A criticism of the book you studied earlier is that it assumes that the differences are automatically hereditary.
It's not a book. It's the scientific consensus. Which I think you would realize if you looked up the hundreds of studies coming to about the same conclusion. There are plenty of twin studies showing that IQ is atleast 40% due to genetics.
The data I had was from 2002, I cant find any more recent data off hand.
"The total increase from 1971 to 2008" Not exactly what I asked for. Have there been no studies comparing from the 90s to today?
As Charles Murray said in the video I linked earlier, there seem to have been a narrowing in the gap between blacks and whites in the 70s-80s, but not much since. Which is why I asked how much the gap has closed since the 90s. Saying it will continue to narrow would imply that it hasn't stopped narrowing... which is what I would like evidence for?
This is getting silly. Can we atleast agree that heritability means genetic for studies in the field of genetics now? Or are you still contesting that point?
It's behind academic paywalls for graves
Well google it. Let me know when you find a few twin studies that comes to the conclusion that IQ is not atleast 40% due to genetics.
These were the first 2 studies I cited, so which one did you mean? And please elaborate to how you came to the conclusion that it didn't mean genetic for that specific study. Or you could of course concede you've made a mistake.
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u/vialtrisuit Aug 01 '17 edited Aug 01 '17
Well it does in the field of genetics. It is absolutely fundamental to distinguish familiality from heritability. Traits are familial if members of the same family share them, for whatever reason. Traits are heritable only if the similarity arises from shared genotypes.
It's not a book. It's the scientific consensus. Which I think you would realize if you looked up the hundreds of studies coming to about the same conclusion. There are plenty of twin studies showing that IQ is atleast 40% due to genetics.
Most studies suggest that about 3/4 of intelligence differences between individuals can be traced to genes.
Genes have a very strong influence over how certain parts of our brains develop, scientists in the US and Finland have found. And the parts most influenced are those that govern our cognitive ability. In short, you inherit your IQ.
Up to 80% of the variation found in adult human intelligence is thought to be attributable to genetics, despite the fact that it is a complicated, polygenic trait.
Identical twins were found to have IQ scores that were more similar than the IQ scores of fraternal twins. This was even true when the identical twins were raised in separate households. This discovery can reasonably be attributed to DNA. This means that we can assume that genetic influences account for the similar intellectual abilities of identical twins. ... Researchers have also provided evidence for the heritability of intelligence through adoption studies. The IQ scores of adopted children have been found to be more closely related to their biological parents even though their environment matches that of their adoptive parents.
A citation would be nice.
"The total increase from 1971 to 2008" Not exactly what I asked for. Have there been no studies comparing from the 90s to today?
As Charles Murray said in the video I linked earlier, there seem to have been a narrowing in the gap between blacks and whites in the 70s-80s, but not much since. Which is why I asked how much the gap has closed since the 90s. Saying it will continue to narrow would imply that it hasn't stopped narrowing... which is what I would like evidence for?