in a pair are very different (8 versus 2) and/or involve a small number instead of two large ones (8 versus 9).




When Agrillo tested guppies against humans,
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, both fell behind in accuracy for such difficult comparisons as 6 versus 8. But for small quantities,
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, both fish and people performed well,
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, he and colleagues reported in 2012. People and fish could tell 3 dots from 4 about as reliably as 1 dot from 4. Researchers have long recognized this instant human ease of dealing with very small quantities,
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, calling it subitizing: suddenly just seeing that there are three dots or ducks or daffodils without having to count them. Agrillo suspects the underlying mechanism will prove different from the approximate number systems,
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, though he describes this as a minority view.
The similarity between guppies and people in subitizing skill doesn’t prove it’s a shared inheritance from that ancient common ancestor several hundred million years ago,
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, Agrillo says. Yet the similarity does raise the possibility.

In a blink


Take a quick glance at the clusters below before reading more,
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. You probably just saw that the left-hand box had three dots, but you’d have to count the mosquitoes on the right. That immediate grasp of small quantities is called subitizing,
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,

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