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Now you see it, now you don't: what optical illusions tell us about our brains

Illusions can offer insights into how the visual system processes images.

Maurits Escher: where do the staircases lead?

The human brain is a network of about 20 billion neurons – nerve cells – linked by several trillion connections. Not to mention glial cells, which scientists used to think were inactive scaffolding, but increasingly view as an essential part of how the brain works. Our brains give us movement, language, senses, memories, consciousness and personality. We know a lot more about the brain than we used to, but it still seems far too complicated for human understanding.

Fortunately, the brain contains many small networks of neurons that carry out some specific function: vision, hearing, movement. It makes sense to tackle these simple modules first. Moreover, we have good mathematical models of nerve cell behaviour. In 1952, Alan Hodgkin and Andrew Huxley wrote down the “Hodgkin-Huxley equations” for the transmission of a nerve impulse, which won them the 1963 Nobel Prize in Medicine. We also have effective techniques for understanding small networks’ components and how they are linked.

Many of these simple networks occur in the visual system. We used to think that the eye was like a camera, taking a “snapshot” of the outside world that was stored in the brain like a photo stuck in an album. It uses a lens to focus an image on to the retina at the back of the eye, which functions a bit like a roll of film – or, in today’s digital cameras, a charge-coupled device, storing an image pixel by pixel. But we now know that when the retina sends information to the brain’s visual cortex, the similarity to a camera ends.

Although we get a strong impression that what we are seeing is “out there” in front of us, what determines that perception resides inside our own heads. The brain decomposes images into simple pieces, works out what they are, “labels” them with that information, and reassembles them. When we see three sheep and two pigs in a field, we “know” which bits are sheep, which are pigs, and how many of each there are. If you try to program a computer to do that, you quickly realise how tricky the process is. Only very recently have computers been able to distinguish between faces, let alone sheep and pigs.

Probing the brain’s detailed activity is difficult. Rapid progress is being made, but it still takes a huge effort to get reliable information. But when science cannot observe something directly, it infers it, working indirectly. An effective way to infer how something functions is to see what it does when it goes wrong. It may be hard to understand a bridge while it stays up, but you can learn a lot about strength of materials when it collapses.

The visual system can “go wrong” in several interesting ways. Hallucinogenic drugs can change how neurons behave, producing dramatic images such as spinning spirals, which originate not in the eye, but in the brain. Some images even cause the brain to misinterpret what it’s seeing without outside help. We call them optical illusions.

One of the earliest was discovered in Renaissance Italy in the 16th century. Giambattista della Porta was the middle of three surviving sons of a wealthy merchant nobleman who became secretary to the Holy Roman emperor Charles V. The father was an intellectual, and Giambattista grew up in a house in Naples that hosted innumerable mathematicians, scientists, poets and musicians. He became an outstanding polymath, with publications on secret codes (including writing on the inside of eggshells), physiology, botany, agriculture, engineering, and much else. He wrote more than 20 plays.

Della Porta was particularly interested in the science of light. He made definitive improvements to the camera obscura, a device that projects an image of the outside world into a darkened room; he claimed to have invented the telescope before Galileo, and very likely did. His De refractione optices of 1593 contained the first report of a curious optical effect. He arranged two books so that one was visible to one eye only and the other to the other eye. Instead of seeing a combination of the two images, he perceived them alternately. He discovered that he could select either image at will by consciously switching his attention. This phenomenon is known today as binocular rivalry.

Two other distinct but related effects are impossible figures and visual illusions. In rivalry, each image appears unambiguous, but the eyes are shown conflicting images. In the other two phenomena, both eyes see the same image, but in one case it doesn’t make sense, and in the other it makes sense but is ambiguous.

Impossible figures at first sight seem to be entirely normal, but depict things that cannot exist – such as Roger Shepard’s 1990 drawing of an elephant in which everything above the knees makes sense, and everything below the knees makes sense, but the two regions do not fit together correctly. The Dutch artist Maurits Escher made frequent use of this kind of visual quirk.

