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RE: Elephants use a large number of neurons to control their trunk and ears
I'm not sure about us having problems with more digits. I remember an experiment some years ago where a person was given a robotic sixth finger. It took him little time to get used to it and eventually when it was taken away the brain missed the extra digit.
I'll look for it.
Here it is:
https://www.ucl.ac.uk/news/2021/may/robotic-third-thumb-use-can-alter-brain-representation-hand
I remember reading even older, tho. Perhaps I'm mixing memories.
I'll never remember where or when I read that. It was some time ago. But this would suggest that maybe it was wrong, anyway.