Why smell jumps the queue when it comes to memories

Smells hardwire deep into the brain, writes Henna Cundill, as she explores why they jump-start such vivid memories.

Henna Cundill

Henna is a researcher with the Centre for Autism and Theology at the University of Aberdeen.

An autumnal scene of a church yard and church framed by leafless trees.

'The smell of dust and damp stone will always cry “safety!”'

Jakub Pabis on Unsplash.

When I was a 22-year-old undergraduate my mother died quite suddenly. I can't remember the name of the undertakers we used, nor the chaplain who took her funeral. I can no longer visualise what any of their faces looked like. I know I visited the chaplain’s house to plan the funeral, but I can't remember exactly where that house was. What sticks is that the day of the funeral was a sultry summer's day, and both the chaplain and the undertakers smelt of perspiration. To this day there are moments where I catch that same whiff of man-sweat in some other location, and for a fleeting second, I am a bewildered 22-year-old once more.

Here is another memory. I attended a tiny, rural Church of England primary school in the middle of England. At the end of each school year, all of us donned our little Wellington boots, which smelt faintly of slurry (since this was dairy-farming country) and sweaty feet. Then we lined up in a crocodile and trudged through the bluebell-wood (damp leaves) and skirted the edge of fields (silage, which stings the nose) covering the mile or so between our school building and the village church.

We would enter the church grounds through the back field, hurrying through an eerily muffled graveyard with tombstones towering far above our heads and the grass disturbingly lumpy beneath our little feet. To the chidings of “Quickly!” and “Quietly!” we children scurried down a gravel path, away from this unsettling place of death, to reach the cool sanctuary of a little church, and the comforting smells (for me, at least) of damp stone and dusty hymnbooks.

Others may not have the same associations, but for me the smell of dust and damp stone will always cry “safety!” and the reassurance that “there are no ghosts in here!” in contrast to that troubling graveyard. From death to life. Yet, at the same time, getting stuck with my nose close to some man’s whiffy armpit on the Tube will forever insinuate that I am just a child pretending to be a grown-up, out of my depth, overwhelmed with one thousand decisions to make (“What flowers do you want for her coffin?”) and no-one to advise. In the midst of life, death again.

On reflection I will know that my emotions are being manipulated by my nose, in ways which are more or less than helpful depending on the circumstances.

Of course, I am not 22 years old and lost anymore, no matter what that man’s armpit tries to tell me. My rational mind knows better, but my rational mind doesn’t get a say – or doesn’t get the first say anyway. This is because smell is the only one of our senses that bypasses the thalamus (the brain’s ‘filtering gate’ that decides which part of the brain needs to respond to sensory input) and goes straight to the limbic system, where emotional memory is stored.

Sometimes it is very obvious that this is taking place, such as in the examples given above. On reflection I will know that my emotions are being manipulated by my nose, in ways which are more or less than helpful depending on the circumstances. But it can happen in more subtle ways too. Supermarkets infamously pump out smells to influence our buying choices, and we’re trying to sell our house right now, so we’ve been brewing a whole lot more coffee than we ever usually would.

Intriguingly, scientists don’t really know why the human sense of smell jumps the queue when it comes to cognitive processing. There are biological theories, such as that the smell of predator could wake up our ancestors while they were sleeping and/or could allow them to follow a scent trail quickly when fleeing danger or seeking food. There are social theories too, such as that we don’t have a lot of good words to describe smells, so the brain just doesn’t bother trying to analyse them. Whatever the truth of the matter, the reality is that (whether we like it or not) our noses are an emotional trip-hazard.

When I walk through those great oak doors there is a moment, a glitch in the matrix, when the unmistakable smell of church hits my nose. Dust, damp… a little hint of mouse.

I can’t help wondering what this tells me about my religious practice. Do I go to church because I have made a cognitive decision to worship God each Sunday? Or do I go to church because I am following my nose, getting away from a world full of armpits and responsibilities to a place where I am a seven-year-old girl, all gingham dress and wellies, feeling safe. If so, does it matter?

Truth is, my mind can give me a dozen reasons not to go to church every single week. In fact, two dozen reasons. More. It has always been a busy week; I’m always behind on work. The house always needs a sort out and the car is never washed. But because certain congregation members are normally counting on me for certain things, and because I’m still pretending to be a grown up, I typically drag myself out the door, and off to church I go.

And week on week, without fail, when I walk through those great oak doors there is a moment, a glitch in the matrix, when the unmistakable smell of church hits my nose. Dust, damp… a little hint of mouse. My body registers this before my mind; my shoulders drop a little of their tension. Even if it’s just for a fleeting moment, I start to feel that I know for sure what is absolutely real in my life and what is just pretend.

Is this knowledge irrational – since it doesn’t come from the cognitive part of my mind? Or is there a God who knows that the cognitive part of my mind sometimes tells me all sorts of untrue and unhelpful things. Is there a God who is choosing to reach out to me in more subtle, more ancient ways?

