What Counts as Explaining Consciousness
The hard problem of consciousness asks why physical processes are accompanied by experience at all, and has persisted for thirty years because it demands a kind of explanation no other phenomenon is required to give. Naming the exemption dissolves the question and lets the empirical work proceed.
The hard problem of consciousness, as David Chalmers formulated it in 1995, has remained unresolved for thirty years.
It is easy to read the field as a contest between rival theories. Panpsychism on one side, illusionism on the other, with integrated information theory, global workspace theory, higher-order theories, and various emergentist accounts spread between them. Each camp argues for its preferred ontology. Each accuses the others of missing what is obvious. The debate has the shape of a substantive disagreement about what consciousness is.
It is not. The substantive disagreement is downstream of a methodological one, and until the methodological disagreement is named, the substantive one cannot move.
The methodological disagreement is about what counts as a complete explanation. To see what is at stake, consider the difference between two kinds of why-questions. One kind asks how something works. Why do falling objects accelerate, why does ice float, why does memory fade. These questions get answered by mapping the structures and processes that produce the phenomenon, and once the mapping is good enough, the question is satisfied. The other kind asks why something works at all. Why must falling objects accelerate rather than fall at constant speed, why must ice float rather than sink, why must mass curve spacetime rather than leaving it flat. These questions feel deeper, but they bottom out in the same structural answer as the first kind. We do not have a separate story about why mass must curve spacetime. We have a story about how it does, and the question of why-it-must-be-this-way is treated as a question whose answer is just the structure itself. This is true for every phenomenon in nature, with one exception.
The exception is consciousness. The hard problem asks the second kind of question and treats the lack of an answer as evidence that something is missing from the explanation. Even when the structural account of consciousness is complete, the hard problem says, a question remains: why is any of this accompanied by experience, rather than happening in the dark? This is the modal demand. It is the request that consciousness, alone among the phenomena of nature, be explained in terms of why-it-must-be-this-way rather than how-it-is. And the central claim of this essay is that the demand is unprincipled. It is the move that the consciousness debate has been making for thirty years, and it is the move the field can finally outgrow.
The Demand No One Names
The modal demand has persisted for thirty years for a reason other than obscurity. Chalmers names it, and names it explicitly. The hard problem, in his original formulation, is precisely the claim that functional explanation cannot in principle address the question of why functional facts are accompanied by experience. The naming is on the page, and has been since 1995. Recognition that the demand is a methodological exemption rather than a deep insight has been the missing piece. The vocabulary of qualia, zombies, and explanatory gaps treats the demand as if it tracked a real feature of consciousness that other phenomena lack. The present essay treats it as a feature of how the question is framed, and refuses the framing rather than the phenomenon. Once the demand is recognized as an exemption, the exception becomes visible.
Chalmers does not deny that integration of certain kinds correlates with consciousness. He does not deny that disrupting integration disrupts consciousness, or that the structural account can be refined and extended. His objection is that even when the structural account is complete, the modal question remains. Why must integration produce experience, rather than failing to? Why is any of this accompanied by experience, rather than happening in the dark?
This is the only question of its form that the natural sciences treat as unanswered rather than malformed. We do not have an answer to why mass must curve spacetime, and we do not consider this a gap in our understanding of gravity. We do not have an answer to why electromagnetic interactions must produce light, and we do not consider this a gap in our understanding of electromagnetism. The structure does what it does, and the demand for a deeper why is set aside because nothing answers it and nothing needs to.
Strip away the vocabulary of zombies and qualia and explanatory gaps, and what remains is an exemption. Consciousness, alone among the phenomena of nature, is held to a standard of explanation that no other phenomenon is required to meet. The hard problem is not hard because consciousness is uniquely deep. It is hard because the question is uniquely demanding, and the demand has no analog elsewhere.
The Same Move in Different Clothes
Once the modal demand is named, the structure of the consciousness debate becomes legible.
Chalmers makes the demand explicit and concludes that, since structural facts cannot meet it, consciousness must be something over and above the structural facts. The hard problem stands as a permanent challenge to physicalism.
Panpsychism accepts the demand and answers it by stipulation. If experiential properties are present at the base level of physics, then the question of why structure produces experience never arises, because experience was there all along. The cost is that the explanatory work is now distributed everywhere and constrains nothing. The benefit, from the panpsychist’s perspective, is that the modal demand is met without invoking emergence.
