Neuropolitics

Neuropolitics

I quite like the idea of neuropolitics, despite its air of science fiction. I don’t like the idea of neuroethics or neurophilosophy or even neuropsychology, but I see a point to couching political discourse in neurological language. What is the unit (the ontology) of political discourse? It goes by various names: men, people, human beings, sentient creatures, individuals, souls, persons, selves. These are not always co-referential or analytically pellucid, but one catches the drift. We are talking about you, me, him, her, they, etc. Can we be more exact, more scientific? Well, a very decent suggestion is that all these, in so far as they impinge on politics, ultimately go back to the brain: for the brain is the organ of the mind, selfhood, character, the psyche—and that is what has ultimate value. We could have a polity composed wholly of disembodied brains, so long as personhood is preserved, but a politics of bodies sans brains is pointless—psychologically null zombies. Political issues concern, in the end, functioning brains (living, feeling brains). So what, you may say, what difference does it make?  What political problems would be solved or mitigated by adopting a neurological perspective? How would our politics be improved by going neuropolitical?

The answer is that brains are detached from the outer shell in which they are housed: they don’t reflect the body or the position of that body in the world. You can’t read off a person’s size, shape, race, nationality, wealth, education, etc. just by perusing their brain. All brains look alike (all human brains). There are no black brains or white brains, no fat brains or thin brains, no beautiful brains or ugly brains—unlike with bodies. The brain is a great equalizer (I am talking about its physical appearance). Thus, no discrimination based on brain appearances is possible: the brain of Marilyn Monroe looks much the same as the brain of Louis Armstrong—nor do they sound any different. It would be hard to be prejudiced in favor of one of them and against the other, based on optical appearances. There would be no color prejudice in a society of brains in vats, or pulchritude prejudice, or weight prejudice. Everyone would be treated equally based on physical appearance; discriminations would have to reflect less palpable features, such as quality of character or mathematical ability. Brains don’t invite irrational groundless discrimination. Behind every face there is a brain just like yours, constituting the essence of the person. We don’t normally think of this in our personal interactions, but it is salutary to remind ourselves of it. Politically, it is the objective truth. Brains are what politics is ultimately all about—the things with rights, obligations, citizenship, equality, authority, moral status. The body politic is a body of brains.

In a way this is unfortunate, because our image of a person is shaped much more by the face than the brain. We don’t even see the brain in the ordinary course of events. Nor is the brain deemed attractive or expressive or relatable. It has no name, no social identity. It would be different if brains were visible and revealing; then their centrality would be evident. Neuropolitics would be the order of the day. Laws would be about them, policies geared to them; they would be the primary units of political discourse. As it is, they don’t even have the benefit of verbal cache—the word brain is not an attractive word. It doesn’t do justice to what it describes. In Latin we have cerebrum, in Greek encephalo (“in-head”), in French le cerveau, in Italian ingegno, in Finnish aivot. There is nothing warm and cuddly about these. We could try calling it the self-hub or the person-crux, but these don’t really cut it; we are stuck with a distinct lack of linguistic glamor. Brains are just not aesthetically pleasing to us. The heart has a much better public image. Perhaps an artist could undertake a series of brain works designed to lift brains to a new plane of visual appeal—introducing us to the brain afresh (“The Brain of Mona Lisa”). We need celebrity brains on magazine covers—brain paparazzi, PR campaigns.

How do animals fare under neuropolitics? I think it is clear that speciesism is fueled by the animal body: their bodies are not like ours (to the naked eye). They are hairy, scaly, feathered, quadrupedal, slimy. But their brains are not that different: when you look at a picture of an animal brain its affinity to the human brain is evident, startlingly so. All brains have much the same basic architecture (not surprising given the facts of evolution). We would not be so inclined to speciesism if we had animal brains constantly in our thoughts: never mind the body, look at the brain! The brain is the seat of the soul, and their brains closely resemble ours. They also differ among themselves to a degree, correlated with their psychological powers; these anatomical differences can be used to justify differential treatment. Apes and lizards are not identical mentally. I think, then, that a brain-centered animal politics will help animals in their quest for political freedom. The brain is always the best measure of a creature’s natural rights, because it is closely correlated with the animal’s mental faculties. The mind is not visible and is hard to detect, but the brain is the concrete symbol of the mind—you can get your teeth into the brain. A politics arranged according to brain structure will be an improvement over our current body-centered approach. Here is my political slogan: Make the World Brainier![1]

[1] To what extent is this essay tongue-in-cheek? Less than you might think. The culture can change. Words matter. Ideology is conceptualization.

