like those in rhesus macaques.
Research in monkeys over the last 15 years has identified what Nieder calls “number neurons.” They could have multiple functions, but each responds to a specific number of whatevers, be it six crows or six crowbars. Some number neurons respond to sight,
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Story continues after graphic

Brain basics


Bird brains lack a fancy six-layered outer cortex. But carrion crows (right) have a brain area (nidopallium caudolater?ale) rich in nerve cells that respond to quantity. In the macaque (left),
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, number neurons are in a different area,
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, mainly the prefrontal cortex.




The neurons could be responding to increasing total surface area or density or darkness. But researchers have varied one aspect at a time,
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, to argue that as far as strenuous efforts can tell,
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, these neurons detect the actual numerosity.
Individual neurons in parts of a monkey brain have their own preferred number and respond most strongly to it and less so to neighboring numbers. The neurons for three get less excited for two and four, while others light up at four. In

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