"Luck", in terms of the factors that influence IQ, does not seem to include much shared family environment, at least not in typical western societies. Probably hitting the kid on the head with a hammer actually _would_ make a difference, but few people do that.
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Replying to @gcochran99 @Biorealism and
Yeah but it almost certainly includes how wealthy the society is
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Replying to @JamesPsychol @bechhof and
Even if the main effects of wealth or poverty were small, they interact with shared environment in IQ so what
@bechhof says seems plausible to mehttp://journals.plos.org/plosone/article?id=10.1371/journal.pone.0030320 …5 replies 0 retweets 10 likes -
Replying to @salonium @JamesPsychol and
Problem w/IQ studies are numerous, but the most obvious flaw is that twin studies are what's usually studied. In other words, you can't control for the health of the mother. So ofc the genetic components must return some degree of false positives.
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Replying to @suvyboy @JamesPsychol and
Yes, but from adolescence onwards twins are representative of the general population on intelligence tests and most other outcomes.
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Not quite: Twins suffer about 5 pts IQ depression. It's crowded in there.
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Replying to @gcochran99 @salonium and
That's old information. It's not true in more recent cohorts: https://genepi.qimr.edu.au/contents/publications/staff/INTELL4302.pdf …
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Interesting. wonder how infertility treatments factor in: more than 1/3rd of twins in the US are due to fertility treatments. different demographic than in the past?
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Replying to @gcochran99 @salonium and
Yeah, that could be a factor. A couple more studies showing that the twin disadvantage is gone across the West: http://sci-hub.tw/http://journals.sagepub.com/doi/abs/10.2466/pr0.102.3.951-962 … and https://s3.amazonaws.com/academia.edu.documents/43425473/Is_there_still_a_cognitive_cost_of_being20160306-9576-5whlko.pdf?AWSAccessKeyId=AKIAIWOWYYGZ2Y53UL3A&Expires=1526852239&Signature=MB49lABR9OC47bZ%2FmeOKIZLwOJU%3D&response-content-disposition=inline%3B%20filename%3DIs_there_still_a_cognitive_cost_of_being.pdf …
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Lower rates of birth trauma?
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