The Hard Problem of Consciousness: 5 Answers Indian Philosophy Offers — and What 2025 Neuroscience Still Can’t Settle

By Dr. Narayan Rout | Author | Researcher |    Darshan & Philosophy Series  ·  32 min read  ·  Published: June 23, 2026

Contents In This Research Pillar

Table of Contents

1. Introduction
2. 1. What Is the Hard Problem, Precisely? Chalmers, the Explanatory Gap, and Why “Easy” Problems Aren’t Easy
3. 2. The 2025 Verdict: What the Cogitate Consortium’s Adversarial Test Actually Found
4. 3. Samkhya’s Answer — Purusha and Prakriti: Consciousness as a Fundamentally Separate, Non-Causal Category
5. 4. Advaita Vedanta’s Answer — Sakshin: Consciousness as the Sole Ground, Not a Product
6. 5. Kashmir Shaivism and Yoga’s Answers — Vimarsha’s Active Self-Awareness, and Patanjali’s Drishta/Drishya
7. The Quest Sage Insight
8. What You Can Do With This
9. Conclusion: Five Serious Answers, One Honestly Open Question
10. Frequently Asked Questions: The Hard Problem of Consciousness and Indian Philosophy
11. References and Sources
12. Further Reading On Related Topic

In 2025, an international team of researchers did something genuinely unusual in science: they got the proponents of two competing theories of consciousness to agree, in advance, on exactly what evidence would count against their own theory — and then ran the experiment. The result, published in Nature, was not a clean victory for either side. Neither Integrated Information Theory nor Global Workspace Theory, the two most prominent scientific accounts of how the brain produces conscious experience, came out of that adversarial collaboration clearly confirmed. After more than thirty years of serious, well-funded, methodologically rigorous neuroscience attacking this question directly, the hard problem of consciousness remains, in a real and specific sense, hard.

Here’s the thing worth sitting with before this article goes any further: Indian philosophy has been working on a version of this exact question for roughly 2,500 years, and it did not arrive at one tidy answer either. It arrived at several distinct, carefully argued, mutually critical positions — schools that genuinely disagreed with each other on the precise nature of consciousness, disagreements serious enough that one tradition’s most celebrated philosopher wrote formal refutations of another’s core logic. That internal disagreement is not a weakness in the tradition. It’s evidence the question was being taken seriously, the same way ongoing disagreement between IIT and Global Workspace Theory is evidence modern consciousness science is taking the question seriously too.

This article’s purpose is to do something that’s rarer than it should be: examine five of these real, distinct Indian philosophical positions with the same rigor this platform would apply to any scientific claim, neither inflating them into a premature “ancient India solved consciousness” narrative, nor dismissing them as merely poetic or pre-scientific. Each position gets named precisely, sourced to real scholarship, and held up against where it genuinely agrees and genuinely disagrees with both modern science and with each other.

Aham Brahmasmi |
I am Brahman — consciousness itself, not a product of it.

— Brihadaranyaka Upanishad 1.4.10, central to Advaita Vedanta’s framework

Getting this precisely right matters, because casual use of “the hard problem” tends to blur it with questions it doesn’t actually ask. Philosopher David Chalmers, in a 1995 paper that gave the problem its now-standard name, drew a sharp line between two very different kinds of question about consciousness.

The “easy” problems — a label Chalmers chose deliberately, not because these questions are simple, but because they are methodologically tractable — include explaining how the brain integrates sensory information, how attention is directed and shifted, how a person can verbally report on their own internal states, and how behavior gets produced in response to stimuli. These are extraordinarily difficult research problems in practice, but they share a common feature: a complete answer to each one is, in principle, achievable through standard neuroscience and cognitive science methods, because they’re questions about function and mechanism.

