I ask Charles about synaesthesia, an effect that has always intrigued me in which a signal in one sense also stimulates a brain response in another. A synaesthete might find that musical tones correspond to certain colours and textures, or that shapes conjure up tastes, for example. Some of my favourite composers and artists have claimed synaesthetic experience: Kandinsky, Hockney, Messaien, Sibelius and F. T. Marinetti, whose Futurist Cookbook includes recipes that require the diner to eat with one hand while stroking silk or sandpaper with the other, or to eat in a flight simulator so that the vibrations stimulate the taste-buds. One of the more persuasive claimants is the author Vladimir Nabokov, who lists the colours he associates with the letters of the alphabet in his autobiography, Speak, Memory. For him, each letter retains its distinct colour when placed next to others in a word, unless it produces a diphthong which happens to exist as a single letter in another language (such as happens with sh and ch and other combinations in the Russian alphabet of Nabokov’s early years); in this case, the single colour associated with the letter in the other language bizarrely stains the English letters that make up the equivalent phoneme.
Synaesthesia first attracted the attention of scientists in the late nineteenth century, when the multisensory experiences offered by the ‘total artworks’ of Wagner, Post-Impressionism, absinthe and opium doubtless encouraged them on their way. Little progress was made in understanding it, however, owing to the highly subjective nature of the phenomenon. It is only now being dusted off by neuroscientists, who are interested in what it might tell us about the brain’s ability to cross-wire the senses.
What is synaesthesia? Is it a condition, a delusion, an advantage or a curse? It is not listed in the most widely used psychiatric manual. It seems it is a neurological state of being, but not a neurological disorder, less like a condition and more like a cartoon hero’s ‘super power’. It’s not quite all wine and roses: ‘Synaesthetes may not be able to read a book because of the rush of extra information,’ Charles tells me. But they do enjoy the extra sensations and are better able to remember things as a result. ‘Synaesthetes wouldn’t take a pill to get rid of it.’ Synaesthetes come across rather like the members of an exclusive arty club. Certainly, there are many who clamour for admission. Conspicuous aesthetes such as Rimbaud and Baudelaire wrote works implying they had synaesthesia, for example, but scholars now believe that their experience of it was entirely vicarious, and they probably only picked up on the concept from medical reports. In modern tests, it is found in fact that women are more likely to experience synaesthesia than these male pseuds. Yet any of us might refer without affectation to a flower bed being a symphony of colour. We know there is music called the blues. Perhaps we are all latent synaesthetes.
Even blind people can have synaesthetic visual experiences, for example ‘seeing’ flashes of colour in response to aural signals such as numbers or letters being read out. It is thought that infants may possess neural pathways crossing over between the aural and the visual that are cut off in later life. One neuroscientist, Vilayanur Ramachandran, who has also worked on phantom limbs, describes the extraordinary case of one blind patient who began to notice that whenever he touched objects or read Braille his mind would conjure up flashes of light or vivid images (although not pictures of the item being touched). Such experiences suggest that neural pathways to the brain behind the damaged eye are somehow commandeered by these aural and tactile signals. Other blind people find that their hearing improves. It may not be their acuity to any sound that increases, but the ability specifically to process sounds that assist with spatial perception, which becomes such a challenge with the loss of sight. Individual cases such as these provide growing evidence that what scientists term the ‘neuroplasticity’ of the brain is directed towards restoring or enhancing its useful function when needed rather than merely shuffling the senses around at random.
The Stomach
It is not clear at what point the Very Reverend Doctor William Buckland’s project to eat everything tipped from earnest scientific enquiry to sheer silliness.
