Near the beginning of this wonderful book there's a reference to phrenology, the novel nineteenth-century 'science' of uncovering individual propensities by measuring the bumps in the skull. It was surmised that the bits of the brain we use most grow bigger and cause corresponding bulges in the cranium, so by measuring a person's skull you could determine his or her personality.
It seems obviously daft to us now. Those crazy Victorians! Yet as far as Raymond Tallis, is concerned, there's little to distinguish that embarrassing pseudoscience from today's voguish enthusiasm for neuroscience - what he calls neuromania. Almost everything we do and think is being 'explained' in terms of what goes on in a specific region of the brain, illustrated by coloured graphics, and experts in different fields eagerly point to confirmation of their hunches in the firing of neurons and development of neural pathways.
There are repeated references to new disciplines with the prefix 'neuro-' or 'evolutionary': neuro-jurisprudence, evolutionary economics, evolutionary aesthetics, neuro-theology, neuro-architecture, neuro-archeology and so on. Even philsophers - who should know better, being trained, one hopes, in scepticism - have entered the field with the discipline of 'X-phi', or experimental philosophy. Starry-eyed sages, for example, have invented 'neuro-ethics', in which ethical principles are examined by using brain scans to determine people's intuitions when they are asked to deliberate on the classical dilemmas.
Cognitive psychologists delight in demonstrating how our decisions are often influenced by stimuli of which we are unaware: we act in response to concealed triggers, not for the reasons we believe we act. You may think you gave spare change to that beggar out of a moral sense of duty, but actually you did it because the nearby bakery was sending out a delicious smell of fresh bread, which stimulated feelings of generosity. Brain scans give powerful new authority to this line of reasoning. While the experience of having free will feels real, it's actually an illusion.
Tallis passionately believes all this is wrong. Human behaviour and decision-making can't be reduced down to what is going on in their brains, any more than it can be explained in terms of evolutionary adaptation. Far from being chained to our evolutionary past, Tallis argues that our consciousness has developed to the point that we have the ability to recognise and subvert the unconscious impulses that are supposed to drive us. He has no patience with scientism, the 'mistaken belief that the natural sciences can or will give a complete description and even explanation of everything, including human life'. And he takes aim in particular at the orthodox view of the brain, handily summarised by Daniel Dennett:
There is only one sort of stuff, namely matter - the physical stuff of physics, chemistry, and physiology - and the mind is somehow nothing but a physical phenomenon. In short, the mind is the brain ... we can (in principle!) account for every mental phenomenon using the same physical principles, laws, and raw materials that suffice to explain radioactivity, continental drift, photosynthesis, reproduction, nutrition and growth.
There are times, Tallis says, when one feels like the poet Robert Browning, 'bouncing up from a table, his mouth full of bread and cheese, saying he means to stand no more blasted nonsense'. What gives his polemic force is the fact that he knows his stuff, as a medical doctor who has also engaged in neuroscientific research and has published papers in the field. He gives a very detailed picture of what is known about the workings of the brain, and the assumptions that are currently being made about it, before going on to demonstrate gross flaws in the orthodox view.
Specifically, he sees an inherent contradiction in trying to find consciousness in nerve impulses, as a property arising out of material events.
Consciousness is, at a basic level, appearances or appearings-to, but neither nerve impulses nor the material world have appearances. So there is absolutely no basis for the assumption, central to Neuromania, that the intrinsically appearance-less material world will flower into appearance to a bit of that world (the brain) as a result of the particular material properties of that bit of the world: for example, its ability to control the passage of sodium ions through semi-permeable membranes. We cannot expect to find anything in a material object, however fashioned, that can explain the difference between a thought and a pebble, or between a supposedly thoughtful brain and a definitely thoughtless kidney...
This makes more obviously barmy the idea that nerve impulses can journey towards a place where they become consciousness; that, by moving from one material place to another they are mysteriously able to be the appearance of things other than themselves. If this is physics, it is not the physics to be found in textbooks.
The enterprise of explaining consciousness faces one challenge in particular - the problem of intentionality. Physical science can explain how the conscious organism can respond to stimuli and send messages to the muscles and glands. However it can provide no clue as to how this flow can be reversed. The brain is not merely acted on, it acts. But what is this 'it'? How is it to be explained?
These questions are easy to lose sight of, especially if, as Tallis suggests, one is a neuromaniac and has a vested interest in concealing it. He is scathing about Daniel Dennett's attempt to explain away intentionality - on the grounds that the inner life we ascribe to others is merely an 'interpretative device' and nothing in reality corresponds to it. On the contrary, he argues, 'it is not out of mere interpretative convenience that we ascribe all sorts of intentional phenomena - perceptions, feelings, thoughts - to people; it is because the intentional phenomena are real, as we know from our own case.'
Then there are the limitations of the functional magnetic resonance imaging (fMRI) technology that produces the pretty pictures. The scans don't directly tap into the brain, as one might imagine from the hype, they merely detect the increases in blood flow needed to deliver additional oxygen to busy neurons. But neuronal activity lasts milliseconds, Tallis points out, while detected changes in blood flow lag by at least two and as many as ten seconds. Furthermore, many millions of neurons have to be activated for this change in blood flow to be detected. So what we see in brain scans is what is happening in one particular area, some time after the activity has commenced.
Small groups of neurons whose activity elicits little change in blood flow, or a modest network of neurons linking large regions, or neurons acting more efficiently than others, may be of great importance but would be under-represented in the scan or not represented at all. In short, pretty well everything relevant to a given response at a given time might be invisible on an fMRI scan.
