My take: The Flynn effect was probably an artifact of people being already trained in the kind of puzzles IQ tests consist of, and the reverse is now true. No real change in g, only a measuring error.
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Best interesting to see how this comports with the hypothesis that the Flynn Effect was the result of it testing very specific knowledge and thinking ability that became more commonplace over the 20th century.
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A change in the trend line is important if true. I’m skeptical of the economic impact. It seems like they’re conflating the relative correlation of IQ and income between two people in the same society with the correlation between total average IQ on the overall economic output
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The Journal of Eugenic Pseudo-Science really is busy these days.
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I'm guessing rampant 3rd-world immigration and hideously processed foods are contributing factors. Maybe even an over-reliance on TVs and smart phones, too.
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Or intelligent people don't take IQ tests seriously anymore.
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Do you recommend "Die Smartphone-Epidemie"?
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I have not read the whole book, but I doubt it. Still, the chapter on Flynn is to the point.
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That timeline would just about coincide with the emergent trend of "Hippie Boomers" to feed their kids vegan and vegetarian diets.
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Curious if Jon Haidt considered these findings when he was writing his new book :)
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