IQ scores are falling and have been for decades, new study finds

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(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.

“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.

The earlier rise in IQ scores follows the “Flynn effect,” a term for the long-term increase in intelligence levels that occurred during the 20th century, arguably the result of better access to education, according to Stuart Ritchie, a postdoctoral fellow in cognitive ageing at the University of Edinburgh whose research explores IQ scores and intelligence and who was not involved in the new study.

Researchers have long preferred to use genes to explain variations in intelligence over environmental factors. However, the new study turns this thinking on its head.

Intelligence is heritable, and for a long time, researchers assumed that people with high IQ scores would have kids who also scored above average. Moreover, it was thought that people with lower scores would have more kids than people with high IQ scores, which would contribute to a decline in IQ scores over time and a “dumbing down” of the general population, according to Rogeberg.

Anyone who has seen the film “Idiocracy” might already be familiar with these ideas. In the scientific community, the idea of unintelligent parents having more kids and dumbing-down the population is known as the dysgenic fertility theory, according to Ritchie.

The study looked at the IQ scores of brothers who were born in different years. Researchers found that, instead of being similar as suggested by a genetic explanation, IQ scores often differed significantly between the siblings.

“The main exciting finding isn’t that there was a decline in IQ,” Ritchie said. “The interesting thing about this paper is that they were able to show a difference in IQ scores within the same families.”

The study not only showed IQ variance between children the same parents, but because the authors had the IQ scores of various parents, it demonstrated that parents with higher IQs tended to have more kids, ruling out the dysgenic fertility theory as a driver of falling IQ scores and highlighting the role of environmental factors instead.

What specific environmental factors cause changes in intelligence remains relatively unexplored.

Access to education is currently the most conclusive factor explaining disparities in intelligence, according to Ritchie. In a separate study that has not been released, he and his colleagues looked at existing research in an effort to demonstrate that staying in school longer directly equates to higher IQ scores.

But more research is needed to better understand other environmental factors thought to be linked to intelligence. Robin Morris, a professor of psychology at Kings College in London who was not involved in Ritchie’s research, suggests that traditional measures of intelligence, such as the IQ test, might be outmoded in today’s fast-paced world of constant technological change.

“In my view, we need to recognize that as time changes and people are exposed to different intellectual experiences, such as changes in the use of technology, for example social media, the way intelligence is expressed also changes. Educational methods need to adapt to such changes,” Morris said.

 

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5 comments

  • C

    In the past few decades, thanks to liberals, the 3RS have taken a back seat to touchy-feely, no right or wrong answer drivel at an age when students should be taught the basics of objective thinking and let them worry about things that are abstract later.

      • Kevin

        Thats funny you think high IQ people support corruption of government. You probably are incapable of thinking for yourself which is sad. Everyone that I know that voted for Trump did it to vote against Hillary. When the Bush family votes for Hillary after destroying our country, how can you feel good about that? Has to be low IQ.

  • Old Bob

    Could it be today’s children have no parenting so to speak, no pride in themselves or their work, no moral pride. Todays kids need to turn off the TV, cell phones and get outside and experience life. Get a job cutting grass, shoveling snow, weed flowers. Do something to help build character.

  • Kevin

    Flouride in the water. Why else did the nazis do it? Grand Rapids was the first US city to poison its citizens with it too. How fun to be #1.