The recent movie Transcendence will not be troubling the sci-fi canon of classics, if the reviews are anything to go by. But its central plot device uploading a human consciousness to a computer remains both a central aspiration of transhumanists, and a source of queasy fascination to the rest of us. The idea is that someones mind is simply a computer programme, that in the future could be run on a much more powerful computer than a brain, just as one might run an old arcade game on a modern PC in emulation mode. Mind uploading has a clear appeal for people who wish to escape the constraints of our flesh and blood existence, notably the constraint of our inevitable mortality.
In this post I want to consider two questions about mind uploading, from my perspective as a scientist. Im going to use as an operational definition of uploading a mind the requirement that we can carry out a computer simulation of the activity of the brain in question that is indistinguishable in its outputs from the brain itself. For this, we would need to be able to determine the state of an individuals brain to sufficient accuracy that it would be possible to run a simulation that accurately predicted the future behaviour of that individual and would convince an external observer that it faithfully captured the individuals identity. Im entirely aware that this operational definition already glosses over some deep conceptual questions, but its a good concrete starting point. My first question is whether it will be possible to upload the mind of anyone reading this now. My answer to this is no, with a high degree of probability, given what we know now about how the brain works, what we can do now technologically, and what technological advances are likely in our lifetimes. My second question is whether it will ever be possible to upload a mind, or whether there is some point of principle that will always make this impossible. Im obviously much less certain about this, but I remain sceptical.
This will be a long post, going into some technical detail. To summarise my argument, I start by asking whether or when it will be possible to map out the wiring diagram of an individuals brain the map of all the connections between its 100 billion or so neurons. Well probably be able to achieve this mapping in the coming decades, but only for a dead and sectioned brain; the challenges for mapping out a living brain at sub-micron scales look very hard. Then well ask some fundamental questions about what it means to simulate a brain. Simulating brains at the levels of neurons and synapses requires the input of phenomenological equations, whose parameters vary across the components of the brain and change with time, and are inaccessible to in-vivo experiment. Unlike artificial computers, there is no clean digital abstraction layer in the brain; given the biological history of nervous systems as evolved, rather than designed, systems, theres no reason to expect one. The fundamental unit of biological information processing is the molecule, rather than any higher level structure like a neuron or a synapse; molecular level information processing evolved very early in the history of life. Living organisms sense their environment, they react to what they are sensing by changing the way they behave, and if they are able to, by changing the environment too. This kind of information processing, unsurprisingly, remains central to all organisms, humans included, and this means that a true simulation of the brain would need to be carried out at the molecular scale, rather than the cellular scale. The scale of the necessary simulation is out of reach of any currently foreseeable advance in computing power. Finally I will conclude with some much more speculative thoughts about the central role of randomness in biological information processing. Ill ask where this randomness comes from, finding an ultimate origin in quantum mechanical fluctuations, and speculate about what in-principle implications that might have on the simulation of consciousness.
Why would people think mind uploading will be possible in our lifetimes, given the scientific implausibility of this suggestion? I ascribe this to a combination of over-literal interpretation of some prevalent metaphors about the brain, over-optimistic projections of the speed of technological advance, a lack of clear thinking about the difference between evolved and designed systems, and above all wishful thinking arising from peoples obvious aversion to death and oblivion.
On science and metaphors
I need to make a couple of preliminary comments to begin with. First, while Im sure theres a great deal more biology to learn about how the brain works, I dont see yet that theres any cause to suppose we need fundamentally new physics to understand it. Of course, new discoveries may change everything, but it seems to me that the physics weve got is quite complicated enough, and this discussion will be couched entirely in currently known, fundamentally physicalist, principles.
