In 2010, scientists carried out an experiment to study baby rats’ neural activity in their brains. Although the rats were newborns, the researchers discovered that their head-direction cells (which help them recognize the direction they’re facing) were fully grown and developed. The rats, it seemed, were born with a sense of direction. And they hadn’t even opened their eyes yet!

　　Humans, of course, are not rats. But the hippocampus—the brain area we use for navigation—is similar in most mammals. If the rat’s compass develops this way, then it’s likely that a human’s compass does, too.

　　If we’re born with a sense of direction, then why are some people so good at getting lost? The scientists found that the two other cells—place and grid cells—developed within the first month. Place cells are thought to help us form a map in our mind, while grid cells help us navigate new and unfamiliar places. The two cells work together, and that’s where the trouble might be.

　　People who took part in a 2017 study played a video game that required them to travel quickly between different places. Monitoring their brains, the scientists found that grid cells helped the gamers recognize where they were—even without landmarks. According to researcher Michael Kahana, differences in how grid cells work may help explain why some people have a better sense of direction than others.

　　32. What did the 2010 research find?

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