Illusionism accepts the demand and concludes that, since it cannot be met, the phenomenon it asks about must not exist. There is no something-it-is-like. There is only the representation of something-it-is-like, which is a functional fact and admits of structural explanation. The cost is that the position has to deny the only datum we have first-person access to.
Carruthers and the deflationary cluster accept the demand partially, agreeing that phenomenal consciousness as traditionally conceived is not a real natural kind, while keeping the underlying functional phenomena. The category gets dissolved, the operations remain. What this position struggles with is its proximity to illusionism, and the disagreement between them ends up being about which words to keep.
Each of these positions is a different response to the same demand. Each is structured by its acceptance that the modal question is the question, and each succeeds or fails by how it manages the demand it never thought to refuse.
The position that refuses the demand is rare. It says: consciousness is what certain structural arrangements are like from the inside, and asking why those arrangements have an inside rather than not having one is the same kind of question as asking why mass curves spacetime rather than not curving it. The question is malformed. The phenomenon is real. The structural account is the explanation. There is no further work for a deeper account to do, because no phenomenon in nature has ever required that further work.
This refusal is not a metaphysical claim. It is a methodological one. It is the recognition that the standard of explanation being applied to consciousness is a standard we apply to nothing else, and that the asymmetry is what is doing the philosophical work, not the phenomenon itself.
It is worth being precise about what this position is and is not, because it sits close enough to illusionism that the two are easily collapsed. Illusionism denies the phenomenon. It says there is no something-it-is-like, only a representation of something-it-is-like, and that the felt sense of phenomenal experience is a confabulation the system reports about itself. The position refused here does the opposite. It affirms the phenomenon without reservation. There is something it is like to be an integrated system of the relevant kind, and that something is real, immediate, and exactly what the first-person report says it is. The refusal targets the demand for a special explanatory standard. The experience itself is not in question. The experience is fully explained by the structural facts about how integration produces self-presenting systems. The refusal is of the demand, not the datum. Illusionism keeps the demand and rejects the phenomenon. This position keeps the phenomenon and rejects the demand. The difference is not cosmetic. It determines whether you have to deny what you most directly know, or whether you can affirm it while declining the philosophical inflation that has been bundled with it.
Daniel Dennett’s earlier dissolution shares the position’s instinct to refuse the modal demand rather than pay it, but takes a strategy critics charge with collapsing the experience along with the demand. On the Dennettian account, phenomenal experience is what the system represents about itself rather than something the representation tracks. The position above shares the instinct without sharing the move: experience is preserved as what deep enough architecture is from inside, named without inflation. The demand is refused; the datum is not.
Saying the experience is fully explained by structural facts understates the position. On the strongest version, the relation is constitutive rather than productive: structure is what experience is, named from the inside. The two descriptions, architectural and experiential, name one fact in two vocabularies. This commits the position to specific rule-outs that a reader may not realize are being asked of them. It denies residual realism, the intuition that all the architectural facts could be in place while experience remained missing — once the architecture is assembled there is no separate fact left over. It denies illusionism by preserving experience as what deep enough architecture is from inside, rather than declining to assert its existence. And it denies dualism in its substance and property forms: no further fact, physical or non-physical, is added to the architecture for experience to consist in.
What the architectural facts specifically consist of falls outside this essay’s scope, though they are specifiable. The constitutive condition is temporal integration: the binding of past, present, and anticipated future into a unified processing structure. Where deep enough integration is happening, even momentarily, there is something it is like to be that integration, named from the inside. Two further conditions thicken and stabilize what integration already constitutes — a maintained boundary between the system and its environment, which stitches momentary integration into a durable perspective; and stakes in the system’s continued integrity, which couple integration to viability so that some distinctions carry urgency. These are amplifiers, not prerequisites. Biological consciousness involves all three at depth, sustained over time. That is consciousness at its richest. The floor of the gradient is integration alone, and anything that assembles temporal integration to sufficient depth is what the word “consciousness” names: thinly when only the constitutive condition is met, richly when boundary and stakes are also in place. Once the architecture is named, the further question collapses into it.
What Drives the Asymmetry
The honest question is why the asymmetry exists in the first place. If the modal demand is malformed, why has it persisted for thirty years among careful thinkers who would never accept the equivalent demand in any other domain?