The second point is that, to get anywhere in this discussion, were going to need to immunise ourselves against the way in which almost all popular discussion of neuroscience is carried out in metaphorical language. Metaphors used clearly and well are powerful aids to understanding, but when we take them too literally they can be badly misleading. Its an interesting historical reflection that when computers were new and unfamiliar, the metaphorical traffic led from biological brains to electronic computers. Since computers were popularly described as electronic brains, its not surprising that biological metaphors like memory were quickly naturalised in the way computers were described. But now the metaphors go the other way, and we think about the brain as if it were a computer (I think the brain is a computer, by the way, but its a computer thats so different to man-made ones, so plastic and mutable, so much immersed in and responsive to its environment, that comparisons with the computers we know about are bound to be misleading). So if what we are discussing is how easy or possible it will be to emulate the brain with a man-made computer, the fact that we are so accustomed to metaphorical descriptions of brains in terms of man-made computers will naturally bias us to positive answers. Its too easy to move from saying a neuron is analogous to a simple combination of logic gates in a computer, say, to thinking that it can be replaced by one. A further problem is that many of these metaphors are now so stale and worn out that they have lost all force, and the substance of the original comparison has been forgotten. We often hear, for example, the assertion that some characteristic or other is hard-wired in the brain, but if one stops to think what an animals brain looks and feels like theres nothing much hard about it. Its a soft machine.
Mapping the brains wiring diagram
One metaphor that is important is the idea that the brain has a wiring diagram. The human brain has about 100 billion neurons, each of which is connected to many others by thin fibres the axons and dendrites along which electrical signals pass. Theres about 100,000 miles of axon in a brain, connecting at between a hundred to a thousand trillion synaptic connections. Its this pattern of connectivity between the neurons through the axons and dendrites that constitutes the wiring diagram of the brain. Ill argue below that knowing this wiring diagram is not yet a sufficient condition for simulating the operation of a brain it must surely, however, be a necessary one.
So far, scientists have successfully mapped out the wiring diagram of one organisms nervous system the microscopic worm C. elegans, which has a total of 300 neurons. This achievement was itself a technical tour-de-force, which illustrates what would need to be done to determine the immeasurably more complex wiring diagram of the human brain. The issue is that these fibres are thin (hundreds of nanometers, for the thinnest of them), very densely packed, and the fibres from a single neuron can pervade a very large volume (this review in Science The Big and the Small: Challenges of Imaging the Brains Circuits ($) is an excellent up-to-date overview of whats possible now and what the challenges are). Currently electron microscopy is required to resolve the finest connections, and this can only be done on thin sections. Although new high resolution imaging techniques may well be developed, its difficult to see how this requirement to image section by section will go away. Magnetic resonance imaging, on the other hand, can image an intact brain, but at much lower resolution more like millimetres than nanometers. The resolution of MRI derives from the strength of the magnetic field gradient you can sustain. You can have a large gradient over a small volume but if youre constrained to keep the brain intact that provides quite a hard limit.
Proponents of mind uploading who recognise these difficulties at this point resort to the idea of nanobots crawling through the brain, reading it from the inside. Ive discussed at length why I think it will be very much more difficult than people think to create such nanobots, for example in my article Rupturing the Nanotech Rapture, and in Nanobots, nanomedicine, Kurzweil, Freitas and Merkle I discuss why I dont think the counter-arguments of their proponents are convincing.
Mapping out all the neural connections of a human brain, then, will be difficult. It probably will be done, on a timescale perhaps of decades. The big but, though, is that this mapping will be destructive, and the brain it is done on will be definitively dead before the process starts. And massive job though it will be to map out this micro-scale connectome, theres something very important it doesnt tell you the difference between a live brain and a dead lump of meat that is what the initial electrical state of the brain is, where the ion gradients are, what the molecules are doing. But more on molecules later
Modelling, simulation, emulation: why mind uploading might make sense if you believed in intelligent design
If you did have a map of all the neural connections of a human brain, dead or alive, is that enough to simulate it? You could combine the map with known equations for the propagation of electrical signals along axons (the Hodgkin-Huxley equations), models of neurons and models for the behaviour of synapses. This is the level of simulation, for example, carried out in the Blue Brain project (see this review (PDF) for a semi-technical overview). This is a very interesting thing to do from the point of neuroscience, but it is not a simulation of a human brain, and certainly not of any individuals brain. Its a model, which aggregates phenomenological descriptions of the collective behaviours and interactions of components like the many varieties of voltage gated ion channels and the synaptic vesicles. The equations youd use to model an individual synapse, for example, would have different parameters for different synapses, and these parameters change with time (and in response to the information being processed). Without an understanding of whats going on in the neuron at the molecular level, these are parameters you would need to measure experimentally for each synapse.
