I clarify:
Let’s say scientists can’t come up with solutions to global problems, AI gets out of control and turns almost everyone into paperclips during wars, and in the 2040s or 2050s, the surviving people (about a few tens of millions around the world or even less) gradually return to the level of intelligence of their distant ancestors?
We didn’t advance in intelligence, at all, as that’s “the capacity for, with information and tools, find a way to put them to use”
We had less information, and because of that no knowledge of how to make better tools, but if you gave someone from 5000 years ago the information and tools, they would be intelligent enough to figure out how to use them without instruction.
There are also issues of societal specialization leading to the ability of individuals to specialize in gaining knowledge, instead of 100% of the population working 99% of the time on survival.
But my brain and Og the Caveman are basically the same.