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Via Tyler Cowen, this is a genuinely startling result:

….material incentives in random-assignment studies increased IQ scores by an average of 0.64 SD, suggesting that test motivation can deviate substantially from maximal under low-stakes research conditions. The effect of incentives was moderated by IQ score: Incentives increased IQ scores by 0.96 SD among individuals with below-average IQs at baseline and by only 0.26 SD among individuals with above-average IQs at baseline.

Let me translate this into English. On IQ tests, a single standard deviation equals 15 points. So if this research is right, giving people actual incentives to do well on IQ tests (money, for example) has the following effect:

  • Those with low IQs scored 14 points higher.
  • Those with high IQs scored 4 points higher.

In other words, giving people an incentive to do well collapsed the gap between high and low by ten points — and bigger incentives created even bigger effects. These results are based on a meta-analysis of previous studies, not on new research, and metastudies are notoriously tricky to do properly. So take this with the usual grain of salt until these results get replicated elsewhere.

But ten points is a helluva lot. If this holds up, it’s pretty significant.

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THE TRUTH...

is the first thing despots go after. An unwavering commitment to it is probably what draws you to Mother Jones' journalism. And as we're seeing in the US and the world around, authoritarians seek to poison the discourse and the way we relate to each other because they can't stand people coming together around a shared sense of the truth—it's a huge threat to them.

Which is also a pretty great way to describe Mother Jones' mission: People coming together around the truth to hold power accountable.

And right now, we need to raise about $400,000 from our online readers over the next two months to hit our annual goal and make good on that mission. Read more about the information war we find ourselves in and how people-powered, independent reporting can and must rise to the challenge—and please support our team's truth-telling journalism with a donation if you can right now.

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