Humans have a unique ability to imagine a world beyond their immediate surroundings. Image: Getty
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Gods and monsters

The ability to ask the question "What makes us human?" is what makes us human, argues P D James.

Editor's Note, 27 November 2014: PD James has died aged 94. This article first appeared in the New Statesman in July 2013.

What makes us human is the brain which enables us to ask just this question. We are aware how much we share with the animal kingdom and how close our DNA is to that of the higher mammals. We increasingly hear how much we all have in common with animals. Animals often show at least an equal concern with looking after their young. We know that elephants can grieve, that chimpanzees and other apes learn to use tools and even to share them, so there is the beginning of what we think of as unselfish sharing for mutual benefit. But animals, even those whose DNA is closest to ours, cannot make or control fire.

One wonders how this powerful tool was first discovered, perhaps by primitive man constantly rubbing two dry sticks together in a moment of boredom and producing a spark that lighted a pile of dry leaves. With this apparent miracle a significant step in the long rise to humanity was taken. Fire could be used to frighten away predators, provided the warmth which enabled early man to survive extreme cold and gave him the ability to cook meat and render it more digestible and life-sustaining. The making of fire was one of the most important discoveries which set human beings on the path to domination.

But most people, when faced with the question of what makes us human, give thought to a wider dimension than the difference between Homo sapiens and the animal kingdom, a dimension which includes ethics and morality and the recognition of responsibility for other than the immediate family or species. An animal has no concept of reality outside its own life and that of its young, and its place in the herd. Because we have the capacity to imagine and sympathise with the emotions including the pain of others, surely that implies a responsibility to alleviate suffering and promote well-being among all sentient creatures, including the animals of which we make use for our sustenance, convenience and pleasure.

To describe a person as acting like an animal is an insult, while the expression, “crime against humanity”, implies that there is some behaviour regarded as so appalling that the perpetrator is offending against a recognised code of what is acceptable from human beings. If the offence is committed by a single individual he is commonly labelled a psychopath, a diagnosis which it is seldom possible to follow with effective treatment. If the outrage is committed by a country, as with genocide, international opprobrium and a system of reparation, where this is possible, usually follow. We have the ability, both internationally and at home, to militate against behaviour we view as unacceptable and to make it illegal and punishable by law. We set up complicated legal and social contrivances designed to enable us to live together in peace and safety and which, in all civilised societies, are accepted and incorporated in words. The extent and richness of a country’s language is among the most important measures of its civilisation, and it is primarily language which makes us human.

When we think about what it means to be human, often we are considering what personal preoccupations, ambitions and conduct to others make us unique creatures on the planet. Unlike animals, human beings occupy their minds with concerns outside the compulsions of sex, food, shelter and the herd: the creation of our universe, the possibilities that other planets might sustain life and that eventually we shall make contact with other intelligent beings and communicate with them. We create gods ranging from tribal images in wood and stone to complicated theological arguments, and set up organisations to accommodate these deities and define the obligations of belief and worship.

But in the end the simple difference remains. Over millions of years the Darwinian process of evolution which has given us a Newton, a Shakespeare and a Mozart, has resulted in the human capacity to think, to wonder, to create and to invent. The capacity which enables us to use science to destroy each other in wars is also used to conquer disease, with the risk that we reproduce in numbers which inevitably outstrip the natural resources on which we depend. Unlike animals, we have the means to destroy Planet Earth by our greed, or to make it a safer place in which all living creatures can live.

How should we relate to each other? How do we deal with those aggressive impulses which seem to be in our nature? How do we tolerate people who are different, especially when they come to live among us? How should we educate our young? Is the nuclear family the only right pattern for marriage and parenthood? How can we save the planet which we alone among living creatures have the power to destroy? This is the ultimate question which faces us as humans and it is one of which the animal kingdom is oblivious. It is our responsibility, and it is this responsibility that makes us human.

