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"The Flynn effect has always been tinged with mystery. First popularized by the political scientist James Flynn, the effect refers to the widespread increase in IQ scores over time. Some measures of intelligence — such as performance on Raven’s Progressive Matrices in Des Moines and Scotland — have been increasing for at least 100 years. What’s most peculiar is how scores have increased:
1) Scores have increased the most on the problem-solving portion of intelligence tests.
2) Verbal intelligence has remained relatively flat, while non-verbal scores continue to rise.
3) Performance gains have occurred across all age groups.
4) The rise in scores exists primarily on those tests with content that does not appear to be easily learned.
What’s puzzling about this increase in general intelligence is that it appears where we’d least expect it. While one might assume that IQ scores could increase over time in terms of crystallized intelligence — the part of the test that measures particular kinds of knowledge, such as being able to count or vocabulary words — it’s actually increased on measures of fluid intelligence, which is the ability to solve abstract problems. This has led some psychologists, such as Ian Dreary, to conclude that “large differences in scores are demonstrated in just those situations where similarity would be expected.” Flynn, meanwhile, marveled at the magical constancy of the effect: “It’s as if some unseen hand is propelling scores upward,” he wrote."
So our kids are getting smarter. But we don't know why.
One hypothesis is entertainments are more complex - Harry Potter is more complex than Nancy Drew, video games more than movies. Kids are learning to solve more complex problems routinely thus increasing IQ.
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