Imagine you are at a cocktail party. The room is crowded, people are coming and going, and you can barely hear your friend as they tell you some juicy gossip about the date they went on last week.

The fact you can still follow what their saying is down to your brain performing some very complex operations amid all the noise. Out of all the sound waves reaching your ears, it is successfully isolating the one of interest while filtering out the rest.

Trying to understand how the brain does this has kept auditory neuroscientists occupied since the 1950s, when British cognitive scientist Colin Cherry first coined the term “the cocktail party problem”.

This was initially studied in experiments that asked volunteers to listen to two speeches simultaneously – but only repeat one of them aloud afterwards. Cherry found that listeners could follow and repeat the pre-selected message remarkably well, despite both speeches being played simultaneously, one in each ear. In contrast, they recalled very little of the other message.

These experiments laid the foundation for decades of selective attention research. But it is only in the past 15 years that scientists have studied this phenomenon in experiments that more closely resemble the complicated, multi-layered way we listen in the real world – using technology that accurately tracks the brain’s activity as speech unfolds.

The most common non-invasive option, electroencephalography (EEG), uses what looks like a swimming cap fitted with small sensors. These measure very fast changes in the electrical activity of populations of neurons (the brain’s nerve cells) with millisecond precision.

In a 2014 study, neuroscientists found that, within 200 milliseconds of hearing someone speak, the brain favours the conversation someone is focusing on over all other noise. This prioritised attention shows up most markedly in secondary brain areas such as the superior temporal gyrus, which are responsible for piecing together the sounds we hear into meaningful speech.

This suggests that our attentive brain is not just enhancing the voice of who we are listening to, but helping us make sense of their words while filtering out all other conversations and background noise.

Attention switching

The original cocktail party problem did not investigate the full range of people’s listening experiences, which are often much less static. In everyday life, we repeatedly switch and reorient our auditory attention – for example, when hearing our name called across a crowded room, or when a door slams.

But what happens in that brief moment when we stop listening to one person and turn our attention to another? Can the brain switch from one voice to another instantly, or does it briefly have to process both? These were questions we investigated in our latest study with colleagues from the Eriksholm Research Centre in Denmark, which is funded by Danish hearing aid manufacturer Oticon.

Clarifying how the brain manages these rapid shifts in attention can help explain why some conversations are easy to follow while others become difficult, especially in noisy environments.

Coming back to the cocktail party: here you are, focused on your friend’s voice as they reveal the identity of their recent date. But then another familiar voice suddenly reaches your awareness. Your partner is (secretly) telling a friend about the surprise birthday gift they are planning for you. Your attention immediately shifts to your partner’s voice, while still giving the appearance of listening to your friend.

When we tested such a scenario in our laboratory, we found something striking. During this attention reorienting, the brain does not simply drop one voice and turn to the other. Rather, for a short period of between one and two seconds, the neural signals associated with the two voices overlap. In other words, the brain starts tuning into the new speaker before it has completely let go of the old one.

This mechanism may help explain how we navigate the constantly changing soundscape around us, moving our attention from one voice or sound to another while maintaining enough information about the previous speaker to make that transition seamless. This efficient processing strategy could be described as the brain maintaining a smooth “attention continuum”.

Improved hearing aid design?

These insights have some important real-world applications. For example, traditional hearing aids are often designed to favour sounds coming from in front of the listener, which is obviously limiting in many situations.

But using enhanced these attention decoding techniques, hearing aids could be neurally steered not only to enhance the speaker that is currently attended to, but to switch between different speakers, almost in real time, as the listener’s attention is dynamically reoriented.

More generally, understanding how the brain shifts, maintains and combines information from different speakers can give us a clearer picture of how attention shapes what we ultimately hear, understand and remember.

The approach introduced in our study could be particularly useful for studying how individuals vary in their attentional strategies, particularly in noisy environments – and for relating these differences to the mental effort they use to follow and understand speech.

Ultimately, this brings us closer to understanding how the brain makes successful communication possible – at cocktail parties and everywhere else.

Sara Carta received funding from the William Demant Fonden and Taighde Éireann – Research Ireland.

Giovanni Di Liberto receives funding from William Demant Fonden and Taighde Éireann – Research Ireland. He is also supported by Research Ireland at ADAPT, the Research Ireland Centre for AI-Driven Digital Content Technology at Trinity College Dublin.