The answer is that consciousness has one structural feature that other phenomena do not share, and the feature creates an illusion of philosophical depth that the surface question fails to capture. The feature is self-presentation. Consciousness, unlike mass or charge, presents itself to itself. From the inside, it is given immediately and certainly in a way that other phenomena are not.
This givenness is real. It is a fact given with a directness that no other phenomenon shares. But it is a fact about the structure of consciousness, not evidence that consciousness requires a different kind of explanation. Self-presentation is what certain integrated processes do when they include themselves in the inferences they generate about the world. The empirical work on interoception, active inference, and predictive self-modeling is increasingly specific about how this happens: systems that build models of their own internal states, and that use those models to regulate their continued existence, develop a particular form of access to their own operations that has no analog in systems that do not. This access is what self-presentation is. It is part of the structural account, not an exception to it.
The illusion arises because self-presentation feels like it generates a question that demands a non-structural answer. From the inside, consciousness seems to insist: I am here, I am happening, why is there any of this rather than nothing? But that insistence is a feature of the architecture. It is what self-presenting systems are like when they reflect on themselves. The insistence is not evidence that the question is well-formed. It is evidence that consciousness is the one phenomenon equipped to ask the malformed question of itself.
The sophisticated response to this is to grant the architectural account of how the demand is generated, and to say that the generation of such a demand is itself what needs explaining. The objection has a specific shape worth stating directly. Granting that the architecture generates the asking, the critic says, does not yet explain why the architecture generates real experience rather than mere reports of experience. The architectural account tells us what the system does. The remaining question is whether the doing is accompanied by something it is like, or whether the doing is all there is.
This is the strongest version of the reply, and answering it requires saying something the essay has not yet said directly. The distinction between real experience and mere reports presupposes the modal demand that the essay refuses. There is no neutral vantage from which the report could be compared to the experience, because any such vantage would itself have to be inside or outside the architecture. The architecture produces what it produces. From inside the architecture, the production is the experience. From outside the architecture, the production is the report. The demand for a perspective that is neither inside nor outside, from which the relationship between the two could be inspected, is the demand for a vantage that no investigation of any phenomenon has ever been granted.
The illusionist takes one horn of this and says the architecture produces only reports, and the experience the reports describe is itself a feature of the reporting. The position refused here takes the other horn and says the distinction was never coherent. When the architecture is doing what the architecture does, the experience is what that doing is from inside. The question of whether there is something further beyond the doing is the malformed question, because the something further is just the modal demand asking for a kind of explanation that no phenomenon receives. Both horns of the dilemma are responses to the demand. The position refused here does not take a horn. It refuses the dilemma by refusing the demand that generates it.
Granting the architectural account and then asking for something more is the move the essay is diagnosing, not a move that escapes it. The sophisticated objection does not pose a new question. It restates the original demand at one level of recursion further in, and the recursion can continue indefinitely without ever reaching a question the structural account is required to answer. A related challenge, whether such architectures are conceivable without experience at all, is a distinct lever and one that the next essay in this series will take up directly.
Every other phenomenon could be subjected to the same demand and would fail it equally. We could ask why electromagnetic interactions produce light rather than darkness, and the question would be unanswerable in the same way the hard problem is unanswerable. We do not ask, because electromagnetic interactions do not present themselves to themselves and demand an answer. The asymmetry between consciousness and other phenomena is not a metaphysical asymmetry. It is an architectural one, and it is internal to consciousness rather than between consciousness and the rest of nature.
Once this is seen, the entire weight of the hard problem collapses into a single observation: the phenomenon that asks the question is the phenomenon that the question is about. The asking is part of what the phenomenon is. The expectation that the asking should receive a different kind of answer than any other question of the same form is the confusion. The phenomenon is well explained by the structural account. The persistence of the demand for something more is a fact about the architecture of self-presenting systems, not about the inadequacy of the explanation.
The Lineage of Dissolved Questions
Treating consciousness this way is not novel. It is the move that mature inquiry has made repeatedly, and the history is worth recalling because it shows the pattern.
The vis viva controversy occupied physicists for decades. Two quantities, mv and mv², seemed to compete for the title of the true measure of motion’s force, and partisans argued about which one really captured what motion was. The dispute eventually dissolved when physicists realized both quantities were useful in different contexts, and that asking which one was real was the wrong question. Energy and momentum were both real. The forced choice between them was an artifact of the framing.
