I think there is an aspect of this "dysgenic fertility" thing that may stick for some time. Women in first-world countries (I will include immigrants here) have been given greater incentives to delay motherhood over time. If more women have kids later in life (say, after 35), you'll see more kids with developmental problems, which may impact IQ in the population.
What may take "millenia" is a global cultural shift to foster (intellectually) healthier offspring.
I have a larger argument about female sex selection being the primary driver of overall IQ based on what the females perceive as a specific need in society.
I honestly doubt that due to sex selection pressures, it could be reversed in one or two generations.
I think there is an aspect of this "dysgenic fertility" thing that may stick for some time. Women in first-world countries (I will include immigrants here) have been given greater incentives to delay motherhood over time. If more women have kids later in life (say, after 35), you'll see more kids with developmental problems, which may impact IQ in the population.
What may take "millenia" is a global cultural shift to foster (intellectually) healthier offspring.
I have a larger argument about female sex selection being the primary driver of overall IQ based on what the females perceive as a specific need in society.
I honestly doubt that due to sex selection pressures, it could be reversed in one or two generations.