An analogy might make this clearer. Let me ask this question: is it possible to simulate the CPU in your mobile phone? At first sight this seems a stupid question of course one can predict with a very high degree of certainty what the outputs of the CPU would be for any given set of inputs. After all, the engineers at ARM will have done just such simulations before any of the designs had even been manufactured, using well-understood and reliable design software. But a sceptical physicist might point out that every CPU is different at the atomic level, due to the inherent finite tolerances of manufacturing, and in any case the scale of the system is much too large to be able to simulate at the quantum mechanical level that would be needed to capture the electronic characteristics of the device.
In this case, of course, the engineers are right, for all practical purposes. This is because the phenomenology that predicts the behaviour of individual circuit elements is well-understood in terms of the physics, and the way these elements behave is simple, reliable and robust robust in the sense that quite a lot of variation in the atomic configuration produces the same outcomes. We can think of the system as having three distinct levels of description. There is the detailed level of what the electrons and ions are doing, which would account for the basic electrical properties of the component semiconductors and insulators, and the junctions and interfaces between them. Then there is the behaviour of the circuit elements that are built from these materials the current-voltage characteristics of the field effect transistors, and the way these components are built up into circuits. And finally, there is a description at a digital level, in which logical operations are implemented. Once one has designed circuit elements with clear thresholds and strongly non-linear behaviour, one can rely on there being a clean separation between the digital and physical levels. Its this clean separation between the physical and the digital that makes the job of emulating the behaviour of one type of CPU on another one relatively uncomplicated.
But this separation between the physical and the digital in an integrated circuit isnt an accident or something pre-ordained it happens because weve designed it to be that way. For those of us who dont accept the idea of intelligent design in biology, thats not true for brains. There is no clean digital abstraction layer in a brain why should there be, unless someone designed it that way? In a brain, for example, the digital is continually remodelling the physical we see changes in connectivity and changes in synaptic strength as a consequence of the information being processed, changes, that as we see, are the manifestation of substantial physical changes, at the molecular level, in the neurons and synapses.
The unit of biological information processing is the molecule
Is there any general principle that underlies biological information processing, in the brain and elsewhere, that would help us understand what ionic conduction, synaptic response, learning and so on have in common? I believe there is underlying all these phenomena are processes of macromolecular shape change in response to a changing local environment. Ion channel proteins change shape in response to the electric field across the membrane, opening or closing pores; at the synapse shape-changing proteins respond to electrical changes to trigger the bursting open of synaptic vesicles to release the neurotransmitters, which themselves bind to protein receptors to transmit their signal, and complicated sequences of protein shape changes underlie the signalling networks that strengthen and weaken synaptic responses to make memory, remodelling the connections between neurons.
This emphasises that the fundamental unit of biological information processing is not the neuron or the synapse, its the molecule. Dennis Bray, in an important 1995 paper Protein molecules as computational elements in living cells, pointed out that a protein molecule can act as a logic gate through the process of allostery its catalytic activity is modified by the presence or absence of bound chemicals. In this chemical version of logic, the inputs are the presence or absence of certain small molecules, and the outputs are the molecules that the protein produces, in the presence of the right input chemicals, by catalysis. As these output chemicals can themselves be the inputs to other protein logic gates, complex computational networks linking the inputs and outputs of many different logic gates can be built up. The ultimate inputs of these circuits will be environmental cues the presence or absence of chemicals or other environmental triggers detected by molecular sensors at the surface of the cells. The ultimate outputs can be short-term to activate a molecular motor so that a cell swims towards a food source or away from a toxin. Or they can be long term, in activating and deactivating different genes so that the cell builds different structures for itself, or even changes the entire direction of its development.
