They’re not mentioning the effects of vaccines, less healthy food, cellphone and cell tower radiation, being nursed on soy milk instead of mother’s milk, etc..
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The Flynn effect – named after the work of Kiwi intelligence researcher James Flynn – observed rapid rises in intelligence quotient at a rate of about 3 IQ points per decade in the 20th century, but new research suggests these heady boom days are long gone.

An analysis of some 730,000 IQ test results by researchers from the Ragnar Frisch Centre for Economic Research in Norway reveals the Flynn effect hit its peak for people born during the mid-1970s, and has significantly declined ever since.

“This is the most convincing evidence yet of a reversal of the Flynn effect,” psychologist Stuart Ritchie from the University of Edinburgh, who was not involved in the study, told The Times. …

What the results show is that a turning point for the Flynn effect occurred for the post-1975 birth cohorts, equivalent to 7 fewer IQ score points per generation.

It’s not the first time we’ve seen this kind of dip. Research by Flynn himself that looked at the IQs of British teenagers almost a decade ago observed a similar fall in test scores. …

In the new study, the researchers observed IQ drops occurring within actual families, between brothers and sons – meaning the effect likely isn’t due to shifting demographic factors as some have suggested, such as the dysgenic accumulation of disadvantageous genes across areas of society.

Instead, it suggests changes in lifestyle could be what’s behind these lower IQs, perhaps due to the way children are educated, the way they’re brought up, and the things they spend time doing more and less (the types of play they engage in, whether they read books, and so on).

STORY