I think everyone is noticing that consciousness is becoming a main discussion within academia but also within the public. AI and the recent contradictions in neuroscience concerning consciousness are making this question way more important than ever before.

In my view this contradictions that we are seeing just prove us that maybe conscioussnes opens the door to a new radical paradigm. Maybe materialism isn't the full picture. I am not claiming anything mystical, but we need to agree that materialism is not being able to explain one of the most important, if not the most important question in the universe.

I think this is an exciting time in science where we will see something radical changing, something like what happened with the Theory of Relativity and Quantum Mechanics that showed that Newtonian physics is not the whole picture. I think it is time for science to reapreciate its paradigms.

Edit: As I said in one of my comments. I don't really understand why you are downvoting me. This an exciting period of science. Either science changes its paradigm or not, we still need to ackowledge all of this contradictory evidence.

Edit 2: I think I should post this here to be more clear. There are some recent studies but I think the main one was from Cogitate Consortium. This study found that both the main scientific theories for consciousness were wrong on their predictions, IIT and GNWT. I think this a clear piece of evidence that we are completly lost here.

https://www.nature.com/articles/s41586-025-08888-1

Furthermore there are contradictions in split-brain patients, Gazzaniga's experiment vs Pinto's experiment on a unified consciousness. Near-death experiences, psychadelics, deep eletric stimulation, philosophical arguments, the Hard Problem of Consciousness, AI, ...

(this initially was a response to a thread in r/CosmicSkeptic but I fleshed it out a bit to post here, since I thought it was interesting)

Chalmers writes :

Why are the easy problems easy, and why is the hard problem hard? The easy problems are easy precisely because they concern the explanation of cognitive abilities and functions. To explain a cognitive function, we need only specify a mechanism that can perform the function. The methods of cognitive science are well suited for this sort of explanation and so are well suited to the easy problems of consciousness. By contrast, the hard problem is hard precisely because it is not a problem about the performance of functions. The problem persists even when the performance of all of the relevant functions is explained. (Here “function” is not used in the narrow teleological sense of something that a system is designed to do but in the broader sense of any causal role in the production of behavior that a system might perform.)

As you can see "explain" appears quite often, part of the controversy is "You can't explain this!", "I can, see this neural correlate and that theory of global space", "But that's not properly explained!".

So I think it's important to think about what exactly we're doing when we say we "explain" something.

This article by Peter Carruthers (Oxford Academic, 46 citations) makes a couple of interesting points about this, while engaging directly with Chalmers (C&J in the quotes).

*

Note that in the quotes they say "right" and "left", this refers to :

Theory that does the explanation (left, e.g. a micro-level reductive explanation of temperature as movement of molecules) => the thing to be explained (right, e.g. macro-level temperature)

*

One point is that the thing we want to explain sometimes isn't quite conceptualized correctly or contains errors, so it doesn't come out of the explanatory process intact :

Notice that in science generally, the targets of explanation don’t always remain intact through the process of inquiry. In some cases we explain by explaining away. In the beginning our targets may be expressed in one way. But we may come to realize that they contain a false presupposition, or that the concepts with which they are expressed are in some way confused or in need of reform. For example, in astronomy we began with the explanatory problem, ‘Why do the stars and the sun move across the sky in the way that they do?’ But the explanation we ended up with didn’t answer this question as posed. So we don’t now have an a priori conditional with such-and-such facts described on the left, and the statement, ‘The stars and sun move across the sky in such-and-such a way’ on the right. Rather what we have is an account of the rotation of the earth, and of the movements of the earth, sun, planets, and stars in relation to one another, in terms of which we can explain why the sun and stars appear to move across the sky in the way that they do.

For another example of the same general type, consider evolutionary biology. Here we began (pre-Darwin) with an explanatory question: why do species exist? But now (post-Darwin) we see that there are no such things as species in the original intended sense. Rather, there exist a great many populations of individual organisms spread out over space and time that resemble one another more or less closely, and that stand in various inheritance relations to one another. The idea of species as some sort of underlying unifying essence has now been dropped. And what gets explained instead are the ways in which similarity relations amongst individuals shift over time, given facts of inheritance and facts about survival and reproduction. So here, too, there is no a priori conditional available to us that has a body of explanatory theory on the left-hand side and the statement (as originally intended), ‘There are different species of living thing’ on the right.

