“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."
IQ scores have been steadily falling for the past few decades, with changes in our environment and the way we are learning thought to be reasons why, a new study suggests.
www.cnn.com
Using administrative register data with information on family relationships and cognitive ability for three decades of Norwegian male birth cohorts, we show that the increase, turning point, and decline of the Flynn effect can be recovered from within-family variation in intelligence scores...
www.pnas.org