From Imperial Valley News:
The findings suggest that these stages of number-learning are a necessary part of the process of building number concepts, says Barbara Sarnecka, an associate professor of cognitive sciences at the University of California, Irvine who was not part of the research team. “Basically, everyone seems to follow the same path to number knowledge, whether they are a preschooler in a highly industrialized, numerate society or a 12-year-old in a farming and foraging society in Bolivia. That tells us a lot about how number concepts are built in the mind,” she says.

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