(CNN) -- IQ scores have been steadily falling for the last few decades, and environmental factors are to blame, a new study says.
The researchers suggest that environmental factors -- not genes -- are 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 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, said Rogeberg.
The earlier rise in IQ scores follows the "Flynn effect" -- a term used to describe the long-term increase in intelligence levels that occurred during the 21st 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 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 that 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 that 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 with the same parents but born in different years to test the theory. They found that IQ scores -- instead of being similar as suggested by a genetic explanation -- often differed significantly between the siblings.
"The main exciting finding, isn't that there was a decline in IQ," said Ritchie. "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 siblings from the same parents, but because the authors had the IQ scores of various parents, it also 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, so far, the most conclusive factor explaining disparities in intelligence, according to Ritchie. In a separate study which has not yet been released, Ritchie 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," says Morris.
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