2012What Is Intelligence?: Beyond the Flynn Effect 1982IQ in Japan and the United States shows a growing disparity 1948Soldier intelligence in World Wars I and II.2003IQ on the Rise 1950THE TREND OF SCOTTISH INTELLIGENCE

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2012Intelligence: New findings and theoretical developments.

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