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Don’t get too creeped out, but there are a whole lot of people walking around right now with a map of your face in their brains. But at least it’s a two-way street—you have their faces mapped in yours, too. That’s the conclusion of a recent report published in the journal Cortex. Social animals depend on being able to recognize one another. All monkeys might look the same to you, but you can be sure that they can tell each other apart. The same is true for humans. The ability to identify another person is a vital part of social interaction, which is an essential part of our lives. 

For that reason, our brains seem to devote a lot of real estate to facial recognition. Scientists believe that most of the work of facial perception happens in two brain sections: the occipital face area (OFA) and the fusiform face area (FFA). But it wasn’t clear how those regions managed recognition.