P D James’s most recent book is “Death Comes to Pemberley” (Faber & Faber, £7.99) This article is the twelfth in our “What Makes Us Human?” series, published in association with BBC Radio 2 and the Jeremy Vine show

This article first appeared in the 22 July 2013 issue of the New Statesman, How to make a saint

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How nature created consciousness – and our brains became minds

In From Bacteria to Bach and Back, Daniel C Dennett investigates the evolution of consciousness.

In the preface to his new book, the ­philosopher Daniel Dennett announces proudly that what we are about to read is “the sketch, the backbone, of the best scientific theory to date of how our minds came into existence”. By the end, the reader may consider it more scribble than spine – at least as far as an account of the origins of human consciousness goes. But this is still a superb book about evolution, engineering, information and design. It ranges from neuroscience to nesting birds, from computing theory to jazz, and there is something fascinating on every page.

The term “design” has a bad reputation in biology because it has been co-opted by creationists disguised as theorists of “intelligent design”. Nature is the blind watchmaker (in Richard Dawkins’s phrase), dumbly building remarkable structures through a process of random accretion and winnowing over vast spans of time. Nonetheless, Dennett argues stylishly, asking “design” questions about evolution shouldn’t be ­taboo, because “biology is reverse engin­eering”: asking what some phenomenon or structure is for is an excellent way to understand how it might have arisen.

Just as in nature there is design without a designer, so in many natural phenomena we can observe what Dennett calls “competence without comprehension”. Evolution does not understand nightingales, but it builds them; your immune system does not understand disease. Termites do not build their mounds according to blueprints, and yet the results are remarkably complex: reminiscent in one case, as Dennett notes, of Gaudí’s church the Sagrada Família. In general, evolution and its living products are saturated with competence without comprehension, with “unintelligent design”.

The question, therefore, is twofold. Why did “intelligent design” of the kind human beings exhibit – by building robotic cars or writing books – come about at all, if unintelligent design yields such impressive results? And how did the unintelligent-design process of evolution ever build intelligent designers like us in the first place? In sum, how did nature get from bacteria to Bach?

Dennett’s answer depends on memes – self-replicating units of cultural evolution, metaphorical viruses of the mind. Today we mostly use “meme” to mean something that is shared on social media, but in Richard Dawkins’s original formulation of the idea, a meme can be anything that is culturally transmitted and undergoes change: melodies, ideas, clothing fashions, ways of building pots, and so forth. Some might say that the only good example of a meme is the very idea of a meme, given that it has replicated efficiently over the years despite being of no use whatsoever to its hosts. (The biologist Stephen Jay Gould, for one, didn’t believe in memes.) But Dennett thinks that memes add something important to discussions of “cultural evolution” (a contested idea in its own right) that is not captured by established disciplines such as history or sociology.

The memes Dennett has in mind here are words: after all, they reproduce, with variation, in a changing environment (the mind of a host). Somehow, early vocalisations in our species became standardised as words. They acquired usefulness and meaning, and so, gradually, their use spread. Eventually, words became the tools that enabled our brains to reflect on what they were ­doing, thus bootstrapping themselves into full consciousness. The “meme invasion”, as Dennett puts it, “turned our brains into minds”. The idea that language had a critical role to play in the development of human consciousness is very plausible and not, in broad outline, new. The question is how much Dennett’s version leaves to explain.

Before the reader arrives at that crux, there are many useful philosophical interludes: on different senses of “why” (why as in “how come?” against why as in “what for?”), or in the “strange inversions of reasoning” offered by Darwin (the notion that competence does not require comprehension), Alan Turing (that a perfect computing machine need not know what arithmetic is) and David Hume (that causation is a projection of our minds and not something we perceive directly). Dennett suggests that the era of intelligent design may be coming to an end; after all, our best AIs, such as the ­AlphaGo program (which beat the human European champion of the boardgame Go 5-0 in a 2015 match), are these days created as learning systems that will teach themselves what to do. But our sunny and convivial host is not as worried as some about an imminent takeover by intelligent machines; the more pressing problem, he argues persuasively, is that we usually trust computerised systems to an extent they don’t deserve. His final call for critical thinking tools to be made widely available is timely and admirable. What remains puzzlingly vague to the end, however, is whether Dennett actually thinks human consciousness – the entire book’s explanandum – is real; and even what exactly he means by the term.

