Review by Bruce Bower
IQ scores have risen dramatically over the last few generations. Flynn, a psychologist who discovered this trend 25 years ago, takes a provocative look at what escalating scores mean for the death penalty, racial differences in IQ and other controversial social issues.
Flynn begins by reviewing IQ rises in developed countries. An average Dutch person in 1982, for instance, scored as a near genius relative to the Dutch of 1952. Formal schooling and more complex cultures sparked IQ inflation, Flynn says. Gains occurred largely on test items that gauge the ability to classify things using scientific terms, such as listing dogs and rabbits as mammals, and to use logic to solve hypothetical problems, such as determining how a sequence of abstract shapes will play out.