This is how a single celled organism like an amoeba can exhibit behaviour that is in effect purposeful, that is adaptive to the clues it detects from the environment around it. All living cells process information this way. In the collective alliance of cells that makes up a multi-cellular organism like a human, all our cells have the ability to process information. The particular cells that specialise in doing information processing and long-ranged communication the neurons start out with the general capability for computation that all cells have, but through evolution have developed this capability to a higher degree and added to it some new tricks. The most important of these new tricks is an ability to control the flow of ions across a membrane in a way that modifies the membrane potential, allowing information to be carried over long distances by the passage of shock waves of membrane potential, and communications to be made between neurons in response to these rapid changes in membrane potential through the release of chemicals at synapses. But, as always happens in evolved systems, these are new tricks built on the old hardware and old design principles molecules whose shape changes in response to changes in their environment, this shape change producing functional effects (such as the opening of an ion channel in response to a change in membrane potential).
The molecular basis of biological information processing emphasises the limitations of the wiring metaphor. Determining the location and connectivity of individual neurons, or the connectome as its begun to be called in neuroscience is necessary, but far from sufficient condition for specifying the informational state of the brain; to do that completely requires us to know where the relevant molecules are, how many of them are present, and what state theyre in.
The brain, randomness, and quantum mechanics
The molecular basis of biological computation means that it isnt deterministic, its stochastic, its random. This randomness isnt an accidental add-on, its intrinsic to the way molecular information processing works. Any molecule in a warm, wet watery environment like the cell is constantly bombarded by its neighbouring water molecules, and this bombardment leads to the constant jiggling we call Brownian motion. But its exactly the same bombardment that drives the molecule to change shape when its environment changes. So if we simulate, at the molecular level, the key parts of the information processing system of the brain, like the ion channels or the synaptic vesicles, or the broader cell signalling mechanisms by which the neurons remodel themselves in response to the information they carry, we need to explicitly include that randomness.
I want to speculate here about what the implications are of this inherently random character of biological information processing. A great deal has been written about randomness, determinism and the possibility of free will, and Im largely going to avoid these tricky issues. I will make one important point, though. It seems to me that all the agonising about whether the idea of free will is compatible with a brain that operates through deterministic physics is completely misplaced, because the brain just doesnt operate through deterministic physics.
In a computer simulation, wed build in the randomness by calls to a pseudo-random number generator, as we compute the noise term in the Langevin equation that would describe, for example, the internal motions of an receptor protein docking with a neurotransmitter molecule. In the real world, the question we have to answer is whether this randomness is simply a reflection of our lack of knowledge? Does it simply arise from a decision we make not to keep track of every detail of each molecular motion in a very complex systems? Or is it real randomness, that is intrinsic to the fundamental physics, and in particular from the quantum mechanical character of reality? I think it is real randomness, whose origins can be traced back to quantum fluctuations.
To be clear, Im not claiming here that the brain is a quantum computer, in the sense that it exploits quantum coherence in the way suggested by Roger Penrose. It seems to me difficult to understand how sufficient coherence could be maintained in the warm and wet environment of the cell. Instead, I want to focus on the origin of the forces between atoms and molecules. Attractions between uncharged molecules arise from the van der Waals force, which is most fundamentally understood as a fluctuation force, a force that arises from the way randomly fluctuating fields are are modified by atoms and molecules. The fluctuating fields in question are the zero-point and thermal fluctuations of the electromagnetic field of the vacuum. Because the van der Waals force arises from quantum fluctuations, the force itself is fluctuating, and (see my earlier post Where the randomness comes from) these random fluctuations, of quantum origin, are sufficient to account for the randomness of the warm, wet nanoscale world.
