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I'd bet on the underlying factor being nutrition. Processed foods, sugar substitutes, and forever chemicals in everything to an extent earlier generations never

• eesmith 4y ago
  End of the abstract from that Swedish study at https://www.sciencedirect.com/science/article/abs/pii/S0160289612001055 https://www.sciencedirect.com/science/article/abs/pii/S01602... : > Finally, comparisons of trends in cognitive performance and in standing height show that the gains in cognitive performance over the years from 1980 to 1993 occurred in the absence of overall gains in height, which speaks against nutrition as the cause of the Flynn effects. Thing is, you can point to all sorts of changes. Perhaps it's more screen time, or any other pet peeve. From my cursory reading of those papers, there's no clear reason for the Flynn effect, nor its (putative) reversal despite lots of correlation studies.