You often have to make quick judgments about the number of objects you encounter in the world. You might see a group of people walking toward you. It is useful to know whether there are roughly five, ...

Is it possible to count objects you can't see? If you've ever received a boxed gift, or a mysterious package from Amazon, you might have tried to lightly shake the box to try to guess its contents.

Humans and animals have a "number sense," an inborn ability to register the number of objects in a scene. The neural basis of this ability is believed to be what are called the number neurons, which ...