The hard problem is a different kind of question entirely: why does any of this functional processing come with subjective experience attached at all? Why is there something it is like to see the color red, to feel pain, to taste coffee — rather than all of this information processing simply happening, mechanically, with no inner experience accompanying it whatsoever? Philosopher Joseph Levine had already, in 1983, identified a closely related “explanatory gap” between physical descriptions of brain states and the subjective qualities (qualia) those states are associated with. Thomas Nagel’s famous 1974 paper, asking what it is like to be a bat, and Frank Jackson’s 1982 “Mary’s Room” thought experiment — in which a scientist who knows every physical fact about color vision but has never seen color seems to learn something genuinely new upon finally seeing red for the first time — are both frequently invoked to illustrate the same underlying gap: complete physical knowledge does not appear to logically entail knowledge of what an experience is like from the inside. (Ref. 1)

If the hard problem is going to be solved by neuroscience at all, the two leading scientific contenders for how that might happen are Integrated Information Theory (IIT), most associated with neuroscientist Giulio Tononi, and Global Workspace Theory (GWT), most associated with Bernard Baars and Stanislas Dehaene. Each makes specific, different, in-principle testable predictions about what should be happening in the brain during conscious experience.

IIT holds, roughly, that consciousness corresponds to a system’s capacity for integrated information — information that is unified and cannot be reduced to the sum of its independent parts, and predicts this integration should be reflected in specific, sustained patterns of activity in posterior brain regions. Global Workspace Theory holds that consciousness arises when information is broadcast widely across a “global workspace” of interconnected brain regions, enabling that information to become flexibly available to multiple cognitive systems at once, and predicts this should show up as a more distributed, frontally-involved pattern of neural activity, particularly around the onset and offset of conscious perception.

In 2025, the Cogitate Consortium published the results of an unusually rigorous test of both theories simultaneously, in the genuinely rare format of an adversarial collaboration: proponents of both IIT and GWT agreed, before data collection, on exactly which patterns of brain activity would count as supporting or undermining each theory’s specific predictions, removing the possibility of post-hoc reinterpretation of ambiguous results. Using 256 participants and three different neuroimaging methods — functional MRI, magnetoencephalography, and intracranial EEG — the study found a genuinely mixed result: the data did not clearly confirm either theory, with some predictions from each theory supported and others contradicted. (Ref. 2) The table below summarizes the two theories’ core claims and the 2025 result.

Theory	Core Claim	2025 Adversarial Test Result
Integrated Information Theory (IIT)	Consciousness = capacity for integrated, irreducible information, reflected in posterior brain activity	Predictions partially supported, partially contradicted — not clearly confirmed
Global Workspace Theory (GWT)	Consciousness = information broadcast across a frontally-involved ‘global workspace’	Predictions partially supported, partially contradicted — not clearly confirmed

This result followed a genuinely contentious 2023 episode in which more than 100 consciousness researchers signed an open letter publicly describing IIT as making pseudoscientific claims — a characterization IIT’s own proponents strongly disputed, and one that generated real controversy within the field about how theories of consciousness should even be evaluated. The 2025 adversarial collaboration was designed, in significant part, specifically to move that disagreement out of public argument and into direct, pre-registered empirical testing. The honest summary: even the most carefully designed, best-funded empirical test available today did not settle which scientific theory of consciousness, if either, is correct.

Samkhya is among the oldest systematic philosophical schools in the Indian tradition, and its answer to the hard problem is, in a real sense, the most direct: it simply denies that consciousness can be derived from matter at all, as a matter of basic ontology rather than as an open empirical question.

Samkhya proposes two fundamentally distinct, irreducible categories of existence. Prakriti is the entirety of matter, including, importantly, the mind, thought, intellect, and ego — all of this is considered insentient on its own terms, mere unconscious process, however complex. Purusha is pure consciousness, the witnessing principle, which contributes no content, undergoes no actual change, and performs no action — it simply witnesses. A peer-reviewed paper published in Religious Studies (Cambridge University Press) engages this framework directly against the hard problem, characterizing Samkhya’s position as proposing that “pure” consciousness is, by its very nature, a category that cannot even in principle be reduced to or explained in terms of physical processes — which is precisely the claim the hard problem’s defenders make about why physicalist neuroscience runs into a genuine, possibly unbridgeable, explanatory gap. (Ref. 3)

What makes this a real philosophical position rather than a restatement of mystery is its precision about where, exactly, the line falls: on Samkhya’s account, everything we’d ordinarily call “mental” — thoughts, emotions, the sense of being an individual self with a personality — belongs entirely to Prakriti, the insentient category. What makes any of this experience rather than mere unconscious process is its proximity to and reflection in Purusha, a kind of borrowed luminosity. This is a strong, specific, falsifiable-in-principle metaphysical claim: it would be straightforwardly wrong if consciousness turned out to be, in fact, reducible to a sufficiently complex physical process, which is exactly the kind of claim a serious philosophical position should be willing to make.