In 1832, the Swiss crystallographer Louis Necker invented his “Necker cube” illusion, a skeletal cube that seems to switch its orientation repeatedly. An 1892 issue of the humorous German magazine Fliegende Blätter contains a picture with the caption “Which animals are most like each other?” and the answer “Rabbit and duck”. In a 1915 issue of the American magazine Puck, the cartoonist Ely William Hill published “My wife and my mother-in-law”, based on an 1888 German postcard. The image can be seen either as a young lady looking back over her shoulder, or as an elderly woman facing forwards. Several of Salvador Dalí’s paintings include illusions; especially Slave Market With the Apparition of the Invisible Bust of Voltaire, where a number of figures and everyday objects, carefully arranged, combine to give the impression of the French writer’s face.

Illusions offer insights into how the visual system processes images. The first few stages are fairly well understood. The top layer in the visual cortex detects edges of objects and the direction in which they are pointing. This information is passed to lower layers, which detect places where the direction suddenly changes, such as corners. Eventually some region in the cortex detects that you are looking at a human face and that it belongs to Aunt Matilda. Other parts of the brain are alerted, and you belatedly remember that tomorrow is her birthday and hurry off to buy a present.

These things don’t happen by magic. They have a very definite rationale, and that’s where the mathematics comes in. The top layer of the visual cortex contains innumerable tiny stacks of nerve cells. Each stack is like a pile of pancakes, and each pancake is a network of neurons that is sensitive to edges that point in one specific direction: one o’clock, two o’clock and so on.

For simplicity, call this network a cell; it does no harm to think of it as a single neuron. Roughly speaking, the cell at the top of the stack senses edges at the one o’clock position, the next one down corresponds to the two o’clock angle, and so on. If one cell receives a suitable input signal, it “fires”, telling all the other cells in its stack: “I’ve seen a boundary in the five o’clock direction.” However, another cell in the same stack might disagree, claiming the direction is at seven o’clock. How to resolve this conflict?

Neurons are linked by two kinds of connection, excitatory and inhibitory. If a neuron activates an excitatory connection, those at the other end of it are more likely to fire themselves. An inhibitory connection makes them less likely to fire. The cortex uses inhibitory connections to reach a definite decision. When a cell fires, it sends inhibitory signals to all of the other cells in its stack. These signals compete for attention. If the five o’clock signal is stronger than the seven o’clock one, for instance, the seven o’clock one gets shut down. The cells in effect “vote” on which direction they are detecting and the winner takes all.

Many neuroscientists think that something very similar is going on in visual illusions and rivalry. Think of the duck and rabbit with two possible interpretations. Hugh R Wilson, a neuroscientist at the Centre for Vision Research at York University, Toronto, proposed the simplest model, one stack with just two cells. Rodica Curtu, a mathematician at the University of Iowa, John Rinzel, a biomathematician then at the National Institutes of Health, and several other scientists have analysed this model in more detail. The basic idea is that one cell fires if the picture looks like a duck, the other if it resembles a rabbit. Because of the inhibitory connections, the winner should take all. Except that, in this illusion, it doesn’t quite work, because the two choices are equally plausible. That’s what makes it an illusion. So both cells want to fire. But they can’t, because of those inhibitory connections. Yet neither can they both remain quiescent, because the incoming signals encourage them to fire.

One possibility is that random signals coming from elsewhere in the brain might introduce a bias of perception, so that one cell still wins. However, the mathematical model predicts that, even without such bias, the signals in both cells should oscillate from active to inactive and back again, each becoming active when the other is not. It’s as if the network is dithering: the two cells take turns to fire and the network perceives the image as a duck, then as a rabbit, and keeps switching from one to the other. Which is what happens in reality.

Generalising from this observation, Wilson proposed a similar type of network that can model decision-making in the brain – which political party to support, for instance. But now the network consists of several stacks. Maybe one stack represents immigration policy, another unemployment, a third financial regulation, and so on. Each stack consists of cells that “recognise” a distinct policy feature. So the financial regulation stack has cells that recognise state regulation by law, self-regulation by the industry, or free-market economics.

The overall political stance of any given political party is a choice of one cell from each stack – one policy decision on each issue. Each prospective voter has his or her preferences, and these might not match those of any particular party. If these choices are used as inputs to the network, it will identify the party that most closely fits what the voter prefers. That decision can then be passed to other areas of the brain. Some voters may find themselves in a state akin to a visual illusion, vacillating between Labour and Liberal Democrat, or Conservative and Ukip.