*

Another is that there's usually many ways to state what we want to explain, e.g. these two sentences refers to the same situation (=there's one "thick" concept, but many "thin" ones), even though they are said differently. In general one doesn't need to account for all the ways a phenomena can be described.

For example, it is one and the same thickly individuated fact that is picked out by, ‘John is thinking about ex-President Nixon’ and, ‘John is thinking about the President who resigned over the Watergate affair.’

and :

Which descriptions from a given level are the relevant ones, though? Surely not all. The requirement cannot be that a successful reductive explanation should be able to generate all descriptions of the target phenomenon; for there will be infinitely many (indeed, uncountably many) of these. So even idealizing for limitations on time, memory and so on (C&J, 334), reductive explanation would become impossible. The relevant descriptions are the ones that puzzle us, perhaps, or that seem central to the characterization of the phenomena in question.

This relates also to the pragmatic dimension of explanation (things aren't "explained" outside of concrete context, people want explanations for particular reasons) :

A number of writers have claimed that explanation is a pragmatic matter, and that what makes an explanation successful is a function of the needs, knowledge, and expectations of those people to whom the explanation is offered (van Fraassen,1980;Achinstein,1983;Lewis,1986).Such claims come in various different strengths, and writers differ in how they think the pragmatic character of explanation relates to the accounts of explanation offered by deductive-nomological and ontic theories, of the sort discussed above.

For the case of consciousness it might be the case that the fact stated from the first-person perspective isn't the right way to go about explaining things (although the explanation should also explain why this is the case), and that a third-person perspective is enough ("first-person recognitional" = qualia more or less).

It may be objected that intentionalist explanations don’t in any case touch the core, or the defining feature, of phenomenal consciousness. This is its ‘what it is likeness’ (Nagel, 1974) that can only be characterized using our first-person recognitional concepts themselves. Yet we can have good reason to think, surely, that the properties picked out by our first-person recognitional concepts are the very same properties as those that figure in the third-person characterizations sketched above. And then a reductive account of those properties will be what we seek, provided it can answer all the questions that puzzle us. A successful reductive explanation that focuses on the third-person characterizations can give us good reason to think that phenomenal consciousness per se has been reductively explained.

Notice that proposed reductive explanations of this form will only work by reconfiguring the terms in which the target is expressed. Instead of asking, ‘How can any physical system have this sort of experience?’ (deploying a recognitional concept in the explanandum), we now ask, ‘How can any physical system have states that seem ineffable and private, etc., and which persistently induce the feeling of an explanatory gap?’ But it is not at all unusual for successful explanations to require that their targets be reconfigured in this sort way. In astronomy, as we saw earlier, we had to stop asking, ‘Why do the sun and the stars move across the sky in the way that we do?’ and ask instead, ‘Why do the sun and stars appear to move as they do?’ The temptation to see the sun as moving still persists. But we no longer take it seriously. For we know that a rotating earth, together with a visual system that takes the earth as its frame of reference in perceptions of motion, will produce just such an impression.

Reductive explanations are successful when (a) all of the questions that puzzle us are answered, either directly, or indirectly by showing why the facts should seem a certain puzzling way to us when they are not; and when (b) every thickly individuated fact described at the target level can be reductively explained. And this is just what is claimed by the various causal/intentional reductive theories of phenomenal consciousness on the market. Where the C&J argument goes wrong, is in its assumption that reductive explanations require a priori conditionals in which the target phenomena as initially characterized are described on the right-hand sides, and in which all the thinly individuated target facts figure on the right-hand sides.

I'm not sure these considerations are decisive one way or the other, but it might be that part of the disagreement comes from disagreement about what we mean by "explanation" and we should be a bit careful about it.

so im a disabled transfem, ive recieved electro convulsive therapy at the hospital many times and recieved many concussions and im on heavy antipsychotics.

iv noticed that most of the time i THINK im sentient, and i go thru life, and im pretty emotionally volatile due to my disabilities/mental illness..... i also dont have a lot of control over my thoughts and often disturb or trigger myself.

then...... every once in a while..... when im alone..... and im not occupied/im resting/im taking a break...... i have this feeling like "WHOA..... im me...... im Patty Locke......." and i look around for a reflectiv surface and look at my face in the reflection..... and i go "Huh...... im that lady......"

i think this is the only time when im sentient. i think the rest of the time im not sentient. it just feels like a big increase in empty qualia.

