It seems obvious that IQ test scores can be improved with interventions and further that actual [as opposed to measured] general intelligence can be affected by environmental factors that shape whether the brain develops under good, neutral, or damaging conditions (nutrition, sleep, language usage, stress, etc.).
replyWith all the energy that's been spent on the topic, I'm slightly surprised that this isn't entirely settled by now and any opposing view being relegated to fringe/flat-earth territory.
I don't see why it's surprising: IQ is one of the few tools that modern scientific racists have in their toolbox. One wouldn't expect them to let such trifling concerns as "evidence" and "testable models with successful predictions" take that away from them.
reply> Was it better medicine and food that stopped both your height and your brain from being stunted?
replyThe ban on leaded petrol probably also helped.
The timeline doesn't match.
replyThe Flynn Effect covers from around 1930s to 1980s and the phase out of leaded gasoline happened during the very end of that timeline, meaning adolescent IQ measurements during the time the Flynn Effect covers would have all been raised in an environment where leaded fuel was either dominant or at least common.