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Equality and Humanity

Equality and Humanity

We are told that all men are created equal. This dictum takes some parsing.[1] First, there is the word “men”: surely, we don’t mean to exclude women and children, neither of whom are men. This is easily done: swap the word “men” for “human beings” or “members of the human race”—this is clearly what is intended. Less clearly, what is the force of “created”? The dictum doesn’t say all men are equal; it says they were created that way. Does this presuppose theism and creationism? Do humans need to have a Creator in order to be considered equal? We can fix this problem by extending the notion of creation to non-supernatural creation—as in creation by Darwinian selection (or by alien beings). So, we get: all humans are created by natural selection equal (or God or aliens or chance). We could paraphrase this as “all humans are born equal”. All human babies are equal, or fetuses, or fertilized eggs. They may not end up equal, but they were born that way—this is how they came into the world. I think we should take this use of “created” seriously—all humans are created equal, not actually equal in the fullness of time. But the more troublesome question is the use of “equal”: it means the same, as in “being the same in quantity, size, degree, value, or status” (OED). Are all babies born the same size? Obviously not. Are they the same in color? No. Are they the same in IQ or musical potential? Probably not. They differ in many ways—they are not “equal”. So, is the dictum simply false? Many people have supposed so, and not without reason. The question is how to restrict the equality to something genuinely identical in all human infants. The traits generally supposed relevant here are intelligence and physical abilities, but then the claim is contentious at best and dependent on scientific knowledge we may not possess. We need to find traits that are universal in the human species, so that we can say “All human beings are born the same in respects X, Y, and Z”. What traits are invariant across human beings and built in from the beginning? Some have felt that this is a quixotic question—for there are no such traits. Then what are equal natural rights based on?

What human traits are independent of race, birth, education, and luck? What are we all born sharing? That is the question. Fortunately, it has an answer: consciousness and language. All (normal) humans have the same degree and type of consciousness; and all speak a language, essentially the same language. They are equalin these respects. By “consciousness” I simply mean the range of subjective states available to the person (or animal)—all the ways he or she can sense and feel. We can divide these into the perceptual and the emotional: the ways the individual can sense the world and the ways he or she can feel about it. In particular, consciousness will include the ability to be happy or unhappy: the pursuit of happiness essentially involves the ability consciously to feel happiness, or its lack. Well-being is bound up with consciousness of well-being. Then the idea is that different types of human being don’t significantly differ in their available states of consciousness; it isn’t that some humans have much less consciousness than others. All humans are created with basically the same consciousness profile—as is true of other species (all elephants sense and feel much the same way as other elephants, give or take some). In the case of language, all (normal) humans possess a language, used in speech and thought. There are no speechless subspecies of humans, or primitive languages, or intellectually superior languages. We are all born to speak a language of comparable complexity to other human languages. Thus, we are all born with the capacity for infinite linguistic creativity (impressively so). We are linguistic equals—all born the same way linguistically. Language is a human universal, like the bipedal gait. We can thus gloss our original dictum as follows: All human beings are born equal (the same) with respect to consciousness and language. That is a true statement, unlike others that have been made (people are blank slates, no one genetically has a higher IQ than anyone else, etc.). And I think this is what proponents of the dictum tacitly have in mind, though they may not know it.[2]

