Article
Culture
Psychology
Weirdness
5 min read

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.
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. 

Column
Culture
Digital
Film & TV
Justice
4 min read

Data scientists should stop watching Minority Report and start watching The Shawshank Redemption

A justice ministry’s prejudicial database leaves no room for redemption.

George is a visiting fellow at the London School of Economics and an Anglican priest.

Tom Cruise gestures with his fingers in an e-glove in front of his face
Tom Cruise takes the measure.
20th Century Fox.

The go-to for any news item about using AI to predict crimes before they happen is Steven Spielberg’s Minority Report from 2002, starring Tom Cruise as a futuristic cop, who employs human “precogs” as clairvoyants to get ahead of the villains. 

So, I’m far from the first to name-check it as showing the dystopian future that the UK’s Ministry of Justice heralds with its test project to “explore alternative and innovative data science techniques to risk assessment of homicide.” 

That use of “homicide”, rather than the more British “murder”, is telling, almost like the Ministry wonks have just watched the movie. The pressure group Statewatch has no doubt where they’re heading, with data being used on people who may never have been convicted of an offence and “will code in bias towards racialised and low-income communities.” 

Spielberg was always ahead of the curve. But my fear is less the chilling dystopia that Statewatch sees in its precog. Actually, I’m more worried about the past in this context, or rather in how we treat the past. 

If I haven’t to date done anything wrong, then I have committed no offence. I am literally innocent. And that’s an absolute. An interpretation of data that indicates that I’m more likely to commit a crime than others is neither here (in my conscience) nor there (in the judicial system). 

Furthermore, there’s a theological point. If it is so, as we’re told, that no one is without sin, then we’re all culpable in the pasts that we have lived so far, but the future contains all we have to play for.  

To suggest that some of us are more likely to screw up in that future than others is very dangerously deterministic. It’s redolent of Calvinism’s doctrine of the “elect”, those who have already been marked for salvation and eternal bliss, regardless of what they do or don’t do in this life, while the rest of us, however virtuous our mortal deeds might be, will rot in hell. 

Neither Calvin’s determinism nor the Ministry of Justice’s prejudicial database leave any room for redemption. They’re just trying to identify events that will definitely (the former) or are likely to (the latter) happen. Conversely, we live in hope (for some of us a sure and certain hope) of a future in which we can be redeemed, whatever we have done in the past. 

And that’s why I find Minority Report an unsatisfactory analogy for the development of real-life precrime technology. It is a film that is only about determinism, which leaves no room for either free-will or redemption. And that’s applying a form of intelligence that is truly, er, artificial. 

The vital thing is that hope is fulfilled, the prisoners make it to their paradise after worthless lives spent in jail. Justice is seen to be done.

A more helpful movie, richer in its development of these themes – and not just because it’s got the word that I favour in its title - is 1994’s The Shawshank Redemption, based on a novel by Stephen King. Here we have the idea explored that the past isn’t only irrelevant to our futures, but doesn’t even really exist in time in relation to the future. 

It’s bursting with more religious themes even than Clint Eastwood’s spaghetti westerns, which are really only the righteous saviour turning up to defend flawed goodies from evil baddies, again and again. For a start, The Shawshank Redemption is set in a prison, where whole lives are spent atoning for crimes that have or haven’t been committed. See? 

Lifers who are released after decades struggle to cope or kill themselves. The central character, a messianic figure, lives in hope with his convict friend of reaching a beach in the Virgin Islands, while the prison warden describes himself as “the light of the world”, but is assisted by his prisoners in money-laundering – washing clean – his ill-gotten gains. 

I could go on. But the vital thing is that hope is fulfilled, the prisoners make it to their paradise after worthless lives spent in jail. Justice is seen to be done. But the important thing here is that there is no pre-crime determinism. The future, which often looks hopeless, is rolling out towards the possibility of redemption, which ultimately becomes the only certain reality. 

One can dwell on movie plots too long. They are only, if you’ll excuse the pun, projections of life. But it is nonetheless irritating both that a government department with Justice in its title can believe it worthwhile to explore how it might deploy AI to predict who tomorrow’s criminals are likely to be and its critics condemn it by using the wrong dramatic analogies. 

Minority Report was a dystopian thriller that suggests that the future can only be changed by human intervention. The Shawshank Redemption showed us that inextinguishable human hope is in a future we can’t control, but can depend on.     

Anyone who is interested in justice, especially those who work in a ministry for it, might benefit from downloading it.  

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