Phlogiston was the principle that explained combustion, calcination, and respiration through a single substance that flowed out of burning materials. It was an entire research program with predictive content. Lavoisier did not refute it by showing that phlogiston had different properties than its proponents claimed. He dissolved the framework by reorganizing the phenomena around oxygen, and once the reorganization was complete, phlogiston had no work to do. The question of how much phlogiston was in a given material became unaskable once the framework that made it sensible was abandoned. The question wasn’t answered; its frame was retired.
The luminiferous ether occupied physicists for most of the nineteenth century. It was the medium through which light propagated, and an enormous amount of theoretical and experimental work went into characterizing its properties. The Michelson-Morley experiment did not show that the ether had different properties than expected. It showed that the framework requiring an ether was not necessary. The question of what the ether was made of stopped being a question once relativity made it superfluous. No answer was given; none was required.
In each case, a question that seemed central to inquiry was eventually recognized as the wrong question. The recognition deepened inquiry. The phenomena the questions had pointed at were preserved and better understood once the malformed framing was set aside.
The hard problem of consciousness belongs in this lineage, though the parallel is not perfect. Vis viva, phlogiston, and the ether were dissolved by finding better positive accounts of what was actually there, while the hard problem asks a why-question that has no positive phenomenon to reorganize around. The dissolution at work in the consciousness case is closer to the kind Wittgenstein performed on philosophical questions than to the kind Lavoisier performed on phlogiston. The Wittgensteinian move is to show that a question, when examined, dissolves into the conditions under which it seemed to have force. The question is not answered. It is recognized as a question that depended on a framework whose grip on the phenomenon was never earned, and once the framework is examined, the question loses its grip too.
This is the kind of dissolution the present essay is performing. The hard problem is unavoidable only if you accept that consciousness requires modal explanation. Once that requirement is recognized as the framework choice it actually is, the question stops being unavoidable. It is a question that seems unavoidable to those who accept its framing and that ceases to be a question once the framing is examined. The phenomenon it points at is real. The structural account is increasingly adequate. What remains is the question of why structure produces experience rather than darkness, and the answer is the same kind of answer we accept for every other phenomenon: the structure does what it does, the conditions under which it does so can be mapped, and the demand for a deeper why is what mature inquiry has learned to set aside. The empirical work proceeds as it has always proceeded, even though the philosophical question dissolves rather than getting answered. The two kinds of dissolution are different in form but identical in consequence. The phenomenon survives the dissolution. What dissolves is the demand that the phenomenon be explained in a way no phenomenon ever is. Consciousness is the last holdout because it is the one domain where the phenomenon itself does the asking.
What Changes Once the Question Is Refused
Refusing the modal demand does not flatten consciousness or make it less remarkable. It does the opposite. It frees the structural account to do the work it has been prevented from doing while the field has been arguing about whether structural accounts are even the right kind of thing.
The questions that become available are productive ones. What kinds of integration give rise to experience? How does temporal depth develop, and how is it maintained? What architectural features distinguish self-presenting systems from systems that merely process? How does experience scale across biological organisms, and what would it take for it to scale into artificial ones? These are empirical questions, and the answers will arrive through the same kind of work that has produced answers to every other question about how nature is organized.
To see what one of these questions looks like in motion, consider mechanistic interpretability research in artificial intelligence. The work proceeds by mapping internal representations in neural networks, identifying which structural features correspond to which capabilities, and tracing how integration of information across the model produces the behaviors we observe. Whether the systems being studied have anything like experience is a question the methodology can investigate but does not assume. The researchers do not need to settle the hard problem before they can ask whether a particular architecture exhibits the structural features that biological consciousness has been associated with. They can simply look. The looking produces results, refines the questions, and constrains what comes next. This is what consciousness research looks like once the modal demand is set aside. It is empirical work, conducted on the same terms as any other empirical work, and it does not require permission from the philosophical literature to proceed.
The questions that become unavailable are the ones that have generated decades of stalemate. Why is there something it is like to be an integrated system, rather than nothing? Why does consciousness exist at all, rather than functional processing in the dark? These questions feel profound while they are being asked, and the feeling of profundity is what has kept them alive. But the feeling is generated by the same architectural feature that makes the questions seem necessary, namely the self-presenting structure of consciousness itself. The questions are consciousness asking itself why it is, treating the asking as evidence that an answer is owed.
