The answer is in this Twitter threat by Brian Roemmele:
I didn’t know we had such a huge short-term memory capacity such as the one the chimpanzee shows in the embedded video in the twit thread. I found fascinating the idea that our brains have been modified over decades and decades to change their shape and plasticity to adapt themself in the times we live in. It makes sense to me that we lost part of the areas and brain connectivity involved in short-term memory and replace it with a more strong connection among language areas, such as Broca’s, Wernicke’s and phonological areas. To put it in other words, the loss of immediate memory leave place for the acquisition of language. Therefore, we humans speak, and chimpanzees don’t.
If you keep reading the Twit thread you’ll find out about the controversy of whether chimpanzees have actually an extraordinary short-term memory compared to us or whether it’s just a training effect and we could outperform chimpanzees if we get trained too. I’ll leave that in your own hands.
Feature image from Pexels – CC0.