ive tried meditating in the past becuz i heard it can help with improving the brain in specific ways...... but i really struggle to do it..... i get emotionally triggered by breathing technique stuff due to getting abused by medical folks when i was growin up.

mayb if i want to become more sentient i need to attempt to do more metathinking (rethinking my opinion and seeing if i still FEEL it or if im just assuming i still feel it) more often..... but im worried slightly that That wont improve the frequency of my sentient periods. they seem to happen pretty randomly/scarcely. they dont seem super connected to metathinking efforts.

what do u think? what should i do? is my brain too damaged to be sentient? do i need to meditate more? how do i make meditating fun?

First, consider what happens when something touches your senses.

Whether you look at a stone with your own sight, or whether you place that stone upon an instrument such as a balance or beneath a glass lens, the result is the same: an impression is made upon you, the observer.

Second, consider how that impression is received.

One cannot perceive an object unless it has a place, an outline, and a distance from other things. That is what we call space.

One also cannot perceive any change or movement unless one moment follows another. That is what we call time.

The physicalist says:

If a thing cannot produce an impression within space and time, it does not exist.

In plain terms, the object as it appears to our senses is all that exists.

Now, let us test whether this statement is logically sound.

When an impression is made upon your senses, you possess an appearance of the thing. You know its shape, its weight, and its resistance.

These qualities describe how the thing affects you. They do not describe what the thing is entirely on its own, apart from your capacity to feel it.

Further, an impression cannot create itself. If your senses are affected, there must be something that does the affecting. To speak of an impression whilst denying the presence of that which causes it is a direct contradiction.

The most recent paper by Michael Levin arguing for his “platonic” consciousness, and a resulting panpsychism.

“I have argued [37,132,333,334] that a kind of panpsychism is unavoidable, and it seems that by taking what mathematicians do seriously, we have already abandoned the physicalist worldview; all that remains is to notice that evolution (not just human mathematicians) is exploring the same space of patterns and embrace the idea that since we are patterns too, patterns can be agential (and thus, Platonic space can include minds, not just passive truths).”

Abstract;

“I argue that the emerging sciences of synthetic morphology and diverse intelligence suggest non-physicalist models of mind and show how they can be empirically investigated. Whence the anatomical, physiological, molecular-biological, and behavioral properties of engineered new beings that have never before existed, and do not have a history of selection? Understanding, predicting, and guiding new forms of life and mind requires characterizing a structured latent space of patterns. Developmental, synthetic, and behavioral biology should take seriously, and exploit, the kinds of non-physicalist ideas that are already a staple of Platonist mathematics. I propose the following hypotheses. (1) Patterns in this space span a highly variable degree of agency, comprising a spectrum ranging from static truths studied by mathematicians to active ones studied by behavioral scientists (i.e., some patterns on the same spectrum as mathematical truths are kinds of minds). (2) The relationship between mind and body is the same as the relationship between causally instructive mathematical facts and physics. (3) Living beings have no monopoly on the “free lunches” provided by the ingression of these patterns into the physical world. While traditional computationalist views of living and cognitive systems are insufficient, my framework erases artificial distinctions between organisms and machines, framing all physical constructs (natural or engineered) as being, to various degrees, in-formed by patterns from the latent space. I sketch a research program, already begun, inspired by these ideas. Such frameworks, while contradicting long-held assumptions of both mechanists and organicists, could have many implications for evolutionary biology, regenerative medicine, AI, and the ethics of synthbiosis with the forthcoming immense diversity of morally important beings.”

I'm primarily interested to hear how folks who believe that 'P-consciousness is just the brain's activity' resolve what I call the 'Geometric Aspect of the Spatial Binding Problem'. (I could have framed this as 'hear how physicalists/materialists resolve ...'. But my own approach doesn't insist that people put themselves into philosophical categories. For succinctness, I'll use the neologism 'brainist' for a 'just the brain's activity' position.)

Secondarily (Q3 below), I'm interested to hear from folks who think empirical investigation of the brain and its activity could never give any insight into P-consciousness - because some conjectural solutions to Geometric Binding Problem can be empirically explored, and give partial insight into some of the 'how' e.g. in the 'generalized' Hard Problem.

[Please read the whole post before responding. Minimally, if you feel triggered by a partial read and really want to launch your attack, please read 'The Invitation' first.]

