IQ has plateaued or gone down for some western countries while continuing to rise elsewhere (shitty table copy but search for it in the link to read):
Country Peak Gain Period Reversal Detected? Approximate Reversal Date Source Basis
Norway 1954–1995 Yes ~1995 Military conscript data
Denmark 1959–1998 Yes ~1998 Military conscript data
France 1949–1999 Yes ~1999 National assessment data
United Kingdom 1950s–2000s Partial ~2000s Multiple study sources
United States 1932–1990s Plateau ~1990s Normative restandardizations
Netherlands 1952–1980s Unclear Debated Wechsler norm comparisons
Kenya 1980s–2000s No
IQ has plateaued or gone down for some western countries while continuing to rise elsewhere
You’re describing the “Reverse Flynn Effect”, which is still hotly debated as happening at all much less happening to this day. And it’s got nothing to do with modern-day school performance listed in OP’s image. The Flynn Effect is more neatly tied to the Lead-Crime Hypothesis, having emerged in the 1990s and largely restricted itself to post-industrial nation states.
IQ has plateaued or gone down for some western countries while continuing to rise elsewhere (shitty table copy but search for it in the link to read):
Country Peak Gain Period Reversal Detected? Approximate Reversal Date Source Basis Norway 1954–1995 Yes ~1995 Military conscript data Denmark 1959–1998 Yes ~1998 Military conscript data France 1949–1999 Yes ~1999 National assessment data United Kingdom 1950s–2000s Partial ~2000s Multiple study sources United States 1932–1990s Plateau ~1990s Normative restandardizations Netherlands 1952–1980s Unclear Debated Wechsler norm comparisons Kenya 1980s–2000s No
https://neurolaunch.com/rise-in-average-iq-scores-over-the-20th-century/
You’re describing the “Reverse Flynn Effect”, which is still hotly debated as happening at all much less happening to this day. And it’s got nothing to do with modern-day school performance listed in OP’s image. The Flynn Effect is more neatly tied to the Lead-Crime Hypothesis, having emerged in the 1990s and largely restricted itself to post-industrial nation states.
I was replying to you, and you were discussing IQ.
Also, not hotly debated, but more complicated: https://personality-project.org/revelle/publications/dworak.23.pdf