This idea is speculative and it is not intended to be a literal description of how we decide whom to vote for. It is a schematic outline of something more complex, involving many regions of the brain. However, it provides a simple and flexible model for decision-making by a neural network, and in particular it shows that simple networks can do the job quite well. Martin Golubitsky of the Mathematical Biosciences Institute at Ohio State University and Casey O Diekman of the University of Michigan wondered whether Wilson’s networks could be used to model more complex examples of rivalry and illusions. Crucially, the resulting models allow specific predictions about experiments that have not yet been performed, making the whole idea scientifically testable.

The first success of this approach helped to explain an experiment that had already been carried out, with puzzling results. When the brain reassembles the separate bits of an image, it is said to “bind” these pieces. Rivalry provides evidence that binding occurs, by making it go wrong. In a rivalry experiment carried out in 2006 by S W Hong and S K Shevell, the subject’s left eye is shown a horizontal grid of grey and pink lines while the right eye sees a vertical grid of grey and green lines. Many subjects perceive an alternation between the images, just as della Porta did with his books. But some see two different images alternating: pink and green vertical lines, and pink and green horizontal lines – images shown to neither eye. This effect is called colour misbinding; it tells us that the reassembly process has matched colour to grid direction incorrectly. It is as if della Porta had ended up seeing another book altogether.

Golubitsky and Diekman studied the simplest Wilson network corresponding to this experiment. It has two stacks: one for colour, one for grid direction. Each stack has two cells. In the “colour” stack one cell detects pink and the other green; in the “orientation” stack one cell detects vertical and the other horizontal. As usual, there are inhibitory connections within each stack to ensure a winner-takes-all decision.

Following Wilson’s general scheme, they also added excitatory connections between cells in distinct stacks, representing the combinations of colour and direction that occur in the two “learned” images – those actually presented to the two eyes. Then they used recent mathematical techniques to list the patterns that arise in such a network. They found two types of oscillatory pattern. One corresponds to alternation between the two learned images. The other corresponds precisely to alternation between the two images seen in colour misbinding.

Colour misbinding is therefore a natural feature of the dynamics of Wilson networks. Although the network is “set up” to detect the two learned images, its structure produces an unexpected side effect: two images that were not learned. The rivalry experiment reveals hints of the brain’s hidden wiring. The same techniques apply to many other experiments, including some that have not yet been performed. They lead to very specific predictions, including more circumstances in which subjects will observe patterns that were not presented to either eye.

Similar models also apply to illusions. However, the excitatory connections cannot be determined by the images shown to the two eyes, because both eyes see the same image. One suggestion is that the connections may be determined by what your visual system already “knows” about real objects.

Take the celebrated moving illusion called “the spinning dancer”. Some observers see the solid silhouette of a dancer spinning anticlockwise, others clockwise. Sometimes, the direction of spin seems to switch suddenly.

We know that the top half of a spinning dancer can spin either clockwise or anticlockwise. Ditto for the bottom half. In principle, if the top half spins one way but the bottom half spins the other way, you would see the same silhouette, as if both were moving together. When people are shown “the spinning dancer”, no one sees the halves moving independently. If the top half spins clockwise, so does the bottom half.

Why do our brains do this? We can model that information using a series of stacks that correspond to different parts of the dancer’s body. The brain’s prior knowledge sets up a set of excitatory connections between all cells that sense clockwise motion, and another set of excitatory connections between all “anticlockwise” cells. We can also add inhibitory connections between the “clockwise” and the “anticlockwise” cells. These connections collectively tell the network that all parts of the object being perceived must spin in the same direction at any instant. Our brains don’t allow for a “half and half” interpretation.

When we analyse this network mathematically, it turns out that the cells switch repeatedly between a state in which all clockwise cells are firing but the anticlockwise ones are quiescent, and a state in which all anticlockwise cells are firing but the clockwise ones are quiescent. The upshot is that we perceive the whole figure of the dancer switching directions. Similar networks provide sensible models for many other illusions, including some in which there are three different inputs.

These models provide a common framework for both rivalry and illusion, and they unify many experiments, explain otherwise puzzling results and make new predictions that can be tested. They also tell us that in principle the brain can carry out some apparently complex tasks using simple networks. (What it does in practice is probably different in detail, but could well follow the same general lines.)

