Philippa Kaur

Unfamiliar voices seem to put the sleeping brain on alert in a way that familiar voices don’t

Humans

17 January 2022

By Jason Arunn Murugesu
Electroencephalography (EEG) is used to monitor brain activityShutterstock / NPS_87
The sleeping brain is more active if it hears unfamiliar voices rather than familiar ones. The finding suggests that we can process information about our environments even in the depths of sleep.
Manuel Schabus at the University of Salzburg in Austria and his colleagues monitored 17 people, with an average age of 23, in a sleep lab over two nights. Brain activity was monitored using an electroencephalography (EEG) machine.
“The first night was so that the subjects could get comfortable with their new environment,” says Schabus.Advertisement
During the second night, while the participants were asleep, they played an audio recording of human speech on loop. The voice was either unfamiliar to the sleeper or belonged to a familiar person, such as a parent or a romantic partner.
In either case, the voice repeatedly uttered three first names: two random but common names and the name of the sleeper. The audio recordings were played for four 90-minute periods during the night. There was a 30-minute gap between each audio recording so that it would be easier for people to stay asleep.
The audio was played at a volume so as not to wake the participants up. “We adjusted the sound levels individually,” says Schabus.

The researchers found that unfamiliar voices generated more brain activity in the sleepers than familiar voices. In particular, they found an increase in the number of K-complexes – a type of brainwave that is slow and isolated – when the subjects heard unfamiliar voices.
“K-complexes are interesting because they show the immediate response to a disturbance,” says Schabus. That response is divided into two parts, he says: first, the brain processes the information, then it inhibits the information so it doesn’t wake up the sleeping individual.
If the participant’s brain activity suggested that they were on the verge of waking up, the researchers lowered the volume of the recordings to help them stay asleep.
Schabus says it makes sense evolutionarily why unfamiliar voices generate stronger brain activity than familiar ones. “Unfamiliar voices should not be speaking to you at night – it sets off an alarm,” he says.
The finding may be part of the reason why we sometimes struggle to sleep in new environments, such as hotel rooms, says Schabus.
“This study shows that unfamiliar voices disturb sleeping people more than familiar ones,” says Julie Darbyshire at the University of Oxford. “We see these effects when hospital patients find it very hard to sleep.”
“Partly, this is because almost nothing in the environment is familiar. As well as unfamiliar voices, patients will also be surrounded by equipment with unfamiliar and unpredictable pings, bongs and beeps.”
Unfamiliar voices also triggered fewer K-complexes in the second half of the night compared with the first half. “It means we can learn something new in the near-unconscious state,” says Schabus.
But he notes that this doesn’t mean we can learn new words during sleep. “You need the night to sleep and rest and if you don’t sleep properly, it does more harm than good for learning,” he says.
Journal reference: Journal of Neuroscience, DOI: 10.1523/jneurosci.2524-20.2021

More on these topics: More

By Bencie Woll
Simone Rotella
Not so long ago, deaf children were punished in the UK for using sign language in the classroom. Recounting his experience in the 1960s, one deaf person told one of my colleagues many years later: “I had a lot of punishments for signing in classrooms… One morning at assembly, I was caught again, then ordered to stand at the front of the class. The headmistress announced that I looked like a monkey [and that she would] put me in a cage in the zoo so the people will laugh at a stupid boy in the cage.”
Thankfully, experiences like this are no longer as common. Sign languages have not only survived, but are now flourishing – so much so that many more people are getting the chance to learn them, which should be celebrated.Advertisement
British Sign Language (BSL) is used by tens of thousands of people in the UK, including around 90,000 deaf signers. For some of them, such as children with deaf parents, it is the first language they acquire. In the US, more undergraduate and graduate students have enrolled on courses in American Sign Language (ASL) than German each year since 2013.
Currently, the UK Department for Education has a draft BSL curriculum for England on its desk for GCSE students (14 to 16-year-olds), which could come into effect later this year. This would make it a modern language option alongside French, German, Spanish and Chinese. Both Scotland and Wales have BSL curricula in the works too.
Elsewhere, sign languages are gaining both recognition as official languages and a place on the national curriculum. South Africa has hired 60 instructors to teach South African Sign Language as part of a state-run adult literacy programme, and Jamaican Sign Language was introduced into Jamaica’s national curriculum earlier this month.
That sign languages are thriving should be welcomed for many reasons, including the cognitive benefits that learning them brings. Several studies have found that hearing people who learn sign languages perform better in tasks requiring spatial transformation abilities – which you might use when taking down directions. Space is an integral part of the grammar of a sign language, with verbs, nouns and pronouns using the space in which they are located as part of their meaning. A series of experiments by Mary Lou Vercellotti at Ball State University in Indiana also found that adult ASL students have enhanced face-processing skills, which are essential to reading emotions.
Learning a sign language can be enlightening, too. In a year-long study of preschool children by Amy Brereton at Trinity Washington University in Washington DC, hearing children who were learning ASL attained a greater appreciation of cultural diversity, as determined via classroom observations and interviews.
Part of the beauty of learning languages – both spoken and sign – is that you don’t need to be fluent to experience the benefits. In a recent British Academy project I led with my colleague Li Wei at University College London, we highlighted how learning languages shapes the mental functions you use in a range of other fields, from your social awareness to your creativity and grasp of mathematics.
Sign languages today are rich with communities and culture. Up until the 1980s, many deaf people essentially had to exist in the 19th century: no telephones, no radio, no television. But in many countries, social clubs, networks and advocacy groups for deaf signers have given rise to a diverse range of vernaculars. With the internet and social media platforms like Instagram and TikTok, content creators are now sharing these with the world, bringing greater awareness and respect – and increased interest in learning these languages.
Bencie Woll is a professor of deaf studies at University College London

