BTW, it appears that the Flynn effect might have reversed recently.
US: "A reverse Flynn effect was found for composite ability scores with large US adult sample from 2006 to 2018 and 2011 to 2018. Domain scores of matrix reasoning, letter and number series, verbal reasoning showed evidence of declining scores."
Denmark: "The results showed that the estimated mean IQ score increased from a baseline set to 100 (SD: 15) among individuals born in 1940 to 108.9 (SD: 12.2) among individuals born in 1980, since when it has decreased."
US: "A reverse Flynn effect was found for composite ability scores with large US adult sample from 2006 to 2018 and 2011 to 2018. Domain scores of matrix reasoning, letter and number series, verbal reasoning showed evidence of declining scores."
https://www.sciencedirect.com/science/article/pii/S016028962...
https://www.forbes.com/sites/michaeltnietzel/2023/03/23/amer...
Denmark: "The results showed that the estimated mean IQ score increased from a baseline set to 100 (SD: 15) among individuals born in 1940 to 108.9 (SD: 12.2) among individuals born in 1980, since when it has decreased."
https://pubmed.ncbi.nlm.nih.gov/34882746/
https://pubmed.ncbi.nlm.nih.gov/34882746/#&gid=article-figur...