Dennett’s 1991 book, Consciousness Explained, seemed to some people to deny the existence of consciousness at all, so waggish critics retitled it Consciousness Explained Away. Yet it was never quite clear just what Dennett was claiming didn’t exist. In this new book, confusion persists, owing to his reluctance to define his terms. When he says “consciousness” he appears to mean reflective self-consciousness (I am aware that I am aware), whereas many other philosophers use “consciousness” to mean ordinary awareness, or experience. There ensues much sparring with straw men, as when he ridicules thinkers who assume that gorillas, say, have consciousness. They almost certainly don’t in his sense, and they almost certainly do in his opponents’ sense. (A gorilla, we may be pretty confident, has experience in the way that a volcano or a cloud does not.)

More unnecessary confusion, in which one begins to suspect Dennett takes a polemical delight, arises from his continued use of the term “illusion”. Consciousness, he has long said, is an illusion: we think we have it, but we don’t. But what is it that we are fooled into believing in? It can’t be experience itself: as the philosopher Galen Strawson has pointed out, the claim that I only seem to have experience presupposes that I really am having experience – the experience of there seeming to be something. And throughout this book, Dennett’s language implies that he thinks consciousness is real: he refers to “conscious thinking in H[omo] sapiens”, to people’s “private thoughts and experiences”, to our “proper minds, enculturated minds full of thinking tools”, and to “a ‘rich mental life’ in the sense of a conscious life like ours”.

The way in which this conscious life is allegedly illusory is finally explained in terms of a “user illusion”, such as the desktop on a computer operating system. We move files around on our screen desktop, but the way the computer works under the hood bears no relation to these pictorial metaphors. Similarly, Dennett writes, we think we are consistent “selves”, able to perceive the world as it is directly, and acting for rational reasons. But by far the bulk of what is going on in the brain is unconscious, ­low-level processing by neurons, to which we have no access. Therefore we are stuck at an ­“illusory” level, incapable of experiencing how our brains work.

This picture of our conscious mind is rather like Freud’s ego, precariously balan­ced atop a seething unconscious with an entirely different agenda. Dennett explains wonderfully what we now know, or at least compellingly theorise, about how much unconscious guessing, prediction and logical inference is done by our brains to produce even a very simple experience such as seeing a table. Still, to call our normal experience of things an “illusion” is, arguably, to privilege one level of explanation arbitrarily over another. If you ask me what is happening on my computer at the moment, I shall reply that I am writing a book review on a word processor. If I embarked instead on a description of electrical impulses running through the CPU, you would think I was being sarcastically obtuse. The normal answer is perfectly true. It’s also true that I am currently seeing my laptop screen even as this experience depends on innumerable neural processes of guessing and reconstruction.

The upshot is that, by the end of this brilliant book, the one thing that hasn’t been explained is consciousness. How does first-person experience – the experience you are having now, reading these words – arise from the electrochemical interactions of neurons? No one has even the beginnings of a plausible theory, which is why the question has been called the “Hard Problem”. Dennett’s story is that human consciousness arose because our brains were colonised by word-memes; but how did that do the trick? No explanation is forthcoming. Dennett likes to say the Hard Problem just doesn’t exist, but ignoring it won’t make it go away – even if, as his own book demonstrates, you can ignore it and still do a lot of deep and fascinating thinking about human beings and our place in nature.

Steven Poole’s books include “Rethink: the Surprising History of New Ideas” (Random House Books)

This article first appeared in the 16 February 2017 issue of the New Statesman, The New Times