an ability that people and other animals may share,
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.




Struggling to separate some pure response to numerosity from all the confounding surface areas and other continuous qualities may not even be the most important question, says Lisa Cantrell,
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, now at the University of California, Davis. Human babies,
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, as an example of noncounting animals, might start figuring out the world by relying on these other confounders and grow into their numerical abilities,
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, she and Linda Smith of Indiana University, Bloomington,
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, suggested in 2013. The hypothesized approximate number system might be part of some more general way of perceiving the world,
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, which can draw on multiple clues to get a clearer sense of quantity. Cantrell and Smith called their version of the idea the “signal clarity hypothesis.”
Into their heads
Studying behavior alone isn’t enough to trace the inheritance of any part of number savvy,
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, says Andreas Nieder of the University of Tübingen in Germany. “At the behavioral level,
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, it may look as if number estimation follows the same laws, but the underlying neural code could actually look quite different.”
He’s not going as far afield as fish yet, but Nieder and colleagues have looked at how monkey and bird brains handle quantity. The researchers described neurons (nerve cells) in the brains of carrion crows (Corvus corone corone) that function much

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