Isolated for six months, scientists in Antarctica began to develop their own accent

Clark and his colleagues did not notice this at the time. All they knew was that they were taking part in an unusual experiment, which involved tracking their own voices over time. This was done by making 10-minute recordings every few weeks. They would sit in front of a microphone and repeat the same 29 words as they appeared on a computer screen. Food. Coffee. Hid. Airflow. Most were words they used regularly during their day and contained vowel sounds known to differ in English accents.

When the recordings finally got back to a team of phonetics researchers at the Ludwig-Maximilians-University of Munich in Germany for analysis, they discovered that the pronunciation of some of the words had changed ever so slightly. What they were seeing was the beginning of a new accent emerging.

The Antarctic experiment offered a snapshot of something that has happened innumerable times throughout human history, as groups of people have become cut off from others, leading their accents, dialects and even languages to diverge from each other. On a grand scale, the researchers say it can provide insights into why American and British English has diverged in the way it has.

"We wanted to replicate, as closely as we could, what happened when the Mayflower went to North America and the people on board were isolated for a length of time," says Jonathan Harrington, professor of phonetics and speech processing at Ludwig-Maximillians-University of Munich. "Six months isn't very long, so we saw very, very small changes. But we found some of the vowels had shifted."

One of those changes was the "ou" sound in words such as "flow" and "sew" that shifted towards the front of the vocal tract. They also saw some of the winterers beginning to converge in the way they pronounced three other vowels.

The reason for this shift reveals a possible basic mechanism for how we pick up accents throughout our lives.

"When we speak to each other, we memorise that speech and then that has an influence on our own speech production," says Harrington. In effect, we transmit and infect one another with pronunciations every time we interact with others. Over time, if we have regular and prolonged contact with someone, we can start to pick up their sounds.

For people living in an isolated community – perhaps a village in a remote valley, or a settlement on the other side of an ocean – this would lead to accent drift as quirks or misperceptions of speech become exaggerated. But this can take time as accents are produced by extremely fine control of the vocal organs in order to produce the shifts in sounds such as nasalised vowels that characterise certain accents like American English.

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In Antarctica during the winter of 2018, there was another factor at play too – the diversity of the winterers' backgrounds.

Among those staying at Rothera that winter were a couple of Americans, an Icelandic mechanic, a few Germans, some Scots and a Welsh speaker.

"The UK bases in Antarctica are quite unique in how welcoming they are, so you end up with a real melting pot of people from different backgrounds," says Clark, who helped to coordinate the collection of the recordings made by the winterers.

Harrington and his colleagues used computational models to predict how this melting pot of winterers might influence one another. The model used recordings made before the winterers left to simulate what might happen to their accents as they spent time together.  Their prediction was unerringly accurate, even if it did exaggerate the effects compared to what happened in real life. The winterers themselves wouldn't have noticed either as they happened over time. But when the sounds were analysed the changes could be seen within the acoustic waves.

"It was very subtle – you can't hear the changes," says Harrington.

But Clark says some of those staying at the base that winter underwent far more dramatic changes in the way they spoke.

"One of my friends there spoke Welsh as his first language and had a really strong accent when he spoke English," he says. "By the end of our time there his accent had become more like scouse [an accent from Liverpool in England]."

Although his Welsh friend wasn't involved in the accent study, a German woman was. Her accent became more like a native English speaker as she practiced with those around her, according to Harrington and his colleagues.

This mix of people from different cultural backgrounds, languages and accents is not only characteristic of far-flung research stations. It can also be found – on a much larger scale – in modern cities. And just like the Antarctic linguistic microcosm, those big, multicultural cities have been producing their own new dialects and accents, research suggests.

In the southeast of England, one example of this is the development of Multicultural London English, also known as MLE – a dialect that began to emerge in the 1980s in areas of the city where there were high levels of immigration. It is thought to have emerged as East End Cockney blended initially with Jamaican Patois and later other languages from among the 300 or so spoken in London.

Among the influences were the large number of people in London who are learning English as their second language, says Eivind Nessa Torgersen, a professor of English language at the Norwegian University of Science and Technology, who has studied MLE along with colleagues Jenny Cheshire and Susan Fox at Queen Mary, University of London. 

"A number of the MLE speakers have other first languages and grow up using both English and another home language," says Torgersen. "An example is the use of 'wasn't' – as in 'I wasn't, you wasn't, we wasn't, they wasn't'." Older speakers in inner London and young speakers elsewhere in southeast England tend to use "weren't", he says.

"We have seen similar developments in other very large cities in Europe with high levels of migration," he says, giving the examples of a new kind of German in Berlin and a new Swedish dialect in Stockholm. "These contact, multicultural varieties have similar features: dialect and language contact, second-language learning, loan words from other languages. What made MLE different from other multicultural varieties, at least until recently, was that we didn't find many word borrowings from other languages." That, he says, could be in part due to much of the immigration to London coming from Commonwealth countries where people spoke a variation of English.

In the case of Antarctica, residents at the research bases have not only been subtly changing their accents. They have also been developing a kind of Antarctic research slang: a baffling array of words that mean little to those from the outside world. Perhaps surprisingly, some of these words have nothing to do with science, or Antarctica. 

"There is a weird, nuanced vernacular that people develop when you're down there," says Clark. "If it is a nice day, you have a 'dingle day' or if you are going out to pick up rubbish, you are doing a fod plod. You pick it up quickly and it becomes very normal." 

Even so, Antarctica is still some way from the kind of accent divergence that occurred following the colonisation of North America, Australia and New Zealand.

"For accents to develop to the point where they are noticeable, it really takes a generational change," says Harrington. "Children are very good imitators, so that process of memorising each other's speech is magnified in children. If the winterers were to have children, like the settlers on the Mayflower when they went to America – the accent would become more stable."

A sudden rush of pregnancies in one of the most inhospitable places in the world is unlikely to be something the British Antarctic Survey would encourage (nor do other bases on the continent).

But on the other hand, it would certainly give the winterers something else to talk about other than the weather.

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