Humans, including infants, and many other species have a capacity for rapid, nonverbal estimation of numerosity. However, the mechanisms for number perception are still not clear; some maintain that ...

Most people learn to count and do basic arithmetic at a young age and don’t give these skills a second thought. But numerosity or numeracy, the ability to think about and use numbers, is more than a ...

While some experiments try to test animals' perception of quantities in natural settings, others use training paradigms that offer experimenters more control over the conditions. All face the obstacle ...