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I don't know why, but audio perception has the same limitation. Richard Feynman has a story about counting in his head estimate a minute, and how he learned to keep this up while reading a newspaper. His colleague did the same, but couldn't focus on reading while counting. However, he was able to listen to someone talk while doing this process, which Feynman found incredibly difficult. After discussing this, they realized Feynman would imagine a voice counting in his head, while his colleague imagined a ticker tape with numbers on it going by - occupying different processing capabilities in the brain
