Apparently, chimpanzees can be trained to recognized digits and touch them in numerical order, regardless of the physical locations of the digits. Not only that, but young chimpanzees can be trained to be much better than humans at the task of quickly memorizing the physical locations of digits, and then touching the former locations of the digits in numerical order.
The video explores the hypothesis that humans developed language at the expense of detailed short-term memory. The latter ability is one in which chimpanzees have a huge advantage over humans.
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