Emil O W Kirkegaard on Twitter: "Alex, the most prolific researcher on trying to figure out the mysterious of the Flynn effect and its related temporal correlates/causes is Michael Woodley. His output is enormous, so there is plenty to read. Skim his RG for relevant stuff. https://t.co/ijaF2f8tte… https://t.co/9drGHPwmJ7"

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Geoffrey Miller‏Verified account @primalpoly 3 Nov 2018

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Geoffrey Miller Retweeted Steve Stewart-Williams

If you take 5 minutes to read this thread, you'll know more about IQ than 80% of journalists and social scientists.https://twitter.com/SteveStuWill/status/1057962279713435650 …

Geoffrey Miller added,

Steve Stewart-Williams @SteveStuWill

THREAD: 12 Things Everyone Should Know About IQ 1. IQ is one of the most heritable psychological traits – that is, individual differences in IQ are strongly associated with individual differences in genes (at least in fairly typical modern environments). http://www18.homepage.villanova.edu/diego.fernandezduque/Teaching/PhysiologicalPsychology/zCurrDir4200/CurrDirGeneticsTraits.pdf … pic.twitter.com/0ty6pq48sd

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alex rubinsteyn‏ @iskander 3 Nov 2018

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Replying to @primalpoly

This thread doesn't reconcile or explain IQ's weird contradictions. Why does heritability increase with age and why is this highly heritable trait increasing *dramatically* between generations?

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Synthetic‏ @SR71999 3 Nov 2018

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Replying to @iskander @primalpoly

The Flynn Effect is not g-loaded (even Flynn himself now admits this); and the g factor is the most heritable component of IQ scores. There's some evidence that g is even decreasing. The cause of the FE is unknown but is plausibly due to practice effects and the like.

1 reply 1 retweet 6 likes

alex rubinsteyn‏ @iskander 3 Nov 2018

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Replying to @SR71999 @primalpoly

Any papers I can read on that? Also, is there a standard method for decomposing IQ into something more directly correlated with g vs. other factors? And if so, why bother talking about IQ rather than this more informative derived quantity?

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Synthetic‏ @SR71999 3 Nov 2018

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Replying to @iskander @primalpoly

General background on g - Jensen's "The g factor." Flynn's "What is Intelligence" for more on FE. Papers by Linda Gottfriedson are good for more on g. Non-technical example here ->https://www.cato-unbound.org/2007/11/08/linda-s-gottfredson/shattering-logic-explain-flynn-effect …

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Synthetic‏ @SR71999 3 Nov 2018

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Replying to @SR71999 @iskander @primalpoly

For arguments on declining g, see the work of Michael Woodley. https://www.amazon.com/At-Our-Wits-End-Intelligent/dp/184540985X/ref=sr_1_1?ie=UTF8&qid=1541277030&sr=8-1&keywords=Michael+Woodley …

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Synthetic‏ @SR71999 3 Nov 2018

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Replying to @SR71999 @iskander @primalpoly

g is typically computed from Principle Components Analysis (which I am in no way an expert of) from a psychometric test consisting of a battery of subtests. Each subtest's loading on this general factor can then be computed.

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Synthetic‏ @SR71999 3 Nov 2018

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Replying to @SR71999 @iskander @primalpoly

The Flynn Effect is on sub-tests which have very little g loading. Highly g-loaded subtests (like vocabulary and arithmetic) show virtually know change.

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Synthetic‏ @SR71999 3 Nov 2018

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Replying to @SR71999 @iskander @primalpoly

I don't know a lot about calculating heritability beyond the basics. Perhaps others can fill in some technical details. cc: @NoamJStein @pnin1957 @KirkegaardEmil

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Emil O W Kirkegaard‏ @KirkegaardEmil 3 Nov 2018

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Replying to @SR71999 @iskander and

Alex, the most prolific researcher on trying to figure out the mysterious of the Flynn effect and its related temporal correlates/causes is Michael Woodley. His output is enormous, so there is plenty to read. Skim his RG for relevant stuff.https://www.researchgate.net/profile/Michael_Woodley_Of_Menie/research …

1:43 PM - 3 Nov 2018

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