Feynman came up with a potential test by tracking the things he could and couldn't do while counting seconds (via internal monologue). He found he generally co

Feynman came up with a potential test by tracking the things he could and couldn't do while counting seconds (via internal monologue). He found he generally count not talk while counting. He then had others try and found that one of his mathematician friends was able to talk just fine while counting because it turned out he was counting visually. https://www.youtube.com/watch?v=Cj4y0EUlU-Y https://www.youtube.com/watch?v=Cj4y0EUlU-Y