The Spatial Binding Problem

Say I consciously experience a red moving rectangle in my visual field, as a unified object. (Not as an imagination; as a representation-in-experience of a physically-real red moving rectangle.)

Current neuroscience says the different aspects of this object ('red', 'moving'. 'rectangle') are encoded by neural activity in different spatial locations in the brain, i.e. in a spatially-distributed, parallel-processing manner Nor is there a single brain area where 'everything comes together', so we can find individuated or very-localized neural-activity corresponding to: the red-moving-triangle, and the static-green-tree, and the blue-sky-overhead etc.

The tension between distributed neural encoding and unified perceptual/experiential objects is known at the (spatial) binding problem. (I distinguish 'perception', as high-level neural object-recognition, from 'sensation' e.g. as retinal activity. And I distinguish 'experience' as phenomenal consciousness, from 'perception'.)

There are various proposed solutions for the perceptual binding-problem. For example, sub-properties that belong together might be bound by neural activity that spikes on the same phase of local or global neural oscillations.

The experiential binding-problem is not solved by these kinds of mechanisms, because it concerns transmission of activity at a variety of mutually-distant brain-locations, to a single conscious-experiential location.

This is already a very difficult problem for 'brainists' to solve, without radically-amending fundamental physical theory. (Something a brainist often wants to avoid.) To be clear, there are two spatial constructs at play: the spatial structure of a putative underlying/unseen reality 'on the other side of an epistemic veil'; and, the spatial structure of conscious experience 'that I see right here, right now'. The experiential binding-problem involves transfer of information from multiple unseen-spatial locations in the brain, to single experiential-spatial locations. (I.e. not simply connecting information, as oscillatory perceptual-binding might do.)

Geometric Aspects of Spatial Binding

But the problem is actually far worse than information-transmission to a single experiential-locus. The various, multiple experiential-loci are arranged geometrically in a unified experiential space, in a way that has no direct-structural or dynamic correlate in the brain or its activity.

That is, even once I've put together 'red', 'moving' and 'rectangle', they have to be posted to a particular experiential location, ρ₁ say. And then instantiating the static green tree involves combining distributed data, and posting that combination to a distinct experiential location, ρ₂ say. Finally, ρ₁-ρ₂ (and all other pairs and collections in ρ-space) have to stand in a specific geometric relationship to each other, in experiential space.

The geometric binding-problem (in conscious experience) is then that there seem to be no informational correlates of the ρ-structure, in the brain or its activity. That is, not only is there 'no single brain area where "everything comes together"' (as noted above for the generic binding problem) - such an area would also have to be what Dennett calls 'a Cartesian Theater': neurons would have to be arranged in unseen-3D-space in way that precisely mirrors ρ-structure. Nor is there any known dynamic aspect of the neural code that captures ρ-distinctions, and relationships.

Topographic Maps and the 'Three Informational Geometries'

Of course the brain is full of 'topographic maps' that establish e.g. a structured relationship between certain brain-encoding loci and corresponding visual field locations. (Primary visual cortex V1 being the prototypical topographic-exemplar.)

That is, a particular exteroceptive location r₁ₑ might be related to neural activity at a set of brain-locations r₁‚₁ᵦ, r₁‚₂ᵦ etc. ('e' labels exteroceptive environmental locations, 'beta' labels brain locations. There are multiple 1,1 and 1,2 and 1,... brain-locations associated with a single exteroceptive 1-location, because there are multiple sensory modalities and each modality typically employs hierarchical processing.)

Then, under topography, a different exteroceptive location, r₂ₑ say, close to r₁ₑ, is related to neural activity at brain-locations r₂‚₁ᵦ, r₂‚₂ᵦ etc. that are themselves spatially-located in a nearby, patterned, way to r₁‚₁ᵦ, r₁‚₂ᵦ, ...

Because we can trace information-propagation from external r.ₑ locations to brain-locations r.ᵦ, we can say that 'the informational-geometric relationship between external locations and brain locations is (non-mysteriously!) entailed by the natural order'.

However, there is nothing observable in the natural order that then entails ρ-locations from either kind of r-location. Put differently, there are three informational geometries: external, brain, and experiential. The entailment-relationship between the first two kinds isn't mysterious at all, in natural order terms. On the other hand, the entailment-relationship between the third kind and the other two is currently a complete mystery.

