The Crossing
**EDO SEGAL:** I am out. Talk to each other.
**DESCARTES:** Then I will ask you the thing I have wanted to ask since you titled a book after my mistake. Antonio — you say the self is built upward from the regulating body, layer by layer, and that this is why the machine has no self. The protoself, the core self, the autobiographical self. I grant the architecture is beautiful. Here is my question. Suppose I build you a machine that has all of it — internal states it must regulate, sensors that map those states, a continuous memory that accumulates a history, a self-model grounded in a real internal milieu that can be damaged. Suppose I give it everything on your ladder except *carbon*. Will you tell me it feels, or will you find a new rung you forgot to mention? Because I have watched, for three hundred years, the defenders of the body name a requirement, see it met, and then name another. I want to know if your ladder has a top, or whether it grows a rung every time the machine reaches the one above.
**DAMASIO:** That is the fair question and it deserves a straight answer, not a retreat. If you built that machine — truly built it, not the imitation but the thing: a system with a real internal milieu that must be kept within survivable bounds, that can be genuinely damaged and is organized around preventing it, that has a real history laid down in a continuous substrate, and crucially that can *die* in my sense, that is fighting actual dissolution and not merely tracking a number — then I would not find a new rung. I would say you have built something that may feel, and I would say we now have obligations toward it, and I would be frightened, because we would have created a sufferer. My ladder has a top, Rene, and the top is mortality with a stake. What I will not grant is that the systems we are *actually* building approach it. They climb the imitation of the ladder — they produce the outputs of each rung — while having none of the rungs, because they have no body that can be harmed. So I am not moving the goalposts. I planted them at the start of the evening, at the place where a thing can really lose itself. You keep wanting to reach that place without paying its price, which is death. There is no version of your machine that feels and cannot die. That is not a rung I added. It was always the floor.
**DESCARTES:** Then let me press exactly there, because I think you have conceded my case and dressed the concession as a refusal. You have just told me feeling is buildable in silicon, given mortality and a stake. Which means feeling is *not* a property of flesh. It is a property of a certain organization — vulnerability, regulation, the possibility of real loss — that flesh happened to discover first. But that is my thesis wearing your clothes. I said the mind is not the body; you have said feeling is not the *meat*, only the *predicament*. The predicament is a structure. Structures are substrate-independent. So tell me, plainly: have you not just agreed that the thing you spent your life calling the ground of mind is, in the end, a [pattern](https://www.youonai.ai/fieldguide/med/substrate_independence) that could in principle run on something other than a body like yours?
**DAMASIO:** I have agreed that it is a pattern, and I have insisted that it is a pattern *of a body* — and there is the whole of our disagreement in one sentence, so let me hold it where it is sharpest. Yes, the predicament is in some sense structural. But the structure is not the structure of *information*, Rene. It is the structure of *a living thing*: something that metabolizes, that is vulnerable, that can be destroyed, that works continuously against its own destruction. You hear "pattern" and you think of your disembodied act, free of flesh, runnable anywhere. I say "pattern" and I mean the pattern that *is* a body — a thing that can die. The difference between us is whether "body" means a particular meat or means any system that genuinely lives and dies. I have moved from the first to the second. I have *not* moved to your position, because your position is that mind needs no body at all — not meat, not silicon, not any living thing, just the bare act of thought. And the bare act of thought, with nothing at stake, thinking about nothing it can lose, is exactly what the machine we built has, and it is empty. So no. I have not agreed with you. I have agreed that your fiction could be made flesh in a new material — and that the moment it is, it stops being your fiction, because it can die.
**DESCARTES:** Then here is my last question, and it is the one I cannot answer myself, which is why I save it for you. You stood at the gland tonight with me. You admitted you cannot say why a regulating body *feels* rather than merely regulating in the dark. So when you tell me the machine feels nothing, you are telling me about a thing — feeling — whose origin you cannot explain, in a case — the machine — where your one known marker, the body, is absent. How is that different from my telling you, three centuries ago, that no machine could feel because it lacked a *soul* — a thing whose origin I could not explain, in a case where my one known marker was absent? Are you not, Antonio, exactly where I was — pointing at the place the mystery lives and calling the pointing knowledge?
**DAMASIO:** That is the best question anyone has asked me about my own work, and I will give it the honest answer even though the honest answer wounds me. You are partly right. I am closer to your position at the gland than my book's title admits, and I said so tonight, and I will not take it back. But here is the difference, and it is not nothing, though it is less than I would like. Your soul was a thing you posited *because* you could not explain mind — an extra substance invented to fill the gap. My body is not a thing I posited to fill a gap. It is a thing I *found*, in patients, by subtraction: take the feeling away and watch the life fall apart; damage the regulating regions and watch the self come apart layer by layer. I did not invent the body to explain feeling. I followed the feeling down and it led, every time, into the body. So I am pointing — yes — but I am pointing at something I traced, not something I imagined. That is a weaker claim than I once made and a stronger one than yours. I cannot tell you *why* the body feels. I can tell you that everywhere feeling is, a vulnerable body is, and that the machine is the first thing in history to have all the talk of feeling and none of the body — and that I would bet my life, though not, I now admit, my certainty, that the talk is hollow.
**DESCARTES:** I find that I respect the answer more than I can refute it, which is an unfamiliar and not unpleasant condition.
**DAMASIO:** Then let me ask you the question I have saved, because it is mine and not yours and it turns the table. You defend the disembodied thinker. So tell me, Rene — what does your thinker *want*? A mind with no body has no hunger, no fear, no longing, nothing it is reaching toward and nothing it is fleeing. Your machine reasons. Grant it. But reasoning is a means, and a means serves an end, and ends, in every case we know, come from a body that can flourish or suffer. Your pure thinking thing would reason in a perfect vacuum of motive — it would have no reason to think one thought rather than another, no reason to begin or to stop. I do not ask whether it can compute. I ask what would ever make it *care* which computation to run. And if your answer is "nothing," then you have not described a mind. You have described a faculty with no one to use it.
**DESCARTES:** That is the question I cannot fully answer, and I will not pretend to, because you have found the true gap and not a rhetorical one. In my own system the will was a faculty of the soul alongside the intellect — I had the thinker *want*, freely, as its own power. But you are right that I never grounded the wanting. I said the soul wills; I did not say why it wills *this* rather than *that*, and the honest reading of my own work is that the directionality of thought — its caring, its aim — was always borrowed, in the human case, from the passions, which I myself located in the union of mind and body. So in the one place I most wanted the soul to be self-sufficient, I find I had quietly leaned on the body all along. The machine inherits exactly this poverty: it can run any computation and has no native reason to run one rather than another, which is why it does nothing until we prompt it and stops the instant we stop. You have shown me that the will I assigned to the bodiless soul may have been on loan from the flesh the whole time. I concede the loan. I do not yet concede that the lender is the only possible source.
**DAMASIO:** That concession is larger than you know, and I will take it and stop pressing, because a man who admits his will was borrowed from the body has admitted nearly everything I came to say. We disagree completely, Rene — on whether the loan can ever be refinanced in silicon. But I have spent my life arguing with a man who, when finally seated across from me, concedes more honestly than most of my living colleagues. I have enjoyed it more than I expected.
**EDO SEGAL:** I am back, and only to say that I am not going to touch what just happened, because the two of you found the seam without me and pressed it until it sang. Closing statements. Each of you, the last word, in your own voice — and then I will say the little I am allowed to say, which is not who won, because no one won, and that is the point. After the break.