This could help make sense of a real brain, as new experiments improve our ability to observe its “wiring diagram”. It might not be as ambitious as trying to model the whole thing on a computer, but modesty can be a virtue. Since simple networks behave in strange and unexpected ways, what incomprehensible quirks might a complicated network have?

Perhaps Dalí, and Escher, and the spinning dancer can help us find out. 

Ian Stewart is Emeritus Professor of Mathematics and Digital Media Fellow at the University of Warwick

Chris Ball/UNP
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The fish-eaters and the fasters

With a population split between whites and Asian Muslims, in some ways Nelson in Lancashire feels like similar-sized towns in Ulster: two communities separated by a gulf of non-communication.

In the late afternoon of local election day this month, the chairman of Nelson Town Council was working the terraces of old cotton weavers’ houses on his patch. Sajid Ali was wearing a red rosette and a navy blue cardigan over his capacious white shalwar kameez, and what looked like his dancing shoes.

This was not the forlorn ritual of unanswered doors, blank looks and curt responses habitually experienced by Labour canvassers even in more promising political times. Along these streets Sajid is a figure of some consequence: a jolly fellow and, as one opponent put it, an “interesting character”.

Almost everyone was in; Sajid knew almost all of them; and they in turn understood what was required. Sometimes a quick burst of Lancy Punjabi did the job: “Salaam alaykum, yoong maan, how yer doing? What time yer coomin’ to vote?” To older voters his spiel would be entirely in Punjabi and the response would often be a head-wobble, that characteristic south Asian gesture, which, when given to Westerners, can be baffling, but in these cases clearly signified solid intention.

The Labour candidate in the Brierfield and Nelson West division of Lancashire County Council, Mohammed Iqbal, held his seat comfortably on the day his party lost control of the county. And he did so on a poll of 58 per cent: a far higher turnout than in any of the other, whiter areas of Pendle; the highest in Lancashire; and higher than wards with these demographics would usually expect even at a general election. The average across Lancashire on 4 May was 37 per cent. It seems reasonable to conclude that the votes from those of ­Pakistani heritage, marshalled by Sajid, were wholly responsible.

Nelson is a strange, sad, divided, forgotten old cotton town, not without beauty. The weavers’ houses are stone not brick, which, elsewhere, might make them rather chic. A few minutes from town is wonderful Pennine countryside, and to the north the view is dominated by Pendle Hill itself, brooding like some sleeping sea monster.

Pendle is both the borough council and the constituency, where the mix of urban and rural has delivered it to the winning side in seven of the eight general elections since its creation 34 years ago. (Labour took it, five years prematurely, in 1992.) No one seriously believes the 5,400 Tory majority is in play. Nonetheless, Nelson can explain a lot about British politics in 2017.

“This was a cracking town,” said John Bramwell (“John the Fish”), who has been purveying cod, haddock and non-stop banter to Nelson for 41 years, first on the market, now from one of the last white-run, independent shops in the town centre. Nelson had a football team that played fleetingly (1923-24) in the old Second Division, what is now called the Championship. And in 1929 the Lancashire League cricket team, flashing cash in a manner that baffled the national press, signed Learie Constantine, the most gifted and thrilling West Indian all-rounder of his generation.

“When he arrived, no one in Nelson had ever seen a black man close-to,” said Derek Metcalfe, the club’s historian. “People would cross the road when he passed by. But he grew into their affections. He was a highly intelligent man as well as a great player.” Constantine, after a post-cricket career in the law, Trinidadian politics and diplomacy, finished life in the House of Lords as Baron Constantine of Maraval and Nelson, Britain’s first black peer. In July 1943 the Imperial Hotel in Bloomsbury accepted his booking but not his presence, and he promptly sued. His victory at the high court the following year was an early landmark in the fight against racial discrimination.

It was the 1950s before Nelson would get used to seeing non-white faces again, when the mill owners, battling labour shortages and overseas competition, turned to Pakistan to find biddable and affordable workers. They found them in Gujrat District, which is not one of the more worldly places, even in the rural Punjab.

“The first group were young men who in many ways integrated better than they do now. There were no mosques. They went to the pubs with their workmates and knocked around with local women. Then they had to go to the airport to collect the intended wives they hadn’t met yet,” recalled Tony Greaves, the Liberal Democrat peer who is deputy leader of Pendle Borough Council.