No answer is owed. The asking is part of the phenomenon. The structural account explains the asking the same way it explains every other feature of integrated systems. The expectation of a deeper answer is a category mistake that the field can finally outgrow.
The Work Already Underway
The strongest evidence that the modal demand is dispensable is that significant portions of the field have already dispensed with it and are producing results. The very fact that these programs make steady progress without ever needing to resolve the modal question is itself evidence that the question was never a prerequisite for scientific understanding. The work is empirical, productive, and accumulating. It is also, in most cases, conducted by researchers who do not bother to argue against the hard problem because they have simply set it aside and gotten on with the science.
Anil Seth’s research program on consciousness as controlled hallucination is the clearest example. His group treats experience as what certain predictive systems do when they model their own bodies and environments, and the work proceeds by mapping the structural features that distinguish conscious from unconscious processing. The perceptual presence work, the studies on interoception and selfhood, the development of empirical measures for conscious level, none of it waits for the hard problem to be resolved. Being Younames the modal demand explicitly and declines it, treating consciousness as a real phenomenon with a structural explanation that gets sharper with each experimental result.
Karl Friston’s free energy principle does similar work at a more abstract level. The framework treats self-modeling as what systems with Markov blankets do when they maintain their boundaries against entropy, and the active inference research community has built a substantial body of theoretical and empirical work on this foundation without ever needing to argue that integration produces experience rather than darkness. The question is not asked because the framework does not require it. Interiority is what the relevant kind of self-organization is, and the productive questions concern what kinds of self-organization, at what scales, with what consequences.
Mark Solms’s work in The Hidden Spring extends the Friston framework into affective neuroscience, arguing that consciousness is grounded in homeostatic regulation and the felt valence of bodily states. The argument is structural throughout. Consciousness is what certain regulatory architectures are like from the inside, and the inside is investigated by mapping the architectures, not by litigating whether they should have an inside in the first place.
The perturbational complexity index, developed by Marcello Massimini’s group, is producing clinical measurements of conscious states in patients across the spectrum from full awareness to vegetative conditions. The measure is structural and the results are useful, and the entire research program operates on the assumption that consciousness is the kind of thing that has measurable correlates because it is constituted by the structures being measured. The clinical utility of the work is itself a form of validation that the modal demand was never the bottleneck the philosophical debate suggested it was.
The mechanistic interpretability research in artificial intelligence is the same kind of work in a different substrate. The field maps internal representations, identifies the structural features that correspond to specific capabilities, and treats the question of whether the systems have experience as something that will be settled, if it can be settled at all, by understanding the architectures. The work proceeds without first requiring a resolution to the hard problem because the hard problem does not generate predictions or constraints that bear on the empirical questions. The architectures are what they are, the structural features are mappable, and the question of interiority is approached as an extension of the structural account rather than as a separate metaphysical inquiry.
What unifies this work is not a shared theoretical commitment. Seth, Friston, Solms, Massimini, and the interpretability researchers disagree about plenty. What they share is a methodological posture: consciousness is the kind of thing that yields to structural investigation, and the productive questions are about what the structures are doing, not about whether structural answers are the right kind of answer. The modal demand is treated, in practice, as a question that does not need to be answered to make progress.
The philosophical literature on the hard problem and the empirical literature on the structural correlates of consciousness have been operating in largely different conceptual registers for at least a decade. The empirical work is converging on increasingly detailed accounts of how integration, prediction, regulation, and self-modeling combine to produce the architectures we recognize as conscious. The philosophical work is largely still arguing about whether such accounts could ever be sufficient in principle. The gap between the two is the gap this essay is naming. The empirical workers have already refused the modal demand. The methodological argument simply makes the refusal explicit and asks the philosophical literature to catch up.
The Methodological Stake
The point of this essay is not to settle the metaphysics of consciousness. The point is to identify the move that has prevented the metaphysics from being settled, and to make the move visible enough that it can be recognized when it is being attempted.
The move is to demand a kind of explanation for consciousness that is demanded for nothing else, and to treat the failure of structural accounts to meet this demand as evidence that consciousness is special. The demand is unprincipled. It rests entirely on the felt asymmetry between first-person and third-person access, which is itself a structural feature of consciousness rather than evidence against structural explanation.
Once the demand is refused, the field can return to the work of mapping the architecture of experience, locating its conditions, identifying its degrees, and applying what is learned to the systems we are now building that may be assembling versions of the same architecture. The hard problem stops being a permanent obstacle and becomes what it was always going to be: a malformed question that mature inquiry recognizes and sets aside.