More on these topics: More

By Elle Hunt

CHASTENED by the sight of her newborn baby’s face lit up by the blue light of her phone, Catherine Price set about limiting the time she spent in front of screens. The journalist and her husband stopped mindlessly scrolling on social media and started taking 24-hour “digital sabbaths”.
By cutting down on her screen time, Price found that she had gained hours in her day – but now, she struggled to know how to pass them. What was missing from her life, she realised, was fun. But what was fun, if not bingeing on Netflix and playing games on her phone?
Price has form in turning “personal issues into professional projects”. Her previous book, 2018’s How to Break Up With Your Phone, was the result of her attempts to quell her overuse. With that problem more or less in hand, she decided to investigate what fun was, so that she could fill her life with more of it. The result is The Power of Fun, a practical guide with lessons for all of us, especially as we live through a decidedly not-fun pandemic.
This new book is a kind of spiritual sequel to How to Break Up With Your Phone, providing answers to the question of how to replace an all-encompassing habit.
Price comes up with a definition of the most satisfying type of fun, what she calls “True Fun”: typically a serendipitous experience that brings together “playfulness, connection and flow”, adding a dose of much-needed meaningful engagement to our lives.
It is this confluence of factors, Price argues, that distinguishes the most exhilarating, restorative fun from something fleeting and somewhat superficial, like getting a pedicure or going out to a bar.
That said, less-sophisticated fun isn’t just a frivolous activity that we can simply do without. It, too, can serve as an antidote to stress, making it vital for our physical and psychological well-being.
Price gives examples of True Fun from her own life, such as singing in the car with friends and learning guitar and playing in a group. “There is a reason that our moments of True Fun stand out in our memories: True Fun makes us feel alive,” she writes.
As for how to get more of it, Price found it isn’t as simple as just spending less time on screens, or trying to squeeze more activities into schedules that are already stretched thin. In fact, it often involves doing less: prioritising rest or sleep, for instance. Or it might mean coming up with a plan to ensure that household tasks or childcare are shared evenly to make room for moments of pleasure and serendipity.
Price draws from the science of positive psychology in her quest to have more fun, but rigorous research takes a back seat to her own exploration and the findings of her Fun Squad: a global group of about 1500 people that Price recruited from her newsletter subscribers and invited to share their fun-seeking exploits.
Including less from this somewhat self-selecting group and adding more on new psychological research would have helped to bolster the book’s scientific standing. However, this might have come at the expense of its practical relevance. The strength of The Power of Fun is that it is approachable, anecdotal and inviting. After two years of living through a pandemic, many of us have spent more than enough time trying to force fun into our lives (Zoom quiz anyone?).
“True Fun’ is typically a serendipitous experience that brings together playfulness, connection and flow”
The success of Price’s self-experimentation provides motivation to at least try to seek out more activities that we actually take pleasure in. And her main point, that we should clear space in our lives for the things that truly mean something to us, is a sound one.
Price quotes the author Michael Lewis: “If you get in the habit of life not being fun, you start to not even notice.” Once you have noticed and, more importantly, taken action, there is plenty of fun out there for the taking. Why waste your time on anything else?

More on these topics: More

By Sally Adee

Even a post-apocalyptic Earth retains a certain charm for humankindgremlin/Getty Images
Goliath
Tochi Onyebuchi
TordotcomAdvertisement