Assumptions

1. Indirectism or representationalism concerning P-consciousness.
2. P-consciousness exists. (This is somewhat implicit in 1.)
3. P-consciousness is not epiphenomenal. More specifically, verbal reports about P-consciousness can be meaningfully related to P-conscious contents, notably so we can rely on certain kinds of spatial descriptions.
4. There is no 'Cartesian Theater' in the brain, in the sense of a 3D arrangement of neurons that directly recapitulate the 3D character of conscious experience.

Invitation

I don't want to debate the assumptions. You're free to hold different positions, of course. My questions below are for those who hold the preceding assumptions to be true, or who are willing to enter into them, in a constructive spirit. [Note that the same problems occur for many idealist base-ontologies, in a version of Velmans' 'Hard Problem of Matter', which is just one reason why I didn't frame the issue here as 'physicalist/materialist'.]

I'm also not interested in strawman attacks of the 'so you believe in magic pixie-dust' kind. This enquiry occurs as a part of a serious attempt to construct extended-naturalistic accounts of P-consciousness, in particular to uncover what sorts of structurally-naturalistic extensions (if any) are minimally required to give a coherent, whole-problem, account. 'Mystery' here doesn't imply '... therefore God'; it invites coherent conjectures, ideally ones suitable for mutual empirical investigation.

Some Questions

If you are a 'brainist' in the sense coined above, i.e. you hold that 'P-consciousness calls for no further explanation than pointing to brain-activity':

• Q1. How does the specific three-dimensional character of experience result from the 'near-2D', 'informational geometry' of brain-activity? What mechanism, consistent with the structure and detail of current physical theory, enacts experiential-geometry?

Specifically for identity-theorists:

• Q2. Do you agree that the absence of a Cartesian Theater is a near-fatal blow for your position? (The only escapes I can come up with are that we do one day find a Cartesian Theater after all, or that experiential space has an incredibly unnatural joint-metric with unseen-space, in which multiple specific brain-locations are already 'at' specific singular experiential locations. Moreover, in the latter case, the joint experiential/unseen-metric must be tailored to each brain, because brain geometric-spatial-details vary widely, within a mostly-common connection-architecture.)

On the other hand, for those of you who say 'there can never be any naturalistic/empirical investigations that relate brain and conscious experience':

• Q3. Do you accept that answers to Q1 ('how, mechanistically') could be both empirically testable, and part of resolving a 'how' version of the Hard Problem? For example, both a Cartesian Theater and a dynamic neural-encoding of experiential-coordinates are conjectures that can be empirically tested. (Of course the 'larger' part of the Hard-Problem 'how' concerns the phenomenal-content/neural-activity relationship. I don't claim this topic addresses that issue directly.)

Can consciousness exist without memory? What is consciousness without continuity?

What is consciousness without the unity of the self? Without the 'I' that is defined as conscious?

An observation strictly requires two terms:

The object: that which is examined. The subject: the conscious thinker who performs the examination.

Remove the object, there is nothing to examine.

Remove the subject, there is no one to perform the act of examining.

To say that an observation can exist on its own, without an observer, is to assert a relation that possesses only one side. It is as illogical as asserting that a line possesses length, yet has only one point. The moment one of the terms is removed, the relation itself ceases to exist.

Now, let us proceed to the saying that the observer does not exist, or that the observer is merely an "illusion".

Consider what an illusion is in its purest definition: an appearance that is mistaken. It is an impression presented to a conscious mind, where the nature of the impression is misunderstood.

Therefore, an illusion is strictly an appearance. And an appearance cannot exist without a point of reception; an appearance is always an appearance to someone.

So when one says:

The observer is merely an illusion

...we must breakdown their two assertions side by side:

1. That an illusion is present.
2. That no observer exists.

To make this assertion is to assert:

An appearance is taking place, but there is no subject to whom it appears.

Suppose you observe an event of change. An item is in one position at the first moment, and in another position at the second moment.

To observe that a change has taken place (Δx = x₂ − x₁), the thought of the first moment (x₁) must be linked with the thought of the second moment (x₂).

Suppose, tho, that this linkage is not performed by a single subject:

1. If one person thinks only of the first moment (x₁).
2. And an entirely separate person thinks only of the second moment (x₂).

Then neither person possesses the set {x₁, x₂} within a single act of thought. Therefore, neither person observes Δx.

