Nearly three decades ago, work by James R. Flynn revealed that average IQ scores in developed countries were rising at a stunning pace, of the order of 0.3 points per year or more. Later work showed similar explosive gains in developing countries and that the rise (now dubbed ‘the Flynn effect’) is still continuing. How did he find this? Recall that although IQ tests themselves have changed over time, each revision requires the IQ scores to be normed to always have an average value of 100. So does someone who scores 100 today have the same IQ of someone who scored 100 say fifty years ago, since they took different tests? Flynn found that if you give people today old IQ tests, their scores rose steadily the older the tests, suggesting that IQ tests have got harder over time. (James R. Flynn, Are We Getting Smarter?, 2012) [Read more…]