The mills disappeared, gradually but inexorably, but the Pakistani community kept growing and has now reached its fourth generation. The young men do not normally spend time in pubs; indeed, in a town of 30,000 people, there are only two left, plus a couple on the outskirts. It is hard to imagine anywhere that size in Britain with fewer. There are, however, at least a dozen mosques. The 2011 census recorded 40 per cent of the population as Asian, but on market day in the town centre the proportion seems much higher. The most prominent retail outlets are two bazaars: the Nelson (the
old Poundstretcher) and the Suraj opposite (the old Woolworths). Few white faces are seen in either: the saris and hijabs are beautiful but of little interest. They are all imported to this textile town from south Asia.

The white people have retreated, either out of the town altogether or to the semis of Marsden, on the hill. In the visible life of Nelson, they are clearly a minority. Population change on this scale can be accommodated, if not always easily, in large cities. It is a different proposition in a small town that was once tight-knit and, despite its closeness to larger places such as Blackburn, Accrington and Burnley, largely self-contained.

Even after 60 years, hardly anything has melted in the pot. The early migrants were villagers who placed little value on education. Recent history has led Muslims all over the world to turn inwards, to their own religion and culture. This is being exacerbated by white flight and by the advent of religious free schools, a disaster for anywhere in search of cohesion. The old Nelsonians have turned away. “Nelson is not multiracial or multicultural. It is biracial and bicultural,” says Greaves. “I would love to tell you that I go round to Abbas’s house to have chicken jalfrezi and he comes to mine for steak pudding and chips,” says John the Fish. “It’s just not like that.”

Unemployment is high at 18 per cent; there is no shortage of taxis. Educational attainment is patchy. Teachers at the two high schools fear their best pupils will be creamed off further by the promised grammar-school boom.

The vicar of Nelson, Guy Jamieson, and at least some of the local imams do their utmost to make connections between the communities. In certain respects Nelson feels like similar-sized towns in Ulster: two communities separated by a gulf of non-communication. In other ways, this description is unfair. When Burnley, just four miles away, suffered riots in 2001, Nelson stayed quiet. I could sense no threat, no active tension, merely resigned indifference on both sides. “There’s a poverty of confidence,” Jamieson said. “They don’t know how to sit down and engage.”

***

A modern English town council, subordinate to Brussels, Westminster, county and district, is an improbable power base, but Sajid Ali seems to be making Nelson’s work. Its precept is only £330,000 a year but this is not capped, so it suits both district and town if Pendle offloads smaller assets: parks, play areas, community centres. It is a minimalist form of devolution, but harks back to the days when Nelson was a borough in its own right, and looks forward to an improbable future when our towns might again be allowed to take their own decisions as they do in more grown-up countries.

But the council votes on party lines, Labour’s 16 councillors trumping the Tories’ eight. “They won’t work with us,” Sajid says flatly. “They don’t run it fairly for the town itself,” says the Conservative Neil McGowan. “If we put something forward for Marsden, we are always outvoted. One council official told me they’d never come across a town like it.” In Tony Greaves’s words, “The
politics in Nelson were always sour.” In the 1930s it was known as Little Moscow.

When I first met Sajid, however, he was outside a polling station doing a stint as a teller and laughing merrily along with his blue-rosetted counterpart, Arshad Mahmood. Yet things were not quite as they seemed. Mahmood was part of a mass defection of Pakistani Lib Dems to the Conservatives which appears to have nothing to do with Brexit, extra taxes for the NHS or Maymania. What it does have to do with remains elusive even to local politicians: “clan politics” and “personal ambition” were mentioned. It may be even more complicated than that. “So you’ll be voting for Theresa May next month?” I asked Mahmood. “Oh, no, I like Jeremy Corbyn. Very good policies.”

Perhaps this helped Sajid maintain some enthusiasm for the bigger campaign ahead, though he was daunted by one fact: the general election coincides with Ramadan, and dawn-to-dusk fasting comes hard in these latitudes when it falls in summertime. Still, he was impressed by all the new members Corbyn had brought to Labour: “The way I see it is that each new member has five, ten, 15, 20 people they can sell the message to.”

This seemed a bit strange: it implied he thought politics in the rest of Britain worked as it did in these streets. He had boasted earlier that he knew everyone. “All over Nelson?” “Oh, no,” he had backtracked. “In the English community nobody knows their next-door neighbour.” Which was an exaggeration, but perhaps not much of one.