The complexity theorist Scott Aaronson has recently written an interesting, but highly speculative essay that touches on these issues The Ghost in the Quantum Turing Machine (PDF). Aaronson argues that there is a type of unpredictability about the universe today that arises from the quantum unknowability of the initial conditions of the universe. He evokes the quantum no-cloning principle to argue that quantum state functions that have evolved unitarily, without decoherence, from the beginning of the universe he calls these freebits have a different character of uncertainty to the normal types of randomness we deal with using probability distributions. The question then is whether the fundamental unpredictability of freebits could be connected to some fundamental unpredictability of the decisions made by a human mind. Aaronson suggests it could, if there were a way in which the randomness inherent in the molecular processes underlying the operation of the brain such as the opening and closing of ion channels could be traced back to quantum uncertainty. My own suggestion is that the origin of van der Waals forces, as a fluctuation force, in the quantum fluctuations of the vacuum electromagnetic field, offers the connection that Aaronson is looking for.
If Aaronson is correct that his freebit picture shows how the fundamental unknowability of the quantum initial conditions of the universe translate into a fundamental unpredictability of certain physical processes now, and I am correct in my suggestion that the origins of the van der Waals force in the quantum fluctuations of fields provide a route through which such unpredictability translates into the outcomes of physical processes in the brain, then this provides an argument for mind uploading being impossible in principle. This is a conclusion I suggest only very tentatively.
Your mind will not be uploaded: dealing with it
But theres nothing tentative about my conclusion that if you are alive now, your mind will not be uploaded. What comforts does this leave for those fearing oblivion and the void, but reluctant to engage with the traditional consolations of religion and philosophy? Transhumanists have two cards left to play.
Cryonics offers the promise of putting your brain in a deep freeze to wait for technology to catch up with the challenges of uploading. Its clear that a piece of biological tissue that has formed a glass at -192 C will, if kept at that temperature, remain in that state indefinitely without significant molecular rearrangements. The question is how much information is lost in the interval between clinical death and achieving that uniform low temperature, as a consequence both of the inevitable return to equilibrium once living systems fail, and of the physical effects of rapid cooling. Physiological structures may survive, but as weve seen, its at the molecular level that the fundamentals of biological information processing take place, and current procedures will undoubtedly be highly perturbing at this level. All this leaves aside, of course, the sociological questions about why a future society, even if it has succeeded in overcoming the massive technical obstacles to characterising the brain at the molecular level, would wish to expend resources in reanimating the consciousnesses of the particular individuals who now choose this method of corporeal preservation.
The second possibility that appeals to transhumanists is that we are on the verge of a revolution in radical life extension. Its unquestionably true, of course, that improvements in public health, typical lifestyles and medical techniques have led to year-on-year increases in life expectancy, but this is driven mostly by reducing premature death. The increasingly prevalent diseases of old age particularly neurodegenerative diseases like Alzheimers seem as intractable as ever; we dont even have a firm understanding of their causes, let alone working therapies. While substantial fractions of our older people are suffering from cruel and incurable dementias, the idea of radical life extension seems to me to be a hollow joke.
Why should I worry about what transhumanists, or any else, believes in? As I began to discuss at the end of my last post, Transhumanism has never been modern, I dont think the consequences of transhumanist thinking are entirely benign, and Ill expand on that in a later post. But there is a very specific concern about science policy that I would like to conclude with. Radical ideas like mind uploading are not part of the scientific mainstream, but there is a danger that they can still end up distorting scientific priorities. Popular science books, TED talks and the like flirt around such ideas and give them currency, if not credibility, adding fuel to the Economy of Promises that influences and distorts the way resources are allocated between different scientific fields. Scientists doing computational neuroscience dont themselves have to claim that their work will lead to mind uploading to benefit from an environment in which such claims are entertained by people like Ray Kurzweil, with a wide readership and some technical credibility. I think computational neuroscience will lead to some fascinating new science, but you could certainly question the proportionality of the resource it will receive compared to, say, more experimental work to understand the causes of neurodegenerative diseases.
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