Buckland was a noted geologist, and the first professor in the subject at the University of Oxford. His masterpiece was Vindiciae Geologiae, a work which set out a new theory for the subject in which fossils predated Noah’s flood, but the Bible nonetheless remained literally true – a cunning piece of interpretation that relied on defining the ‘beginning’ in Genesis as some vague time after the formation of the earth but before the advent of man and other present-day species. He was the first to identify coprolites – fossilized dung – which provide our only direct evidence of what the dinosaurs ate. Against a background of suddenly rising grain prices, he wrote in favour of scientific agriculture, proper land drainage and irrigation, and allotments for the ‘labouring poor’. All this work secured Buckland’s reputation, and he rose in academia and the church to become the canon of Christ Church, Oxford, and later the dean of Westminster.
Buckland was not a man to be confined by establishment conventions, however. At the same time as pleasing everybody with his efforts to square the story of the Bible with the evidence of geology, he pursued a plan to taste the flesh of every animal. Though a notable scientist, he seems to have left no systematic record of his extended gustatory experiment; what information we have comes from anecdotes that continue to be passed down by Buckland’s descendants. It might be supposed that the project was an extension of his wish to identify new sources of food for the growing population, but in reality it seems to have been simply his own eccentric whim. He tried hedgehog, crocodile, panther, puppy and garden snail. The naturalist Richard Owen was entertained to roast ostrich, which he found tasted like ‘coarse turkey’. The critic John Ruskin much regretted missing another dinner at which was served ‘a delicate toast of mice’.
Certainly, Buckland was not afraid to shock his contemporaries. Visiting a cathedral overseas, his attention was drawn to ‘a martyr’s blood – dark spots on the pavement ever fresh and ineradicable’. His scepticism aroused, Buckland knelt and put his tongue to the spots, and was immediately able to report otherwise: ‘I can tell you what it is; it is bat’s urine.’ The account of one exceptional meal only emerged nearly fifty years after his death, when the writer Augustus Hare recollected being at a dinner with Lady Lyndhurst at her house in Nuneham near Oxford, where the heart of a French king (perhaps that of Louis XIV or Louis XVI; accounts differ) was said to lie preserved in a silver casket. As Hare tells it:
Dr. Buckland, whilst looking at it, exclaimed, ‘I have eaten many strange things, but have never eaten the heart of a king before,’ and, before anyone could hinder him, he had gobbled it up, and the precious relic was lost for ever. Dr. Buckland used to say that he had eaten his way through the whole animal creation, and that the worst thing was a mole – that was utterly horrible.
In a footnote, Hare adds: ‘Dr. Buckland afterwards told Lady Lyndhurst that there was one thing even worse than a mole, and that was a blue-bottle fly.’
Buckland’s unusual hobby did nothing to hinder his advance. Perhaps it even helped: as dean of Westminster in 1845, he used his position to improve the meals for boys at Westminster School – who knows what treats they were served. He died in 1856 aged seventy-three from an infection of the spine which spread to the brain, so we can presume at least that nothing he had eaten did him any lasting harm.
Of course, items such as ostrich and crocodile are now available in our fancier food emporia. My well-thumbed copy of The Joy of Cooking, the American classic, includes instructions for cooking porcupine, raccoon, bear (‘Bear cub will need about 2½ hours’ cooking; for an older animal, allow 3½ to 4 hours.’) and other road-kill recipes.
What does this unlucky bestiary say about the human stomach? Buckland seems mainly to have eaten whatever came his way partly out of a desire to amuse or shock. The reverend doctor certainly had no scriptural qualms concerning the prohibitions of Leviticus, since he doubtless ate numerous ‘abominable things
’, including the bluebottle, which falls into the prohibited category of winged insects. If he did not try other unclean species such as hoopoe and hyrax, it is probably only because the opportunity never presented itself. Looking at his project more broadly, it seems reasonable to suppose that if he had put a fraction of the effort he put in to eating animals towards the evaluation of new vegetable sources of nutrition, he might have made a more practical contribution to the problems of feeding the world’s population.