Advaita Vedanta, the non-dualist school most closely associated with the philosopher Shankara (traditionally dated to the 8th century CE), takes a structurally different approach from Samkhya, and it’s worth being precise about exactly how it differs, since the two are sometimes carelessly lumped together as “Indian dualism” or “Indian idealism” interchangeably.

Where Samkhya keeps Purusha and Prakriti as two equally real, separate categories, Advaita ultimately denies Prakriti’s independent, ultimate reality altogether. Consciousness — termed Sakshin, the witness, identical at the deepest level with Brahman, the unconditioned ground of all reality — is not one half of a pair. It is the sole, unconditioned, ever-present foundation of all experience, including the experience of having a body, a mind, and a world that appears external to that mind. A peer-reviewed paper published in the journal Yoga Mimamsa in 2020 engages the hard problem directly from this framework, and its central move is genuinely worth understanding precisely: Advaita does not try to answer the standard scientific question (“how does matter produce consciousness?”) within the terms that question sets up. It rejects the question’s framing entirely, inverting it: given that consciousness is already self-evidently present and undeniable — you cannot doubt that you are currently experiencing something, even if you doubt everything else — the real question becomes how consciousness comes to appear as though it were a material world and an individual, bounded experiencer at all. (Ref. 4)

On this account, the hard problem itself is described as a kind of category error, generated by the unexamined assumption that matter is more fundamental than consciousness, when Advaita’s entire philosophical edifice argues the reverse ontological priority. This is a genuinely different, and in some respects more radical, move than Samkhya’s dualism — and it’s also, on its own terms, a harder claim to test or falsify than Samkhya’s, since it denies the independent reality of the very physical world a scientific test would need to use as its measuring instrument.

Two further positions round out this article’s five, and both add genuine, distinct philosophical content rather than simply restating Samkhya or Advaita in different vocabulary.

Kashmir Shaivism’s Pratyabhijna (“recognition”) school, developed primarily by Utpaladeva and his student Abhinavagupta in the 9th and 10th centuries CE, introduces a technical distinction between Prakasha — the sheer luminous capacity of consciousness to reveal or manifest anything at all, its light-like quality — and Vimarsha — consciousness’s active, reflexive self-awareness, its capacity to know itself as itself, not merely to passively illuminate objects placed in front of it. The crucial, distinguishing claim here is that consciousness is not a passive, inert witness — a charge that can fairly be leveled at certain readings of Samkhya’s Purusha, and that Pratyabhijna philosophers leveled, at least implicitly, at readings of Advaita’s Sakshin that risk reducing it to a similarly static, uninvolved observer. Pratyabhijna instead holds that consciousness is inherently active, creative, and free (a quality termed svatantrya) — the world is not something that happens to appear before a static witness, but something consciousness actively manifests as an expression of its own dynamic nature. (Ref. 5) This is a real, specific point of disagreement with the other schools examined in this article, not a decorative restatement of them.

Patanjali’s Yoga Sutras, traditionally dated across a range from roughly the 2nd century BCE to the 4th century CE depending on scholarly assessment, open with a precise, technical definition rather than a poetic flourish: Yoga is the cessation (nirodha) of the fluctuations (vritti) of the mind (citta) (Yoga Sutra 1.2). Sutras 2.17 through 2.25 develop a framework structurally parallel to Samkhya’s dualism, using the specific terms Drishta (the seer, pure consciousness) and Drishya (the seen — the mind, its contents, and the entire observable world, including thought itself, which the Yoga tradition treats as an object to be witnessed rather than as the witness itself). The text identifies a specific, named confusion (samyoga, addressed directly in sutra 2.17) as the root of suffering: ordinary experience habitually mistakes the seer for the seen, consciousness appearing to itself as though it were identical with the mind’s passing thoughts and emotional states, rather than recognizing itself as their silent witness. The system’s stated goal, kaivalya (liberation, literally “aloneness” or isolation), is defined with real technical precision as the complete, final disentanglement of Drishta from Drishya — not a vague spiritual aspiration, but a specific, describable endpoint with a specific, describable method (the eight limbs of Yoga) for reaching it.