SCI-FI dystopias of a ruined Earth are thick on the ground these days, filled with the wreckage of climate change: drowned continents, great extinctions and air that is no longer safe to breathe. In the more hopeful, people leave the planet in search of another world where they can start again, with lessons learned and a determination not to repeat the same mistakes.
In Tochi Onyebuchi’s Goliath, human nature is eternal. So, while the rich predictably leave for pristine space colonies, abandoning those who can’t afford to escape, there is money to be made from tourism to the ruins left behind. Some tourists find themselves captivated by the communities that have emerged, and decide to return to Earth. Gentrification ensues.
The premise is wry and au courant. In a lesser writer’s hands, it could lead to lazy and cynical caricatures, but Onyebuchi uses it only as a jumping off point into a deeper examination of the idea of home, and what we will do to get there.
Onyebuchi started out writing sci-fi for young adults before reaching a wider audience with the multi-award gobbling novella Riot Baby in 2020. He has a master’s degree in screenwriting, which is on vivid display in his hypnotic descriptions of Goliath’s two new human worlds.
We explore these through the eyes of several characters, including colony-dweller Jonathan, who looks out into star-spangled black space from a window in a sterile space station straight out of Stanley Kubrick’s 2001: A Space Odyssey. On Earth, we meet Sydney, who watches a dandelion’s seeds get nibbled away by wind under a poisoned red sky.
“By detailing the two worlds, Onyebuchi makes it obvious why people start yearning for Earth”
The style is more than matched by the substance of the story, in which Onyebuchi takes his time to explore the main themes. The gentrification issue, for example, is treated not as an easy punchline but as a way into deeper questions about what we need.
When Jonathan travels from the colonies to Earth, he tours destroyed homes looking for one to fix up. Onyebuchi shows us what he starts with – a shell of a house filled with geological layers of detritus. Then, months later, Jonathan is accepted into the community, which allows him to connect to the lone cable still bringing electricity to the neighbourhood. His wonder and joy at something so ordinary as a working light switch is infectious, especially after the technological marvels he has been taking for granted in the colonies.
By detailing the contrasting textures of the two worlds, Onyebuchi makes it obvious why colony-dwellers start yearning for Earth. Home inspires such longing that people living in the clean, metallic colonies pay handsomely for individual bricks to be salvaged from demolished houses on Earth and sent into space. They fight on auction sites for tiny cacti.
Back on Earth, there are different tensions. Returning residents bring back things that Earth’s citizens were only too happy to see the back of, not least social inequality. Even in space, the richest live in the part of the space station with a view of the galaxies, while everyone else faces the unrecyclable detritus – including dead bodies – that surrounds the colonies in a ring.
What will the prodigal Jonathans bring back to Earth apart from their longing for home? And will the people they left behind be interested in anything they have to offer?
Sally also recommends…

More on these topics: More

Read
Spark is medical physicist Timothy Jorgensen’s story of electricity as an essential force in biological life. It features tales of game-changing historical discoveries and the latest uses of electricity in medicine.
blickwinkel/Alamy
Watch
The Case for Conservation Optimism is made by conservationist Martin Harper in this online talk from the Linnean Society of London at 6pm GMT on 20 January. We can prevent extinctions, he argues, if we take the right action now.Advertisement

Read
The Anomaly by Hervé Le Tellier sold a million copies and won the Prix Goncourt in its original French-language edition. Now translated, it is an ingenious sci-fi thriller about an Air France flight that enters a storm and is changed forever.

More on these topics: More

By Gege Li

HAVE you ever become angry about something that, in hindsight, had more to do with the fact that you were having a bad day? Most of us have had moments like this, where we let our emotions get the better of us or allow them to influence our decisions. It isn’t necessarily ideal, and we often assume that the involvement of emotions – intended or otherwise – is always detrimental to our ability to make good choices.
Not so, says physicist and author Leonard Mlodinow in his book Emotional: The new thinking about feelings. He argues that while it might seem like getting emotional is a bad idea, our feelings actually play an essential role in shaping our thoughts and decisions, helping us to react flexibly to situations and motivating us to pursue our goals.
Drawing on the latest research, Mlodinow guides us through the ways in which neuroscientists are changing their understanding of human feelings – what he calls “the emotion revolution”.
One of the breakthroughs in the science of emotion is the finding that rational thought alone isn’t enough to process the masses of information that we are exposed to in our environment. To think effectively, we also need to feel. “Emotion is not at war with rational thought but rather a tool of it,” writes Mlodinow.
This challenges two well-worn assumptions laid out long ago by some of history’s greatest thinkers, such as Plato: that the human mind can be split into rational and non-rational parts, reason and emotion, and that harnessing the former while taming the latter holds the key to success and making good decisions.
But now that we have the technology to probe the human brain more deeply than ever before, modern science is uncovering the complex neural dynamics that are involved in generating our emotions, and in turn reshaping our knowledge of their importance.
Mlodinow explores how and why feelings evolved in the first place, arising initially from purely reflexive behaviours to environmental stimuli before the “upgrade” of emotion occurred, which provided a more flexible and effective way for organisms to react to the challenges they encountered.
The research also illustrates the universality of emotion and its benefits – scientists have seen emotion-guided behaviours at play in not only humans, but also rodents, fruit flies and bees.
Towards the end of the book, readers are given the chance to determine and reflect on their own emotional profile, using various questionnaires that were developed for research into specific feelings like happiness and anxiety. This is one of the more provocative elements of the book: the idea that we can gain power over our emotions by learning to understand and navigate them better. It is a tantalising concept that Mlodinow backs up with numerous studies and anecdotes. He also gives advice on how we can better manage our own emotions and gain more control over our lives.
Though the message of controlling your feelings to ultimately improve your well-being is an important one, it did get repetitive at times. What’s more, regular readers of New Scientist or of popular neuroscience in general may find the research and the solutions Mlodinow offers, such as meditation and exercise, to be a little predictable.
Emotional may occasionally seem like a self-help book, but it is nevertheless an illuminating read that deals well with the complexity of emotion, the emerging science behind it and the fascinating workings of the brain itself. It might just help you remain calm and collected, even on a bad day.

More on these topics: More