The question now is whether this is sufficient to ground the existence of natural moral and political rights. I think it is. Consciousness gives us basic rights to freedom from torment and confinement (same for other animals); language gives us a range of rights commensurate with our distinctive human nature—rights not shared by other sentient animals. Animals have some natural rights, specifically in relation to suffering; but language is necessary for many legal rights to apply to us, such as the right to due process of law (including the right to a hearing and a defense). There is no need to appeal to God-given rights or across-the-board equality or legal stipulations regarding “persons”. We really are equal with respect to consciousness and language, and they ground our moral and legal rights as human beings. It is correct to say that these traits are biological: we are biologically identical in the respects in question. So, humans are biologically equal in these respects, where this equality justifies attributions of rights. That was the great political discovery of the Enlightenment, which led to democracy and a better world for all (though not yet animals). We began to see past social hierarchies, wealth differentials, surface glitter, good fortune, physical appearance, and history; we recognized the deeper qualities of inner consciousness and linguistic mastery. On the inside people are much the same in their basic make-up; there is a shared core species identity. Perhaps the philosophy and science of the age smoothed the way for these perceptions—the human mind came into clearer focus. Politics had to be more inwardly directed, more geared to actual psychology.[3]

[1] I am not attempting to interpret the use of this phrase in the Declaration of Independence or the Constitution, in which equality of rights occupies center stage. I am concerned with the more general principle of human equality—that all men are fundamentally alike (and thus have equal rights). It seems to me that the historical documents rather conflate these two meanings. The assumption is evidently that all men desire life, liberty, and the pursuit of happiness—a factual not normative proposition.

[2] I suppose there would be no objection to rephrasing the dictum to fit modern sensibilities, as in: All humans are born with basically the same brain. For the brain is the basis of both consciousness and language, and it is common to all types of human (unlike skin color, inherited wealth, good table manners, etc.). Let me also note that differences of human IQ, though they seem significant to us, are negligible when viewed from the perspective of other species—we are all geniuses when compared to our nearest biological kin.

[3] The universality of language in the human species has been a longstanding theme of Noam Chomsky; I am adding a comparable claim about consciousness, viz. humans have a mode of consciousness that is universally shared among us. Universal grammar and universal phenomenology: these are the two poles of human nature and hence human rights. People differ in all sorts of ways, but they are the same in these ways (of course not down to the last detail). Size, shape, and color don’t matter.

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Can We Solve the No-Mind-Body Problem?

Can We Solve the No-Mind-Body Problem?

We usually ask what gives rise to the mind in the body—what the secret ingredient is. This is the positive mind-body problem. But there is also the negative mind-body problem: what explains the lack of mind. Some things have a mind (consciousness) and some things lack it—what is the difference? In particular, what disqualifies an object from having a mind: in virtue of what do some objects lack minds? A behaviorist will say it is the lack of behavior (of a certain kind, say goal-directed movement); but that is not plausible, because of organisms that behave but don’t (we think) have sentience—jellyfish, flies, worms. Also, there are artifacts like robots. The same is true of brains and neurons: it isn’t the lack of these that explains the absence of mind, since they can be present without a hint of consciousness. And it obviously isn’t the lack of fur or legs, because an animal can be conscious without these. Evidently, it is a rather elusive property. The panpsychist will say it is the lack of proto-mental properties at the atomic level, but then everything will be conscious to some degree. There will be nothing stopping even simple organisms from being conscious; being conscious will be the norm, the natural state of nature. But at least these are attempts to explain why mind is absent in certain cases: it is the lack of factor X. According to idealist theories, the problem is not so much to explain the presence of consciousness as its absence—for consciousness is everywhere. There is no material body to present a mind-body problem.