It is worth stating directly, in the interest of the honesty this platform’s standard requires: these five positions genuinely disagree with each other, and that disagreement is itself informative rather than embarrassing. Shankara’s own Advaita commentarial tradition includes an explicit historical refutation of Samkhya’s dualism, arguing that keeping Purusha and Prakriti as two equally real, fully independent categories generates a logical problem of infinite regress (anavastha dosha) in explaining how a wholly inert Prakriti and a wholly inactive Purusha could ever coherently appear connected or interact at all — a problem Advaita claims its own non-dual framework avoids, precisely by denying Prakriti’s independent ultimate reality in the first place. Presenting these five schools as one undifferentiated “ancient Indian view” of consciousness would itself be a credibility failure, not an act of respect toward the tradition; the respect lies in representing the real, rigorous internal debate accurately.

What strikes me most, holding the 2025 Cogitate Consortium result next to these five Indian philosophical positions, is how similarly structured the disagreement actually is on both sides, even though the methods couldn’t be more different. Neuroscience has two leading theories, tested as rigorously as current science allows, and the result is genuine, honest uncertainty — not because the scientists did poor work, but because the question itself resists the tools currently available to answer it. Indian philosophy has (at least) five distinct positions, argued with real logical rigor across many centuries, including formal refutations of each other’s core claims — and the result there, too, is genuine, unresolved philosophical disagreement, not because the philosophers were careless, but because, on the honest accounting this article has tried to give, this may simply be a question whose nature makes a single, final, universally compelling answer structurally difficult to reach by any method.

I want to be careful not to overstate the parallel between these two efforts, because they are not making the same kind of claim. IIT and Global Workspace Theory are scientific theories, built to generate falsifiable predictions testable by brain imaging — that is exactly what the 2025 adversarial collaboration tested. Samkhya, Advaita, Kashmir Shaivism, and Yoga are not making predictions about brain imaging data at all; they are making ontological and, in the traditions’ own terms, soteriological claims about the fundamental nature of reality and the path to liberation from suffering, verified, on their own account, through sustained first-person contemplative practice rather than third-person measurement. Holding both of these efforts seriously, on their own terms, without collapsing one into the other, is, I think, the only honest way to engage a question this difficult — and it’s exactly what this article has tried to do.

• Next time you encounter a claim that “science has proven” or “ancient wisdom already solved” the hard problem of consciousness, treat both claims with the same informed skepticism — per Section 2, even the best current adversarial science hasn’t settled it, and per Sections 3-5, Indian philosophy offers serious disagreement, not unanimous resolution.
• If you’re drawn to a contemplative practice like meditation or Yoga, it’s worth knowing which specific philosophical framework (Samkhya’s dualism, Advaita’s non-dualism, Patanjali’s Drishta/Drishya) underlies the particular tradition you’re practicing — the metaphysical claim being made differs meaningfully between them, even when the physical postures or breathing techniques look similar.
• Practice distinguishing, in your own reading and conversation, between a scientific theory (testable, falsifiable, evaluated by experiment, like IIT or GWT) and a philosophical or contemplative claim (evaluated by logical coherence and, in these traditions’ own terms, first-person verification) — conflating the two categories is the single most common error in popular writing about consciousness.
• If you want to explore Patanjali’s Drishta/Drishya distinction directly and experientially, sutras 2.17 through 2.25 are a focused, specific starting point — considerably more precise than general claims about “witnessing your thoughts” that circulate in wellness culture without their original technical grounding.
• Hold genuine intellectual humility about a question this hard, in both directions: resist the urge to declare it solved by either a favorite scientific theory or a favorite philosophical tradition, and stay genuinely curious about where the next decade of adversarial, rigorous testing — scientific and philosophical alike — might actually move the question forward.