Imagine it’s the dead of night. Your phone pings with a text – it’s a government emergency alert: “Leave your home immediately! Only take with you enough supplies for the next three days.” What would you want in your go-bag?

Our new survey of UK adults (results not yet published) has found a surprising number of people prioritised sentimental belongings such as a childhood teddy bear.

In the face of climate change and growing geopolitical instability, governments have started to advise citizens to prepare now for disaster. In 2024, the UK government launched its Prepare initiative. This was followed by preparEU, a flagship EU project which argued: “Today’s threats are fast, complex and interconnected; our response must be more proactive.”

These initiatives typically recommend that people should have enough food, water and medicine to last 72 hours. In addition, they need ready access to documents, cash, batteries or power banks and a wind-up radio, plus a working knowledge of emergency support in their local area.

But when that message pings in the night, will you already be packed, with documents, food and medicine in a go-bag? Or will you be scrambling to find things, hoping you have enough essentials to keep you going?

In April 2026, as part of the After the End project – a Wellcome Trust-funded research project exploring how people experience and recover from crises – we surveyed 1,000 UK adults to understand how prepared they were for a sudden crisis or disaster.

We found that most people have less than half of what is recommended by the UK government and the US Federal Emergency Management Agency. Only four out of 1,000 people reported being fully prepared.

Our findings echo the 2025 UK Public Survey of Risk Perception, Resilience and Preparedness, which found that of 10,536 adults, only 13% felt largely or totally prepared.

Withstanding the emotional toll of crisis

However, the focus on practical items and supplies may not capture what people need to withstand the emotional toll of crisis and disaster.

When asked what other items they would take with them during a crisis, many participants felt that personal items would be critical to their post-disaster wellbeing. They expressed a strong desire to keep sentimental items such as jewellery, family photographs and objects from their childhood close to them during crisis.

As one participant wrote: “My childhood teddy bear. He is going to the grave with me. Apart from that, nothing matters much.”

Pets also featured heavily in people’s responses. Animals such as cats and dogs were often described as members of the family. Some participants even found comfort in the idea of taking the ashes of deceased pets with them if they needed to flee in an emergency.

A concept in psychology called extended self theory explains why these types of items hold such importance during everyday life – and also during crisis. It suggests that our sense of self is fragile, and continually built and maintained through our connections with the world around us.

In this way, the things we surround ourselves with do more than serve practical functions. They help us construct, stabilise and make sense of our identity. Consciously or subconsciously, our possessions become part of who we are.

A childhood teddy bear, therefore, becomes a possession imbued with memories and emotions which tell a tale of who we are, where we have come from, and who we care about. Objects can reinforce continuity of identity over time and space.

A strong sense of self

Having a strong sense of self can be beneficial during times of crisis. If we enter such a period with a sense of identity that is stable and coherent, it can act as a psychological anchor. A strong identity helps us cope in a challenging situation, and reduces the likelihood of ruminating about negative experiences.

Research also suggests that our ability to connect with items from pre-disaster periods influences our ability to cope and recover psychologically following an emergency. So, salvaging photographs and other items of sentimental value during disaster could help to preserve and rebuild our memory and identity.

If everything around us falls apart, a treasured item can help us maintain some sense of normality. This is perhaps why survivors of the 2011 Japan tsunami frequently described the loss of family photos as one of their greatest emotional losses.

Sentimental items can maintain or even improve our belief that we are capable of achieving our goals. Psychologists refer to this as self-efficacy. And research suggests higher levels of self-efficacy are associated with greater preparedness for, and better coping after, a disaster – particularly in vulnerable groups such as those with disability.

Our analysis found that people who reported greater self-efficacy also said they had more of the items and knowledge recommended by the UK’s Prepare initiative.

Sentimental items can also help to rebuild communities. Heirlooms and meaningful everyday items from before a crisis become points of storytelling afterwards. So, remember to save a little space in your backpack for something that means something to you.

Whether it is a childhood teddy bear, your late mother’s engagement ring or a beer coaster from a first date, these items are more than just “things”. When so much else is uncertain, the small objects that remind us who we are may be among the most valuable items we can take with us.

Ruth Ogden receives funding from British Academy, the Wellcome Trust, the Economic and Social Research Council, CHANSE and Horizon 2020.

Anna Powell receives funding from the Wellcome Trust through the After the End Discovery Award, and from The Pandemic Institute through a partnership with CSL Seqirus UK.

Patricia Kingori receives funding from the Wellcome Trust through the After the End Discovery Award and the Antitheses Research platform.