And the absence problem isn’t purely theoretical: we really do need to explain why consciousness is absent when it is. For we don’t really know that consciousness is not more widespread than we tend to suppose (in our Western mind-set). We don’t really know insects are not conscious; we just presume so (on the basis of reasonable but inconclusive evidence). Many people feel convinced that trees have feelings, and we have no definitive way to rebut them. What about the soul of planet Earth? Where do we draw the line in the biological world? It would be nice to have a clear marker with which we could rule out the cases that strike us intuitively as not exhibiting consciousness. We have an other non-minds problem as well as an other minds problem: we don’t know what things have them, and we don’t know what things don’t have them. We know what the absence of heat (coldness) results from, i.e., lack of molecular motion; and we know what signals the absence of life, i.e., lack of a pulse. But we don’t know what causes, or marks, a lack of consciousness. In dreamless sleep and coma, consciousness is lacking, presumably as a result of brain activity of some sort: but what sort? Could it be that nature is naturally and spontaneously conscious (as panpsychists suppose) and that it takes a suppressive agent to inhibit its expression? Then we really would need an explanation of its absence in lower organisms. It looks as if both presence and absence need an explanation. In the case of bodily movement, we can explain presence and absence: it is nerve innervation and muscular contraction, or nerve damage and muscular unresponsiveness (or just the lack of nerves and muscles). Why are some parts of the brain notconscious—what do they lack that other parts possess? Why are some neurons mentally dead, given that some are alive?

It is a mystery why brains are conscious, but also a mystery why other things are not (they look basically the same as conscious things); indeed, these are really aspects of the same mystery. We can call it the mystery of non-consciousness. The problem of other minds is the same: why are these things said to be conscious and those things said not to be? How can we refute the skeptic about other minds and the skeptic about other non-minds (this skeptic says we have no right to assume that rocks and tables are not conscious). A prehistoric animist might be more exercised about the negative problem than the former: he wants to know why we don’t ascribe minds more widely. After all, people have been wrong in the past in declaring certain animals devoid of mind—might we expand our attributions even more widely? There are really two sides to the other minds problem: positive and negative. Maybe if we focused on the negative problem, we would make more progress: why are some organisms not conscious? If we knew that, we would know why some are. Mysterians would find both problems equally difficult. It is an interesting fact that we tend to think of consciousness as requiring some sort of superhuman effort on the part of the body, instead of supposing that its absence is what requires positive action—inhibition not excitation, to borrow physiological terminology. Certainly, for the panpsychist, it is a problem to explain how it is that everything is not conscious, given that everything has the seeds of consciousness in it. It is as if God decided to block the efflorescence of the underlying consciousness of the cosmos from occurring more visibly. It is the same with behaviorism and materialism: what prevents behavior and the brain from indicating consciousness? If the mind is behavior or neural activity, then it exists wherever they do—it requires an explanation to understand why we don’t see it that way. Once the body is endowed with attributes that (allegedly) constitute consciousness, we have a problem explaining why everything with those attributes isn’t conscious. This is the (non-mind)-body problem[1].

[1] Suppose we accept Descartes’s theory of mind: how do we explain why primitive organisms and even physical objects are not conscious? For all that is necessary is the contingent conjoining of an immaterial mind with some sort of physical object. Yet we never come across such cases. Descartes can’t explain why non-conscious things exist, given his metaphysics. Why doesn’t every physical object have its attached mental substance? A complex brain isn’t a necessary condition, according to his metaphysics.

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ABC Interview

ABC Interview

The interview last night of President Trump by Terry Moran of ABC News was an unbelievable display of petulance, egotism, mendacity, vindictiveness, and rank stupidity. It was an embarrassment to the country. The man’s mind is a slag heap of prejudices, stereotypes, grievances, vague generalities, and petty rivalry. He appears to lack a brain. Do you think I am exaggerating? Then consider two nadirs of the whole performance. First, when questioned about the lack of due process in cases of deportation, he demonstrated a complete lack of understanding of the concept and hence of the nature of the law. All he could say was that that the deported individuals were given “a process”. He is certifiably legally illiterate, startlingly so. Second, and even worse, he insisted that he had photographic proof of the guilt of Abrego Garcia in the form of “MS13” tattooed on his knuckles. He kept repeating this as if it was indisputable. When Moran suggested it might be photoshopped he merely “doubled down” (to me these letters looked clearly superimposed). What is so deplorable about this is that he couldn’t even imagine the mere possibility that this “evidence” might not be probative. He seemed incapable of even the most elementary ability to evaluate evidence; and he was prepared to destroy a man’s life based on highly dubious “evidence”. His constant reference to President Biden showed the puerility of character we have seen so often. Nothing he said was remotely cogent, reasoned, or even properly formulated. He is unusual even by the standards of the most egregious ignoramus. He absolutely refuses to engage with awkward questions. There is no thought process, just affect-driven reflexes. Psychologically, he is in a class of his own. He understands nothing, but he isn’t going to let that stop him.

