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Can you spot a 'fake' accent? It will depend on where you're from

We all need to learn how to place trust in others. It's easy to be misled. Someone who doesn't deserve trust a lot like someone who does—and part of growing up in a society is developing the ability to tell the difference.

An important part of this is learning about the signals people give about themselves. These might be a smile, a style of dressing or a way of speaking. In particular, we use accents to make decisions about others—especially in the UK.

But what if people adapt or change their accents to fit into a certain social group or geographical area? Our past has shown that native speakers are pretty good at spotting such speech. We've now published a that supports and further strengthens our original results.

We associate accents with places, classes and groups. Research shows that even infants to determine whether they think someone is considered trustworthy. This can be a problem—studies have demonstrated that accents can affect someone's —and potentially the of a crime.

As with most topics in the social sciences, evolutionary theory has a lot to say about this process. Scientists are interested in understanding how people send and receive signals like accents, how those signals affect relationships between people and how, in turn, those relationships affect us.

But because accents can affect how we treat each other, we'd expect some people to try to change them for personal gain. A social chameleon who can pretend to be a member of any social class or group is likely to win trust within each—assuming they are not caught.

If that's true, though, then we'd expect people to also be good at detecting when someone is "faking" it—what we call mimicry—setting up a kind of arms race between those who want to deceive us into trusting them and those who try to catch deceivers out.

Over the last few years, we've looked into how well people detect accent mimicry. Last year we found that generally speaking, people in the UK and Ireland are strong at this, detecting mimicked accents in the UK and Ireland better than we'd expect by chance alone.

What was more interesting, though, was that native listeners from the specific places of the imitated accent—Belfast, Glasgow and Dublin—were a lot better at this task than were non-natives or native listeners from further away in the UK, like Essex.

Beyond the UK

Our new findings went further, though. Of the roughly 2,000 people that participated, more than 1,500 were this time based in English-speaking countries outside the UK, including the US, Canada and Australia. And on average, this group did a lot worse at detecting mimicked accents from seven different regions in the UK and Ireland than did people from the UK.

In fact, people from places other than the UK barely did better than we'd expect by chance, while people who were native listeners were right between about two-thirds and three-quarters of the time.

As we argued in our original article, we believe it's local cultural tensions—tribalism, classism or even warfare—that explain the differences. For example, as someone commented to me some time ago, people living in Belfast in the 1970s and 80s—a time of huge political tension—needed to be attuned to the accents of those around them. Hearing something off, like an out-group member's accent, could signal an imminent threat.

This wouldn't have put the same pressures on people living in a more peaceful regions. In fact, we found that people living in large, multicultural and largely peaceful areas, such as London, didn't need to pay much attention to the accents of those around them and were worse at detecting mimicked accents.

The further you move out from the native accent, too, the less likely a listener is to place emphasis on or notice anything wrong with a local accent. Someone living in the US is likely to pay even less attention to an imitation Belfast accent than is someone living in London, and accordingly will be worse at detecting mimicry. Likewise, someone growing up in Australia would be better at spotting a mimicked Australian accent than a Brit.

So while accents, and our ability to detect differences in accents, probably evolved to help us place trust more effectively at a broad level, it's the cultural environment that shapes that process at the local level.

Together, this has the unfortunate effect that we sometimes place a lot more emphasis on accents than we should. How someone speaks should be a lot less important than what is said.

Still, accents drive how people treat each other at every level of society, just as other signals, be they tattoos, smiles or clothes, that tell us something about another person's background or heritage.

Learning how these processes work and why they evolved is critical for overcoming them—and helping us to override the biases that so often prevent us from placing trust in people who deserve it.