[ivw]

Did the humans train the same amount as the chimps?

Take chess grandmasters, for a counterexample. Their memory of chess positions and speed of processing them is incredible. Here's an example of puzzle rush, where the puzzles get progressively harder: https://youtu.be/B2ywPhNygM8?t=370

[kordlessagain]

The chimps don’t have jobs that tax mind and attention!

[d0mine]

Don't confuse the long term memory which is essentially unlimited (chess example) and the working memory (3-4 items random or ~7 with on-the-fly chunking)