There were no posters along Sajid Ali’s streets – not one. The information about which house to choose was on the canvass return and, more significantly, in his head. Just once he got it wrong. A little white girl opened the door and then a tattooed, muscular figure in a singlet barrelled towards the door. He wasn’t aggressive, just brisk. “Naaw. I doan’t vote.” End of. It was a sudden reminder of the norms of modern British politics.

***

Another norm is that, at any local count, no one ever thinks much of the big picture. The rise and fall of prime ministers, earthquakes and landslides are no more than distant rumours, of surprisingly little interest to the principals; what matters is the here and now. Where did that ballot box come from? How big is the postal vote? Any chance of a recount? When the five seats for Pendle were counted the next day at the leisure centre in Colne, one stop further up the clanking branch line from Nelson, no one was talking about the Tory takeover at County Hall.

Here there was something for everyone: Mohammed Iqbal won, just as Sajid predicted. Azhar Ali took the other Nelson seat even more easily for Labour. Both results were greeted with more effusive male hugs than would be considered seemly in Berkshire. In Pendle Central the Tories knocked out the sitting Lib Dem, but – heroically, in their eyes – one of the Lib Dem candidates grabbed a seat in the rural division.

But the most interesting result came in the most trifling contest: a twinned by-election for two vacancies in Nelson Town Council’s lily-white ward of Marsden, so electors had two votes each. The seats were won by a Conservative married couple, the Pearson-Ashers, who got 426 and 401; the single BNP candidate had 359 votes, with one Labour candidate on 333 and the other on 190. The first of these was called Laura Blackburn; the second Ghulam Ullah. This suggests a good deal of vote-splitting that Labour might find rather unpalatable.

In fact, Marsden already has one far-right relic: Brian Parker, who sits on Pendle Borough Council, is the last survivor in the top two tiers of local government of the BNP mini-surge that took them to 55 council seats across the country by 2009. Of Parker, two opposing councillors told me: “He’s actually a very good ward councillor.”

Curiously, Ukip has made little impact in Nelson or in Pendle as a whole. So there is not much scope for the party to fulfil what appears to be its immediate destiny: as a way station for Labour’s historic core voters to catch their breath on the arduous journey into Theresa May’s arms. According to John the Fish, whose shop functions as a kind of confessional for white opinion, they may no longer need a stopover: “I’m getting plenty of people, staunch Labourites, telling me they can’t stand Corbyn.”

I asked him how many Pakistani regulars he had. He broke off from chopping hake and held up five fingers. On 8 June the fish-eaters of Marsden can be expected to rouse themselves more energetically than the Ramadan fasters across town.

***

Seedhill, the cricket ground graced by Constantine, is pretty Nelson rather than gritty Nelson, even though a chunk of it, including the old pavilion, was lopped off years ago to form an embankment carrying the M65. Upstairs in the pavilion is a wonderful picture of the great man, eyes ablaze, down on one knee for a full-blooded cover-drive. It would have made a better monument in the town centre than the 40-foot weaving shuttle that has dominated Market Street since 2011. I thought it was a torpedo; children think it’s a giant pencil.

The packed houses that watched Constantine lead Nelson to seven league titles in nine years have dwindled now: there were only a couple of dozen to watch his successors play Accrington recently. But it was a drab day with a chilly breeze and Burnley were at home to West Brom in the winter game down the road.

And generally the club thrives better than the town. Given the lack of hotels and pubs, the pavilion is much in demand for functions, and the team remains competitive. Nelson fielded four local Asians for the Accrington match, which suggests that, in one activity at least, integration is just about where it should be.

It seems unlikely that a similar situation would apply at the crown green bowls or the brass band, or any other of the long-standing recreations in Nelson (though small but growing numbers of Pakistanis are now taking allotments). The knee-jerk liberal reaction might be that this is somehow the fault of the white Nelsonians. I think this attitude is a grave oversimplification that has done much damage.

In one respect the incomers have re-created the old life of Nelson. In the hugger-mugger stone-built terraces, the neighbourliness, the power of extended families, the external patriarchy and the internal matriarchy, the vibrancy, the sense of communal struggle . . . that is exactly what this cotton town must have been like a century ago. 

This article first appeared in the 18 May 2017 issue of the New Statesman, Age of Lies

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