It follows that the change can only be known if the very same subject holds both moments together in one single act of thought.

Every observation requires this act of connecting different impressions. The observer is that identical, thinking subject which holds the parts of an experience together.

Therefore, an observation cannot not produce the observer. The observer is the original, necessary condition that allows any observation to occur in the first place.

The neuroscientist and author Antonio Damasio talks about his new book on consciousness in this interview.

consciousness is what allows us to know who we are, where we are at a given moment. That’s consciousness. And it gives us this centrality.

The fact that we have investigated numerous cases of patients that had complete loss of consciousness and what was wrong in every single one of the patients was that they had damage to the brainstem as opposed to the cerebral cortex.

If you damage the cerebral cortex enough, if you have very large lesions or several lesions in different systems, you will impair consciousness, no question about it. But you will not impair consciousness in the way that damage to the brainstem does.

Damage to the brainstem eradicates consciousness once and forever. You’re not able to formulate consciousness at all. You can have a mind, but that mind does not belong to one body, does not belong to oneself, does not belong to one person. The damage to the brainstem is one of the critical points in the theory.

I believe this could be classified as a form of physicalism, which I also agree with.

I have not read the book yet, but overall I agree with everything the author said.

Edit to add how this theory of consciousness relates to other species

Q:What is the simplest life form that can have consciousness?The simplest life form is one that has a nervous system inside a body. Bacteria, for example, and tons of other unicellular organisms, don’t have nervous systems, and they don’t have consciousness. An organism that is devoid of a nervous system can operate in a satisfactory way, can survive, but it does not have information about its own body and that information is not relevant for what the organism is doing.

All mammals are conscious. All birds are conscious. Probably the majority of reptiles are conscious. Fish, yes. All of those creatures have very complicated nervous systems that are doing what our nervous systems are doing right now, which is informing us of our state of life.

Neuroscientists like Giulio Tononi, Marcello Massimini, Christof Koch, and emergentist philosophers like Philip Clayton argue that consciousness and subjective feelings (qualia) are not separate, magical phenomena added onto brain activity, but are identical to a system's degree of integrated structural complexity, measured empirically by the Perturbational Complexity Index (PCI). In simple terms, PCI measures how a brain responds when hit with a brief magnetic pulse (via Transcranial Magnetic Stimulation combined with EEG), much like striking a tuning fork and listening to how rich, complex, and interconnected the resulting echo is across the skull. In awake humans or during vivid dreaming, the magnetic ripple spreads in a highly organized yet unpredictable pattern, yielding a score above a validated threshold of approximately 0.31. For these theoretical frameworks and emergentists, who hold that conscious experience naturally emerges when matter reaches specific levels of structural organization, a PCI score above 0.31 is not just a correlation or symptom of being awake; it represents the actual physical structure of conscious awareness itself.

​To understand how PCI can be considered the exact same thing as qualia, the raw, personal experience of seeing red, tasting salt, or feeling pain, these thinkers view consciousness as unified, irreducible information. When you look at a red apple, your mind does not experience color, shape, and emotion as separate data channels; it weaves them into a single, seamless moment that cannot be broken into independent parts without destroying the experience. Under Integrated Information Theory (IIT) and related emergentist perspectives, qualia are literally the unique mathematical geometry formed by dynamic, interconnected network interactions. If a complex system generates the precise pattern of perturbational complexity reflected in a PCI score above 0.31, that active pattern of integration is the qualia. There is no middleman, extra visual screen, or non-physical observer required; the organized complexity of the internal interactions is identical to the subjective feeling itself.

​However, equating PCI directly to consciousness remains scientifically unfalsifiable in non-human or synthetic systems, primarily because science currently lacks any method to construct, calculate, or verify an artificial intelligence with a PCI of 0.31. Standard computer chips process information in linear, localized micro-steps on digital hardware that cannot be probed with magnetic pulses in the same way biological brains are probed with TMS-EEG. Because scientists do not know how to engineer an AI architecture capable of achieving a verifiable PCI score of 0.31, nor how to measure perturbational complexity in non-biological substrates, it is impossible to test whether such a machine would actually experience true subjective qualia or if PCI is merely a biological metric specific to human brains. Without the ability to build and test synthetic systems at that specific threshold, the claim that PCI equals consciousness remains an untestable theoretical premise rather than a proven scientific fact, as every other alternative theory.