The increase of intelligence in Sudan 1964-2006
Author: Khaleefa, O., Abdelwahid, S. B., Abdulradi, F., Lynn, R.
Source:
Personality and Individual Differences, 45(5), 412-413.
Abstract
Results are reported for mean IQs on the Draw-a-Man Test for 4–10 year olds in Sudan in 1964 and 2006. There was a gain of 12.2 IQ points over the 42 years, representing 2.9 IQ points a decade.