The catalogue of animals that Buckland consumed is perhaps chiefly remarkable for reminding the rest of us how very few species generally make up our diet. The stomach is one of the simplest parts of the body to have earned the name of organ. As I am forced to acknowledge on seeing one for the first time in the dissection room, it is really just a bag, and as with any bag, you can put anything into it as long as it fits. Chevalier Jackson, a Philadelphia laryngologist, made a collection of the objects he retrieved from patients’ throats and stomachs 100 years ago. He amassed thousands of items, including keys, a padlock, nails and unclosed safety pins. The Gordon Museum, which houses the pathological anatomy collections of a number of the London teaching hospitals, exhibits a similarly extreme miscellany of objects swallowed down the years on purpose or by accident, including the bedsprings found in the stomach of a Brixton prison inmate who had been that desperate ‘to get out for a while’.
Humans are natural omnivores. Although we are not equipped with sharp teeth and claws and the speed to catch prey, we do have the big brains conferred on us by evolution which have enabled us to use tools and cunning to diversify our diet. Our baglike stomach can hold anything, and the five metres of intestines that lie downstream of it can make a good job of digesting most things. We can digest raw meat, but the discovery of fire gave us the ability to process meat far more effectively, and so to eat far more of it (more than is good for us). On the other hand, we can digest surprisingly little of what the vegetable kingdom has to offer, preferring as we do ripe fruit to grass and bark, since our stomachs lack the compartments that act like fermentation vats in true herbivores, breaking down the more fibrous organic matter. The disgust that we feel, therefore, when we are forced to consider a meal of bluebottle, or for that matter the human consumption of a human heart, is based entirely on culture rather than nature.
In perhaps the most famous of his essays, ‘On the Cannibals’, Michel de Montaigne wrote: ‘I think there is more barbarity . . . in lacerating by rack and torture a body still fully able to feel things . . . than in roasting him and eating him after his death.’ And indeed, human flesh, like most flesh, is nourishing to the omnivorous human body. What does it taste like? ‘Human flesh tastes like pork,’ according to Helen Tiffin, the author of an essay exploring humanity’s debt to the pigs that feed us and that now grow our replacement organs, too; ‘hence’, she continues, ‘the term “long pig” for human meat cuts, the “long” denoting the difference between the limb lengths of pig and human. Although there are few “first hand” accounts of the flavor of human flesh, its similarity in texture and taste to that of pork seems generally agreed upon.’ If the use of cadavers in medicine is acceptable utilitarian practice, Montaigne reasoned, then why isn’t their use for nourishment? In an age when physicians would taste a patient’s blood as an aid to diagnosis, and ground human skull (with or without ginger) was prescribed as a remedy for fits, cannibalistic practices might even be regarded as a legitimate medicinal use for the body.
Although tales of cannibalism continue to excite us as they once did Montaigne and Defoe and Melville, anthropologists had more or less set it aside as a topic for serious study. Alleged instances were historical or otherwise hard to confirm, and the sensationalism aroused was giving anthropology as a whole a bad name. However, interest was revived by an outbreak of the prion disease kuru in the mid twentieth century among the Fore people of the Papua New Guinea highlands. Prions are infectious agents based on proteins rather than on nucleic acids, as viruses and bacteria are. Prion diseases cause progressive loss of muscular coordination which is typically characterized by trembling, dementia and paralysis. The Papua New Guinea epidemic ultimately killed more than 2,500 people. The peculiar pattern of incidence of kuru was supposedly explained by a residual custom of cannibalism as the mode of transmission. Women would eat the brain and spinal cord of deceased relatives and become infected, as would children through contact with their mothers during ritual feasts. Men, who ate primarily the less infective muscle tissue, showed a lower infection rate.
