Sharon Begley asks, Do School Systems Aggravate Differences In Natural Ability? — because recent studies have demonstrated that mental abilities are not highly malleable or “unstable”; the bright stay bright, and the dull stay dull:
One of the more striking findings comes from the longest follow-up study ever conducted in this field. On June 1, 1932, Scotland had all children born in 1921 and attending school — 87,498 11-year-olds — take a 75-question test on analogies, reading, arithmetic and the like. The goal was to determine the distribution of intellectual ability. In 1998, scientists at the Universities of Edinburgh and Aberdeen tracked down 101 of those students, then 77 years old, and administered the same test.The correlation between scores 66 years apart was a striking .73. (A correlation of 1 would mean no change in rankings; a correlation of .73 is very high.) There is “remarkable stability in individual differences in human intelligence” from childhood to old age, the scientists concluded in a 2000 paper.
In the U.S., two long-running studies also show the durability of relative intelligence. The Early Childhood Longitudinal Study, launched in 1998, tested 22,782 children entering kindergarten. As in the Scottish study, individual differences in mental ability were clear and persistent. In math and reading, when the children were sorted into three groups by ability, ranking stayed mostly the same from kindergarten to the end of the first and third grades. Some gaps actually widened.
The National Education Longitudinal Study tested 24,599 eighth-graders on several subjects, including math and reading comprehension, in 1988 and again two and four years later. “There was a very high correlation between the scores in eighth grade and in 12th grade,” says Thomas Hoffer of the National Opinion Research Center, University of Chicago. Again, rankings hardly budged.