When you watch a skilled guitarist play, it’s fascinating to see her left hand and right hand doing entirely different things, yet synchronized perfectly towards a common effort. The guitarist can perform complex tasks with many moving parts because she has a central nervous system with a sophisticated, unified brain. Her brain maintains a model of her external environment and goals within it and coordinates her hands to achieve them: One strums the strings to create the notes, the other presses the strings against the frets to set the pitch. The result is beautiful music.
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