The hard problem of consciousness, named precisely by David Chalmers in 1995 and tested as rigorously as current neuroscience allows in the Cogitate Consortium’s 2025 adversarial collaboration, remains genuinely open in mainstream science: neither Integrated Information Theory nor Global Workspace Theory was clearly confirmed by the best available evidence. Indian philosophy, working on a related question across roughly 2,500 years, did not arrive at a single tidy resolution either — it arrived at five distinct, internally rigorous, and genuinely disagreeing positions: Samkhya’s strict dualism, Advaita’s radical non-dual inversion of the question itself, Kashmir Shaivism’s insistence on consciousness as inherently active rather than passively witnessing, and Patanjali’s precise technical distinction between the seer and everything seen.

None of these traditions are equivalent to a scientific theory, and treating them as though they were — either to inflate their authority or to dismiss them by an inappropriate standard — misrepresents what kind of claim each is actually making. What they share with the best current neuroscience is something more modest and, I’d argue, more valuable than a shared answer: a record of serious, sustained, internally rigorous engagement with what may be the single hardest question available to any thinking tradition, anywhere, in any century.

1. Chalmers, D. (1995). Facing Up to the Problem of Consciousness. Journal of Consciousness Studies, 2(3), 200-219. The original paper coining the term ‘hard problem of consciousness.’ consc.net

2. Cogitate Consortium et al. (2025). Adversarial testing of global neuronal workspace and integrated information theories of consciousness. Nature. DOI 10.1038/s41586-025-08888-1. nature.com

3. Levine, J. (1983). Materialism and Qualia: The Explanatory Gap. Pacific Philosophical Quarterly, 64(4), 354-361. Stanford Encyclopedia of Philosophy, Qualia entry

4. Nagel, T. (1974). What Is It Like to Be a Bat? The Philosophical Review, 83(4), 435-450. org.uib.no

5. The hard problem of ‘pure’ consciousness: Sāṃkhya dualist ontology. Religious Studies, Cambridge University Press. Peer-reviewed direct engagement of Samkhya with the hard problem. cambridge.org

6. Advaita Vedanta’s answer to the hard problem of consciousness. Yoga Mimamsa (2020). Peer-reviewed direct engagement of Advaita Vedanta with the hard problem. journals.lww.com

7. Utpaladeva. Ishvara-pratyabhijna-karika (9th century CE), with commentary by Abhinavagupta (10th century CE). Foundational Pratyabhijna texts on Prakasha and Vimarsha. wisdomlib.org

8. Patanjali. Yoga Sutras, 1.2 and 2.17–2.25. Foundational text on citta-vritti-nirodha and the Drishta-Drishya distinction. wisdomlib.org

9. 2023 open letter on Integrated Information Theory and pseudoscience, as reported in mainstream science journalism. The consciousness-research community controversy preceding the 2025 adversarial collaboration. nature.com

10. Rout, N. Advaita Vedanta and Modern Science: 5 Convergences. TheQuestSage.com, Sl 74. Companion piece on Advaita’s broader engagement with modern science, referenced throughout Section 4. thequestsage.com

11. Rout, N. Six Schools of Indian Philosophy: The Darshanas. TheQuestSage.com, Sl 57. The foundational overview of all six classical Darshanas, including Samkhya and Yoga, referenced in Sections 3 and 5. thequestsage.com

12. Rout, N. Free Will vs Determinism. TheQuestSage.com, Sl 24. Companion philosophical piece on a related metaphysical question, relevant to this article’s broader Darshan series context. thequestsage.com

Darshan & Philosophy Series

• Six Schools of Indian Philosophy: The Darshanas (TheQuestSage.com, Sl 57) — The foundational overview of all six classical schools, including Samkhya and Yoga, examined in depth here.
• Advaita Vedanta and Modern Science: 5 Convergences (TheQuestSage.com, Sl 74) — The companion deep-dive on Advaita’s broader engagement with contemporary science.
• Free Will vs Determinism (TheQuestSage.com, Sl 24) — A related metaphysical question examined with the same evidence-first approach.
• Singularity and Advaita: When Silicon Valley’s Greatest Vision Meets India’s Oldest Truth (TheQuestSage.com) — A companion piece examining Advaita’s framework against a different modern frontier question.
• Carbon vs Silicon: 5 Fundamental Differences Between Human Intelligence and AI (TheQuestSage.com, Sl 68) — A companion piece on consciousness-adjacent questions in artificial intelligence.

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