But the American anthropologist William Arens is sceptical in regard to all claimed instances of ritual cannibalism, including even these ones where anthropological study is supplemented by medical scientific investigation. Arens notes that both medical and social scientists have tended to take unconfirmed stories of cannibalism as read, and that even professional anthropologist ‘witnesses’ may have been duped by seeing natives consuming what is in fact pig meat. (Melville teases the reader with just such a confusion in his South Seas novel Typee, where the mere lighting of a fire is enough to excite the fears of the two castaways at the centre of the story that they are for the pot. Then ‘some kind of steaming meat’ is brought out: ‘A baked baby, I dare say!’ They find it tastes ‘excellently good . . . very much like veal’. But their terror is revived when they recall that there are no cows on the island. ‘What a sensation in the abdominal region! Sure enough, where could the fiends incarnate have obtained meat?’ Finally, one of the men holds a lighted taper over the pot and to his great relief identifies ‘the mutilated remains of a juvenile porker’.) When the infectious protein or prion responsible for kuru was duly traced, the cannibalism route for transmission remained largely accepted, although in Arens’s view the evidence was still only ‘circumstantial’. How is it, he wonders, that cannibalism explains kuru seen among a remote New Guinean tribe, but is not suggested as a route for the transmission of the related Creutzfeldt-Jakob disease when it is found among developed societies? In general, controversy persists about the very existence of ritual cannibalism, with no solid evidence of contemporary practice and only unsubstantiated evidence of past practice. But if the practice is absent, the fear of it is apparently universal. More detached anthropologists have observed that very often the ‘primitive’ groups under investigation for supposed cannibalistic behaviour turn out to have their very own cannibalism myths about those who have come to study them!
From variety to quality – and quantity.
The potential for the human stomach to accommodate, if not everything, then at least an exciting variety of what nature has to offer leads us to the idea of the delicious. Why, when so much can be called food, are we so picky about what we eat? It is usually wise to turn to the French for advice in these matters, and none stands higher in this field than the author of the quasi-scientific masterpiece The Physiology of Taste, Jean Anthelme Brillat-Savarin, the only man, so far as I can discover, to enjoy the uniquely Gallic honour of having a cheese named after him. ‘To eat is a necessity,’ he observed. ‘To eat well is an art.’
Published in 1825, when Buckland was only on the hors d’œuvres of his grotesque eating experiment, The Physiology of Taste set the parameters for an emerging national cuisine in post-revolutionary France. It is a glorious mélange of recipes, history, humorous anecdotes, invented words, autobiography and food science, all prefaced by a number of ‘aphorisms of the professor’, which include the still-famous comments ‘Tell me what you eat, and I shall tell you what you are,’ and ‘The discovery of a new dish does more for human happiness than the discovery of a star.’ Brillat-Savarin, who was a lawyer and wrote large portions of the book in dull interludes while sitting in court as a judge, is accurate enough for his time on the workings of the human sense of taste, and why some of us are non-tasters while others are super-tasters, able perhaps to discern ‘the latitude under which a wine has ripened’ or ‘the special flavor of the leg upon which a sleeping pheasant rests his
weight’. He explores the close relation of taste and smell, drawing much from an interview with a man whose tongue has been cut out as a punishment. He’s good, too, on the patent inadequacy of our convention of breaking down flavours into sweet, sour, bitter and salt. Modern classifications also admit the sensation of hotness imparted by chillies and an aromatic savoury sense, umami, from the Japanese, which Brillat seems to anticipate with his coinage of the term ‘osmazome’ to describe the depth of a good stock. But these few terms do not begin to compass the infinity of tastes, which would need ‘mountains of folio foolscap to define them, and unknown numerical characters for their classification’.
He has less to say, however, on how the gut digests food and the ways in which we extract from it energy, proteins, vitamins and minerals. For Brillat’s chief concern is our pleasure in food, as his book’s subtitle reveals: Meditations on Transcendental Gastronomy. In short, he wants us all to be gourmands. ‘Gourmandism is an impassioned, considered, and habitual preference for whatever pleases the taste,’ he writes – and not to be confused with gluttony, he adds hastily, for gourmandism ‘is the enemy of overindulgence’. He identifies some natural classes of gourmand: the clergy, writers, bankers, and also doctors, whom he nevertheless chides for their unpleasant-tasting medicines and austere dietary regimens. Gourmandism is for girls, too: ‘it is basically favorable to their beauty’. Gourmands make better marriages and live longer.
Anatomies: A Cultural History of the Human Body Page 21