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satt comments on Open thread, July 23-29, 2013 - Less Wrong
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A new study shows that a major part of the Flynn effect in the US was due to iodine in salt. The study suggests that around 15 points of the non-normalized IQ gain was due to this.
I don't know about Flynn, but this is in large part not new news: that the early 1920s US iodization led to measurable gains in enlistees for WWII has been in papers floating around for a while now; for example, "The Economic Effects of Micronutrient Deficiency: Evidence from Salt Iodization in the United States", Feyrer et al 2008. "The Impact of Iodine Deficiency Eradication on Schooling: Evidence from the Introduction of Iodized Salt in Switzerland", Politi 2010, is also cool. Also maybe even voting patterns.
(Citations borrowed from my iodine page.)
I think the paper JoshuaZ's linked is a completed version of that 2008 draft: the authors are the same and the title & abstract are similar.
That link doesn't work for me.
Maybe. I haven't read it yet but I copied it over to http://dl.dropboxusercontent.com/u/182368464/2013-feyrer.pdf
Oh, sorry. They redirected the page instead of using a 404 error, grr, no wonder my
linkcheckerruns didn't pick it up. This link should work: http://web.archive.org/web/20120926070411/http://www.uncg.edu/bae/econ/seminars/2012/Bednar.pdfThat's helpful, thanks!