The design of the studies themselves are 'laughably crude', he argues. Take the famous experiment carried out to observe the brain activity in romantic love, where subjects were first shown a picture of the face of a loved one and then one of a person who was not loved. As anyone knows who has been in love, this hardly scratches the surface of the matter. Romantic love is not a single entity or an enduring state, but encompasses a full gamut of feelings, including lust, awe, surprise, joy, guilt, anger, jealousy, and so on. So although it's superficially interesting the experiment actually tells us very little.
Tallis is particularly scathing about the way academics in the humanities - until recently sceptical of the claims of science - have rushed to embrace Neuromania, developing a whole new line in gobbeldy-gook with which to impress and baffle their readers. An art critic tells us that artist A 'speaks preferentially to cells in regions V1 and V4' while artist B 'stimulates V4 plus the middle frontal convolutions'. A literary critic argues that the effect of Shakespeare's verse 'depends on the specific effects certain syntactic constructions have on the nervous system', finding in one case 'an increase in the amplitude of p600 - a particular wave on the evoked response to stimuli-registering syntactic violations...' etc, etc. Gaah!
Meanwhile neuro-economists believe they have pinpointed the neural bases of bad financial decisions. Why are we so willing to run up debts when we pay by credit card? Answer: brain imaging has shown that paying by credit card reduces activity in the insula, a brain region associated with negative emotions such as worrying about debts. The result is to ensure that your brain is anesthetized against the pain of payment: spending money doesn't feel bad, so you spend more money. In short, the neuro-economist declares, the credit card takes advantage of a dangerous flaw built into the brain. It overvalues immediate gains at the expense of future costs, because it doesn't understand things like interest rates or debt payments of finance charges.
Tallis has scores of these sorts of examples, which, when looked at closely, do nothing more than make blindingly obvious statements about human behaviour. Explaining them in terms of brain functions doesn't explain anything if you accept that humans can override this programming and make sensible choices (with all the corresponding brain activity that is very considerable but entirely ignored by the studies). And of course we do, or we would be mere robots, zombies, automata.
Interestingly for an atheist, Tallis is no less offended by neuro-theology, rebelling against attempts to locate the human propensity for religious belief in some supposed 'God-spot'. Here too the ability to reason, surely the most significant single thing about human consciousness, is powerfully implicated.
What part of the brain, a material object, could one conceive of as cooking up and housing the notion of something infinite, eternal, all powerful, all seeing, all wise and yet systematically invisible? What kinds of nerve impulses are capable of transcending their finite, local, transient, condition in order to conceive of something that is infinite, ubiquitous and eternal? ... Anyone who believes that churches and their institutionally mediated power can be understood in biological terms has to overlook that, unlike gene products but like moral codes, they are argued into place.... I can no more imagine cathedrals being built out of brain tingles than I can see a gene product requiring a Thirty Years' War to defend it.
Some biologizers are aware of this, which is why, instead, they appeal to the concept of memes - 'in a desperate attempt to bridge the great gap, that yawns widest in the case of religion, between animal behaviour and human institutions'. But the meme is merely analogous to a physical property, not in any way a substitute for it.
Aping Mankind also has a lot to say about Darwinitis in this regard, following in the footsteps of the moral philosopher Mary Midgley, an impassioned foe of selfish genery. Much of this is interesting, but the polemic against the standard scientific view of consciousness is what really stands out. It's powerful stuff coming from an atheist neuroscientist, and once I understood just how completely Tallis rejected the conventional wisdom I was all agog to know what he would propose in its place. Not a lot, as it turns out, but he offers three possible alternatives.
One is to acknowledge that humans are inseparable from a community of minds and the worlds that its component selves have built. In this view, consciousness is to be understood in terms of human relations as much as in biology. (Apparently this trend has been picked up by the MIT, once the capital of mind-brain identity theory.) This is an improvement, he thinks, but still leaves the brain at the 'ontological heart of the human world'. Another approach is to appeal to quantum mechanics, but Tallis has particular reasons for being unpersuaded (he quickly dismisses the ideas of Hameroff and Penrose in this regard). The third is to follow David Chalmers into panpsychism, the notion that consciousness is present throughout the entire universe, which he notes has a certain logic, and is close to the views of the respected British philosopher (and atheist) Galen Strawson. For himself, he concludes, he is content to remain an 'ontological agnostic'.
It would be nice to think that the book will make waves in neuroscientific circles. Alas, I suspect Tallis will just be brushed off as an eccentric - of course the mind is the brain, no right thinking person could possibly think any different. The dogma is too entrenched to be seriously argued with. To his claim - detailed and elegantly expressed - that consciousness is far too complicated to be explained in terms of brain functions the response will most likely be, 'No it isn't!'. At this early stage so much is speculative, there's little chance of anyone being proved wrong. I'm not sure either that it will dissuade journalists from continuing to gush over every new 'discovery' of how we humans are really are really what our brains are doing. The glamour of science has them in its grip.
But I think for the rest of us - and potentially we are a large constituency - the book is a landmark. We're tired of being talked down to by materialist scientists and philosophers, our ideas of being more than our bodies lampooned as 'folk psychology'. Without going so far as to claim that Tallis has proved that consciousness can't be pinned down to brain functions he has provided a great deal of heft to the claim, and arguably made it every bit as persuasive an 'explanation' as Daniel Dennett's.