Flynn effect
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 James Flynn: Why our IQ levels are higher than our grandparents', (18:41), TED talks
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The Flynn effect is the substantial and long-sustained increase in both fluid and crystallized intelligence test scores measured in many parts of the world from roughly 1930 to the present day. When intelligence quotient (IQ) tests are initially standardized using a sample of test-takers, by convention the average of the test results is set to 100 and their standard deviation is set to 15 or 16 IQ points. When IQ tests are revised, they are again standardized using a new sample of test-takers, usually born more recently than the first. Again, the average result is set to 100. However, when the new test subjects take the older tests, in almost every case their average scores are significantly above 100.
Test score increases have been continuous and approximately linear from the earliest years of testing to the present. For the Raven's Progressive Matrices test, subjects born over a 100-year period were compared in Des Moines, United States, and separately in Dumfries, Scotland. Improvements were remarkably consistent across the whole period, in both countries. This effect of an apparent increase in IQ has also been observed in various other parts of the world, though the rates of increase vary.
There are numerous proposed explanations of the Flynn effect, as well as some skepticism about its implications. Similar improvements have been reported for other cognitions such as semantic and episodic memory. Recent research suggests that the Flynn effect may have ended in at least a few developed nations, possibly allowing national differences in IQ scores to diminish if the Flynn effect continues in nations with lower average national IQs.
The Flynn effect is named for James R. Flynn, who did much to document it and promote awareness of its implications. The term itself was coined by Richard Herrnstein and Charles Murray, authors of The Bell Curve (1994). Although the general term for the phenomenon referring to no researcher in particular continues to be "secular rise in IQ scores", many textbooks on psychology and IQ testing have now followed the lead of Herrnstein and Murray in calling the phenomenon the Flynn effect.
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