I can only wonder if I have been following my nose all this time, without even noticing. Drawn along by an ancient scent trail that leads me time and time again…this way…and that way…until I reach a place where there is safety, and bread.

Explainer

Creed

Psychology

Trauma

7 July 2023

4 min read

Thoughts and prayers: why such words can really count

Cop-out phrase or the key to articulating something more powerful, Henna Cundill dissects the neurological power of a platitude.

Henna Cundill

Henna is a researcher with the Centre for Autism and Theology at the University of Aberdeen.

A Coast Guard officer gives a press conference while looking grim-faced. Others look on.

A Coast Guard office gives the news of the loss of the Titan submersible crew.

“Our thoughts and prayers are with all those affected...”

We hear that repeated often enough, don’t we? Some public figure is quoted as saying this phrase in the body text (usually about paragraph five) beneath nearly every gut-wrenching news headline. “Thoughts and prayers” are the panacea, the platitude, the words to say when there is nothing that can be said.

It's easy to deride and dismiss these words, and many do. There is an understandable frustration when public figures serve suffering people with vapidity instead of vim. But perhaps I can make a case for “thoughts and prayers” being more than just a political cop-out? To be sure, these words are not everything, but they are something.

I love words, that’s why I try to write for living. (Try to, anyway.) I love languages too; I’m one of those annoying people who finds learning new languages pretty easy. Lots of people think they are rubbish at this, but they have missed the secret weapon: repetition. If you’ve the willingness to dig in and repeat vocab lists and word tables over and over again, and then over and over again, and then all over again. And then again. And then again, again… then learning a new language is easy. Repetition is the key, because repetition forges and reinforces new neural pathways in the brain.

You see, that’s the exciting thing about learning a new language: you can actually feel the incredible plasticity of the human brain in action. It doesn’t have to be a new language, you can mess with the language you already know – I promise that if you look at a car and say the word “bicycle” to yourself 100 times, the next time you see a car, you will likely have to consciously will yourself not to call it a “bicycle”. Go ahead, try it. (Car) bicycle, (car) bicycle, (car) bicycle … and repeat.

The human brain is constantly linking words and phrases to objects, emotions and perceptions, grouping things together by association. One study showed that participants were quicker to verbalise the word “priest” in response to a photo of a man in a dog collar when they had been shown a picture of the Pope immediately before. This is because the brain stores words in categories of related things, and this language storage system then has the power to shape what we perceive. Due to the association with the Pope, the participants perceived a “priest” and not a “vicar” or a “minister” or even just a “man.”

Think again about the word ‘bicycle’ – in your mind’s eye do you now also see a car? See, I’ve played a trick on you! If you saw the car, then I’ve gifted you a new (and, sorry, totally useless) neural connection between the word bicycle and the object car. You’ll probably unlearn this one pretty quickly – neural pathways can fade as well as develop. But philosophers have long pondered this strange power of language to create our sense of reality – we develop our perception of what exists based on what we can communicate. Put more simply: people generally pay attention to the objects and perceptions that they have words for, and often ignore the things for which they have no words at all.

Having something to say about suffering that gives us the ability to pay attention to it, to perceive and acknowledge it.

Of course, there are no words at all for that feeling one gets when reading about a school shooting, or a natural disaster, a mass murder or an accident. Horror is a screaming silence. “Our thoughts and prayers…” are typically the words to say that we have no words, that we are powerless to articulate what’s going on inside when we look upon the dust and ashes. But, if we take the philosophers seriously, and if we acknowledge the plasticity of the human brain, then putting these words around an event creates certain neural links and associations. It is having something to say about suffering that gives us the ability to pay attention to it, to perceive and acknowledge it, even when we would rather ignore and turn away.

And if you or I actually do think, and if you or I actually do pray for all those affected – especially if we are willing to do so again and again, and then all over again, well then, we have not only created a neural pathway, but we have also reinforced it. We have gifted those suffering people a little place in our minds – perhaps even a permanent corner of existence. They are perceived, seen, and if you have ever been in a place of suffering, you’ll know how much it matters that someone, anyone, pays attention.

Far from helping us to avoid reality, having something to say gives us the means to engage.

Perhaps this is why the Bible repeatedly emphasises the importance of praying for one another, and for the world, and even for one’s enemies? It’s not only that prayer works on God, but that prayer works on us – developing our plastic brains and increasing our capacity to pay attention, to perceive the suffering of others and to allow horror to birth compassion. Far from helping us to avoid reality, having something to say gives us the means to engage.

I am by no means arguing for platitudes instead of political power. Words are no substitute for tighter gun-control, better public safety, standards in public office and/or an open-hearted, open-walleted, boots-on-the-ground humanitarian response. Words are not a panacea, but neither are they powerless. Philosophers and prophets alike have long pondered the mystery that thoughts and prayers create realities – advances in neuroscience have only served to confirm the wisdom that was already in the room. To think and to pray is to create, to speak words that will bring life and breath out of dust and ashes.