Flynn effect research says otherwise.
If you think prehistoric humans were geniuses because They could survive in the wild, by that measure monkeys and gorillas must be geniuses too.
Flynn effect is just a trend for the past century or so and it's an international measure. For the past decade there's been a trend for the US exclusively that is not aligned with the flynn effect.
https://news.northwestern.edu/stories/2023/03/americans-iq-s...
Flynn effect research says otherwise.
If you think prehistoric humans were geniuses because They could survive in the wild, by that measure monkeys and gorillas must be geniuses too.