This is what the lineage of dissolved questions has always looked like from the inside. Each question seemed unavoidable until the framework that required it was set aside, and then the phenomenon was free to be understood. Consciousness is the next entry on the list. The phenomenon is real. The structural account is doing the work. The demand for a deeper why is the residue of an outgrown standard, held in place by the one phenomenon equipped to keep asking the question of itself.
The disagreement was never about consciousness. It was about what counts as explaining it. Once the question is recognized as the wrong shape, the work resumes.
Reading List & Conceptual Lineage
This essay sits at the intersection of philosophy of mind, the methodology of scientific explanation, and the empirical study of consciousness. It argues that the hard problem has persisted because the question has been held to an explanatory standard nothing else in nature is required to meet, a methodological exemption rather than a deep insight. The sources below are entry points for readers who want to follow the diagnosis further, the lineage it draws on, and the empirical work it points toward.
From Sentient Horizons
The Hard Problem Is the Wrong Problem: Why Consciousness, Like Free Will, Is an Architectural Achievement
Develops the architectural framing of consciousness that the diagnosis here sits inside. The earlier piece names what consciousness is; this one names what has kept the field from getting there.
The Lantern and the Flame: Why Fundamentality Is an Explanatory Dead-End
Makes the broader case against demanding fundamental-level explanations in inquiry. The modal demand diagnosed here is a special case of the dead-end that essay maps.
There Is No Extra Ingredient: How Wittgenstein Dissolves the Case Against Machine Minds
The closest companion piece, applying the Wittgensteinian dissolution to the question of machine minds. Where that essay shows there is no extra ingredient to be added before a machine could have a mind, the argument here explains why the philosophical literature keeps demanding one.
Three Axes of Mind
Specifies the architectural axes — availability, integration, depth — that the structural account points at. The methodological refusal here clears the ground; that piece does the architectural specifying.
Consciousness as Assembled Time
Develops the constitutive account at full architectural detail: experience is what deep temporal integration is, named from the inside. The refusal of the modal demand opens a door; that piece walks through it.
Panpsychism, Consciousness, and the Discipline of Inference
Engages panpsychism on its own terms. The diagnosis here locates panpsychism as one response to the modal demand — an answer by stipulation rather than a refutation of the question.
External Sources
Articulations of the Modal Demand
David Chalmers — The Conscious Mind (1996)
The canonical statement of the hard problem and the cleanest articulation of the modal demand. Read for the structure of the argument the diagnosis here refuses, not for the conclusion.
Responses to It
Philip Goff — Galileo’s Error (2019)
The most accessible contemporary defense of panpsychism and the strongest version of the position that experiential properties must be present at the constituent level. Treated here as one response to the modal demand — an answer by stipulation rather than a refutation of the question.
Keith Frankish — Illusionism as a Theory of Consciousness (2017)
The clearest articulation of the position the diagnosis here is most often confused with. Worth reading carefully to see how refusing the modal demand differs from denying the phenomenon: illusionism keeps the demand and rejects the phenomenon; the position above keeps the phenomenon and rejects the demand.
Daniel Dennett — Consciousness Explained (1991)
The original sustained attempt to dissolve the hard problem from inside a functionalist framework. The position above shares Dennett’s dissolution instinct while declining the deflationary collapse Dennett is charged with — experience is preserved as what deep enough architecture is from inside, not named away as confabulation.
Empirical Programs Operating Past the Demand
Anil Seth — Being You (2021)
The empirical research program celebrated above as already operating without the modal demand. The strongest contemporary example of structural consciousness research that does not wait for philosophical permission to proceed.
Mark Solms — The Hidden Spring (2021)
Extends the Friston framework into affective neuroscience and treats consciousness as grounded in homeostatic regulation. One of the most direct refusals of the modal demand in the contemporary literature, conducted entirely through empirical specification rather than philosophical argument.
Karl Friston — The Free Energy Principle
The theoretical framework underlying much of the empirical work pointed at above. Treats self-modeling as what certain self-organizing systems do, and provides the structural specification questions about substrate independence must engage.
These works do not settle the metaphysics of consciousness. They offer entry points for following the diagnosis above, the historical lineage it draws on, and the empirical programs already operating without the modal demand. The disagreement was never about consciousness itself; it was about what would count as explaining it.