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A Reply about Worlds

This is a reply I wrote to an email from Tom Nagel. It may be helpful even without his prompting email.

A Reply

My OED gives as the primary meaning of “world” “the earth with all its countries and peoples”, immediately followed by “one’s life and activities”. The first is not philosophically relevant except as indicating that the word has a very narrow denotation reflecting human interests. The second makes this explicit. I’m not focusing on the individual but on the reference to some sort of life or consciousness. It is surely clear that using the word to refer to the whole shebang is an extension of this use (arguably illicit). It’s not necessarily human but can refer to an animal’s world.

I don’t think “the world” means “everything”, which anyway raises similar difficulties. First, it’s a quantifier word not a singular term, and applying Russell’s theory to “the world” does not give us “everything”. Second, what is meant by “thing”—does it mean objects or facts or something else? Third, quantification is generally restricted and sortal-relative; this isn’t. Fourth, how does it apply to such uses as “possible world” or “many worlds”? Fifth, “everything” is non-descriptive and non-specific, unlike “the world” (this uses “world” in the sense derived from the primary meaning of the term). Sixth, can we say “for all everythings”? Seventh, does everything include non-existent entities? You can quantify over these (“All fictional characters…”) but they are not part of the world, which must exist. Lewis thought a possible world was a big concrete particular like the actual world—how does this fit with the “everything” interpretation? Eighth, the whole point of the philosophical locution is to strip away any reference to humans or other living beings, but “everything” carries no such connotation. The philosophical use is just not the same as the use of “everything”. In fact, the context-independent use of “everything” is clearly a (possibly illicit) extension of restricted uses of the universal quantifier and is not primitive (this is why Geach deplored it).

It may be that there is some inchoate concept (and entity) that is ineptly expressed by “the world”—we do seem to have a need for some such idea. But this concept is highly problematic and cannot be invoked uncritically or without scare-quotes. We don’t really have any good word for it, and possibly can’t invent one. It is just an empty designator that has a reference we can’t properly grasp. It isn’t just an easy familiar concept like “every dog”. It’s not part of ordinary language but a philosophical contraption that sounds familiar.

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The World

The World

The word “world” is a slippery customer. It seems to have two meanings, ordinary and philosophical. In one use it refers to one’s world-view or world of activity, as in “the tortoise’s world” or “How are things in your world?” Here the word is qualified by “of”—the world of X. There are many such worlds, as many as there are creatures with lives and a “point of view”. But the other use is quite different: it refers to something called theworld—that world which encompasses everything. This is the philosophical use: “the world is the totality of facts” etc. It is not a world for anyone but something quite independent of a life, a consciousness, a point of view, a perspective. Can it be paraphrased? The nearest synonym appears to be “reality”, but that word too has its ambiguities. The OED gives us “existence that is absolute or objective and not subject to human decision or convention” (so decisions and conventions are not part of reality). Evidently, these words are hard to pin down in their philosophical use, though they have an intelligible ordinary use. It is difficult to avoid the impression that the philosophical use corresponds to something like “the scientist’s world” or “God’s world” (the world of an omniscient being). That is, the ordinary use has been recruited into a special sort of subject—the world-of use. For what else can it mean? There is not my world and your world and the tortoise’s world and then the world, as if the last is just another world in the ordinary sense except that a special sort of being is invoked. The idea is to prescind from any subject, but then the meaning of the phrase becomes obscure. It’s like speaking of a point of view from no point of view—there can be no such thing. Even the absolute conception is a conception by someone, even if only a possible being. When we hear the phrase “the world” we conjure a suitable being whose world it is, or else we don’t know whereof we speak. That is the suspicion anyway—we have strayed into nonsense, invented a pseudo concept. There is really no such thing as the world—there are only the worlds of this or that conscious being (or unconscious being—“the world of the worm”). We have appropriated a word in ordinary use and bent its meaning to express a philosophical concept—but that concept remains elusive. You know what Wittgenstein would say.

