You didn't take the full article into account for either.
The researchers sourced their data from the
IQ test scores of 18- to 19-year-old Norwegian men who took the tests as part of their national, compulsory military service.
Between the years 1970 to 2009, three decades of these young men (born between 1962 to 1991) were conscripted, resulting in over 730,000 IQ test results.
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.
"It looks like there is something screwy among British teenagers," Flynn told
The Telegraph at the time.
"While we have enriched the cognitive environment of children before their teenage years, the cognitive environment of the teenagers has not been enriched."
Although that kind of environmental attribution remains hypothetical, it's a possibility that's supported by the latest research – which, it's worth emphasising, comes from just one Norwegian sample (albeit a particularly huge one)."
Further from the CNN article:
(CNN)IQ scores have been steadily falling for the past few decades, and environmental factors are to blame, a new study says.
The research suggests that genes aren't what's driving the decline in IQ scores, according to the
study, published Monday.
Norwegian researchers analyzed the IQ scores of Norwegian men born between 1962 and 1991 and found that scores increased by almost 3 percentage points each decade for those born between 1962 to 1975 -- but then saw a steady decline among those born after 1975.
Similar studies in Denmark, Britain, France, the Netherlands, Finland and Estonia have demonstrated a similar downward trend in IQ scores, said Ole Rogeberg, a senior research fellow at the Ragnar Frisch Center for Economic Research in Norway and co-author of the new study.
Fluoride exposure in utero linked to lower IQ in kids, study says
"The causes in IQ increases over time and now the decline is due to environmental factors," said Rogeburg, who believes the change is not due to genetics.
"It's not that dumb people are having more kids than smart people, to put it crudely. It's something to do with the environment, because we're seeing the same differences within families," he said.
These environmental factors could include changes in the education system and media environment, nutrition, reading less and being online more, Rogeberg said.
So specifically, Teenager IQs are dropping., not children IQs which are increasing.