Re:Soybean oil affects hypothalamus, causes genetic changes ...
by somenameforme on Thursday February 24, 2022 @12:59PM
(#30457977)
The Flynn effect has been observed to have reversed in a number of nations in Scandinavia and elsewhere. [1] Scandinavia is the typical test bed because of have compulsory military enlistment paired with IQ testing. And the declines are quite substantial with Norway seeing a 5 point decline between individuals born in 1991 compared to those born in 1975, and a 3 point decline compared to those born in 1962.
Big meta studies may miss this because its a relatively new trend, and IQ is full of a million biases that can just generate noise when combined. When people are young, their IQ is significantly influenced by environmental factors, but as they age genetic factors become dominant. And in countries without some form of compulsory testing, sample biases abounds.
As for the past gains, look at height! Height is reasonable proxy for nutrition and globally it's just skyrocketed [2]. Japan is one of the more extreme examples, with their average height increasing by about half a foot since 1896!
Big meta studies may miss this because its a relatively new trend, and IQ is full of a million biases that can just generate noise when combined. When people are young, their IQ is significantly influenced by environmental factors, but as they age genetic factors become dominant. And in countries without some form of compulsory testing, sample biases abounds.
As for the past gains, look at height! Height is reasonable proxy for nutrition and globally it's just skyrocketed [2]. Japan is one of the more extreme examples, with their average height increasing by about half a foot since 1896!
[1] - https://en.wikipedia.org/wiki/Flynn_effect#Possible_end_of_p...
[2] - https://ourworldindata.org/grapher/average-height-of-men?tab...