We evidently feel a need to express such a concept, but no word suggests itself. So, there is either no such concept or we are unable to express it in language (and we have no way to show it). The suspicion arises that there is no such thing as “the world” in the intended sense, whatever that may be. It is a philosopher’s fiction, or fantasy. There are the worlds of conscious beings, but no world in addition to these. What is called “the physical world” is really the world of the physicist. Of course, there are physical objects and properties, but not physical worlds as additional entities. Nor are there “possible worlds” in some sense independent of the worlds of people and animals; this is just so much illicit babble. Dare I say it: meaningless verbiage. There is the theater world and the fashion world and the academic world, but there are no worlds tout court. We have no concept of all there is that is somehow analogous to the concept we have of specific human and animal worlds. The putative idea of the world is not the idea of a kind of super-world in the ordinary sense—as it might be, God’s world or the world of a super-scientist. It is really an empty abstraction. Thus, the concept of the “noumenal world” is actually contradictory: for the intended referent is not supposed to be a world for anyone, even God. The phrase conjoins incompatible meanings, because what is noumenal cannot be a world in the only legitimate sense of that word. The world is not a world, if I may put it so. Perhaps the best we can do is speak of existence, but that is devoid of descriptive content; the word “world” was supposed to fill the conceptual gap, because we are familiar with the idea of worlds. I know what I mean by “my world”; well, theworld is like that except that I am deleted from the picture. But worlds are always someone’s world; it is a misuse of the word to suppose otherwise. There is always a plurality of worlds in the proper sense; the idea of a single all-inclusive world is a chimera. Nonsense on stilts, as someone once said. The phrase should be banned. It gives us a false sense of security.[1]

[1] We think we have brought an elusive (or meaningless) idea under control by using the word “world” in its usual sense, but this use is precisely not what is wanted. We fool ourselves if we think we have hold of an intelligible concept, rather in the way Hume and the positivists maintain, though for different reasons. Nonsense is not always transparent. The word “world”, as philosophers use it, is an “abstract idea” in Berkeley’s sense, and as such empty of descriptive content. It is like “the negative” or “the True” or “the most perfect being”.

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Future Trump

Future Trump

Trump’s law is this: it is always much worse than you think it will be. I am constantly surprised at how bad it keeps getting. With this in mind let’s contemplate the likely future unless things radically change. First, Trump withdraws support to Ukraine and the Russians take over the country. Unimaginable horrors ensue. Europe is destabilized. This happens soon. Second, Trump loses the trade war with China, which escalates tensions with military overtones. China decides to take Taiwan. Asia is destabilized. Third, millions of deportations occur causing great suffering and injustice, as well as enormous damage to the US economy, which is already reeling under tariffs. Fourth, the legal system is undermined, especially the Supreme Court; dictatorship is thereby hastened. Fifth, the universities are gutted, destroying science and intellectual life in general (more destruction to the economy). Sixth, media owners capitulate to Trump’s demands, thereby muzzling the press. Seventh, a worldwide recession occurs, with much social unrest. The possibility of nuclear war looms in the chaos and despair; Iran is the first country attacked. Eighth, television becomes bland and supine; comedians are not allowed. Ninth, there is an exodus of the most mobile people from the country, leaving it bereft of talent. Tenth, America becomes a police state. This nightmare scenario is already much more probable than it was 100 days ago—indeed, it seems inevitable unless something drastic happens and soon.

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Bodily Identity

Bodily Identity

Suppose you are interested in the nature of bodily survival: under what conditions does a body survive into the future? Your initial theory is that identity through time is a necessary and sufficient condition: the body then must be numerically identical to the body now. This is generally how it is and you conjecture this is how it must be: for example, a cat’s body will only survive if some future body is identical to that body; if no future body is identical to the given body, it will not count as that body surviving into the future. But now you notice a curious fact: some bodies can be bisected and the parts go on living. Some organisms divide, or can be divided, in two and the results survive into the future. Is there an identity between the original body and the surviving results of bisection? No, because neither of the two bodies is identical to the original body, since they are not identical to each other; and they can’t be identical to the original as a composite because the composite consists of different functional bodies and the original was not such a pair (the two bodies have grown extra limbs where none existed before). Yet we would want to say that the original survives the operation—bisection isn’t the same as death by obliteration. That is, in fission cases we have survival without identity. Fission is a better fate than death, if you care about bodily survival. It seems, then, that your initial theory of bodily survival was wrong: survival of the body does not logically require identity through time.

It has been claimed that survival of the person follows the same logic: a person can survive an operation in which no future person is identical to the original. These are brain bisection cases: you cut the brain into two and place the halves in two bodies, thus producing two persons not identical with any past person. Personal survival does not require personal identity, as these fission cases show. The human brain is made of two hemispheres each capable of housing a person if bisection is performed. The person can be divided from himself, as it were, as the body can be divided from itself. The anatomy of the brain makes that possible, as the anatomy of our hypothetical organism makes a similar thing possible. What metaphysical conclusions can we draw from such fission cases? What we cannot conclude is that persons are distinctively capable of survival without identity. We cannot say that it is a defining property of persons that they are able to survive without identity holding between them and some future person. It isn’t as if persons differ from bodies in this respect. It just turns out that in viable bisection cases we get survival without identity, whether it is persons or bodies that are at issue. We have made no such discovery about persons and only persons. So, we have not laid the groundwork for the further conclusion that personal survival consists of psychological continuity and connectedness as opposed to simple identity—unlike other classes of entity. In fact, the cases are precisely parallel: there is nothing particularly tenuous and degree-like about the survival of persons over time, as a matter of metaphysical necessity. It isn’t that personal survival is uniquely non-identity-requiring. In fact, this is a quite banal truth about survival in general—a matter of simple logic and the possibility of dividing things into two. It isn’t that persons possess the remarkable property, alone in the universe, of being capable of surviving in the absence of identity.

Let’s add another thought experiment: consider a possible world in which brains are not divisible in the way they are in the actual world—if you cut them in two, both halves die on the instant. Then there will be no possible fission cases in that world: there cannot be survival without identity of persons in that world. And yet there may still be fission cases for bodies in this world. Then we will have survival without identity for bodies but no survival without identity for persons. We invert the usual thought experiment. Teachers of philosophy in this world will be able to provide convincing thought experiments of the former type (bodies) but not the latter type (persons). Students will be persuaded that bodies can survive in the absence of identity, but not that persons can. If the latter is suggested, they will retort that such a thing is impossible, because brains cannot be divided without causing death. Bodies can, though, as illustrated by the organisms that do survive under fission; but persons can’t, because brains can’t survive under fission. It will be possible to write books about bodies drawing attention to their loose survival conditions, but not write such books about persons—they can survive only under conditions of strict identity.

Is it, then, that the correct theory of personal survival depends on the kind of world you are living in? If you are living in a world in which brains are like current human brains, then the non-identity continuity-and-connectedness theory holds; but if you are living in a world in which brains are not like this, then the simple identity theory holds. That would mean that there is no metaphysical truth about persons as such—only a kind of relative truth. It is only human persons (or those anatomically like them) that allow survival without identity, and hence invite a continuity-and-connectedness theory of personal survival; other species might not permit of the kind of operation envisaged by defenders of that theory. Indeed, it might be that the universe contains many species of persons all but one of which cannot survive without identity. This is not what proponents of the non-identity theory of survival had in mind—they purported to speak of the nature of persons not of some specific biological type of person. You can’t make metaphysics out of biological contingency.[1]

[1] I am alluding, of course, to the influential views of Derek Parfit.

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