Thusness · John Tan

The Logical Necessity of a Substrateless World · Chapter 7 · Part III

Dissolving the Hard Problem of Consciousness

Part III Overview: Part III extends the analysis into the domain of mind, awareness, and subjectivity. Rather than treating consciousness as an internal container, a mysterious non-physical substance, or a secondary byproduct generated by dead matter, Part III shows that conscious experience is designated together with its objects, neither prior to them nor produced by them. By dismantling the substantialist framing that creates the 'Hard Problem', this Part shows how subjective awareness, deep sleep, death and personal continuity are designated in dependence, with nothing found to arise, persist or cease.

The Hard Problem as a Substantialist Artifact

In modern philosophy of mind, the 'Hard Problem of Consciousness'—famously framed by David Chalmers ('Facing Up to the Problem of Consciousness', 1995)—asks how and why physical processes in the brain give rise to subjective experience (qualia). Why should the firing of neurons be accompanied by the felt, qualitative experience of seeing red, feeling pain, or hearing a symphony?

On this analysis, the Hard Problem is not a feature of reality but an artifact of substantialist framing.

It is generated by two assumptions made together. The first is a particular kind of materialism: the physical world taken as an independent, non-conscious substrate of self-existing things—particles, fields, structures—complete without any experience. The second is a dualism of representation: consciousness taken as an inner container or spectator that must somehow produce or mirror the qualities the physical world has been defined to lack.

Once the two are defined in this way, bridging them becomes logically impossible. An unbridgeable 'explanatory gap' (Joseph Levine's phrase, 1983) is created not by nature, but by the metaphysical premise that first divides reality into two self-existing, mutually exclusive substances.

The Co-Arising of Subject and Object

The explanatory gap does not need to be bridged once the premise of isolated relata is dropped. Once no substrate is posited, qualitative properties—what philosophers call qualia—do not reside inside an 'external object', nor are they manufactured inside an 'internal subject'. Rather, the subject, the act of experiencing, and the experienced object are designated together, none prior to the others.

Perceived colour, which Chapter 10 examines in detail, is the clearest case: redness is found neither in a wavelength of light alone nor in a mind alone, but only where light, eye, nervous system, contrast and conceptual framing come together.

Qualitative properties are neither purely 'objective' nor purely 'subjective'; they are dependent appearances, identified within a framework that distinguishes perceiver from perceived, not products of a deeper process.

Consciousness Arises in Dependence

This was the early Buddhist account of consciousness long before it was a modern one. 'Dependent on the eye and forms, eye-consciousness arises; the meeting of the three is contact' (Majjhima Nikāya 18, trans. Ñāṇamoli and Bodhi). Consciousness here is not a standing light that is switched on and then directed at objects. It is named only as eye-consciousness, ear-consciousness and so on, each arising in dependence on its organ and its object. No consciousness is described that is not of something, through something.

Nāgārjuna presses the analysis further. Seeing, he notes, does not see itself; and if it cannot see itself, how could it see anything else (MMK 3.2)? The point is not that seeing fails to occur. It is that seeing cannot be found as a self-standing faculty that first exists and then reaches out to its objects; seer, seeing and seen are designated together, and none of them is found under analysis (MMK 3.6–8). The Hard Problem asks how a subjective light is kindled in objective matter. The Madhyamaka asks first whether a light, a matter or a kindling can be found apart from the others, and finds none.

Consciousness as Non-Dual Dependent Appearing

Once the split between an inner mind and an outer matter is set aside, consciousness no longer has to be either an emergent byproduct or a mysterious substance. It is not a container, an inner room in which experiences are stored or displayed. It is not a hidden producer, a homunculus standing behind experience to direct it. And it is not found apart from its objects, but is designated together with what it is aware of.

The feeling of awareness, the presence of sensory qualities and the coherence of mind are thoroughly real and functional conventionally and completely unfindable ultimately.

A Lived Example: A Sip of Tea

Take a sip of tea and try to separate the taste from the tasting. There is warmth, a faint bitterness, a sweetness at the edge of the tongue, a scent rising into the nose. Where is the taste? Not in the cup alone, for the same tea tastes different after a sweet meal and after a salty one, and different again with a cold. Not in the mouth alone, for without the tea there is no such taste. And there is no separate taster standing behind the tasting, receiving the flavour from somewhere else. Look for the one who tastes and you find only more of the tasting: the warmth, the bitterness, the swallow.

Yet the taste is not vague. It is precise enough that a skilled taster can name the garden and the season. This is consciousness as this book understands it: vivid, discriminating and reliable, designated as 'my tasting of this tea' within the ordinary framework of persons and things, and not found as a separate light in which the tea appears. Nothing here is a mystery waiting to be explained by something behind it. The mystery was produced by imagining a tea without tasting and a taster without tea, and then asking how the two could meet.

Objection: Doesn't the Hard Problem Survive?

A defender of the Hard Problem will not be satisfied. Grant that colour is co-arisen and that subject and object are designated together, David Chalmers might reply; the question remains why any of this is accompanied by experience at all—why there is something it is like to see red, in Thomas Nagel's phrase, rather than mere processing in the dark (Nagel, 'What Is It Like to Be a Bat?', 1974).

The reply turns on where the question starts. It begins from a physical world described completely without experience, and asks how experience is added to it. But that description was never given independently of experience. Mass, charge and wavelength are abstractions drawn from what is measured, seen and reported; the non-experiential world is a conventional framework, designated together with the experience it abstracts from, and then mistaken for the ground from which experience must be derived. Adam Frank, Marcelo Gleiser and Evan Thompson call this forgetting the 'blind spot' of science (The Blind Spot, 2024). Once the framework is recognized as a framework, the question of how experience arises from the non-experiential loses its starting point. Like Leibniz's question in Chapter 6, it is not answered but dissolved.

Objection: Isn't This Idealism, or Panpsychism?

If experience is not derived from matter, perhaps matter is derived from experience. Idealism makes mind the ground of all things. Panpsychism, in its most influential contemporary form, holds that consciousness is the intrinsic nature of matter—what physical entities are in themselves, beneath the relational structure that physics describes (see Philip Goff, Galileo's Error, 2019).

Neither is the view of this book. Idealism replaces one ground with another, and inherits all the difficulties Chapter 2 found in grounds. Panpsychism is, if anything, the opposite of this book's view: it starts from the claim that physics describes only relational structure, and concludes that there must be an intrinsic nature behind it—precisely what the preceding chapters have shown cannot be found. Experience and world are designated together, as the coldness and the ice were, and neither is the stuff of which the other is made.

Objection: Doesn't Brain Science Show That the Brain Produces Consciousness?

The evidence that experience depends on the brain is overwhelming. A blow to the head, a dose of anaesthetic or a small stroke can dim, fragment or end awareness; stimulating a patch of cortex can produce a flash of light or a tingling in the hand. Surely this shows that the brain is the producer, and consciousness its product.

The evidence shows dependence, and this book affirms dependence throughout. What it does not show is production in the substantialist sense, a self-standing brain on one side generating a separate consciousness on the other. The dependence runs both ways in the very practice that discovers it. A brain state is identified as the correlate of an experience only because the experience is reported, attended to and named; the neuroscientist's map is drawn from both ends at once. Conventionally, it is entirely correct to say that anaesthesia stops pain and that a stroke can take away speech, and medicine rightly acts on such knowledge. But the brain that 'produces' is itself an appearance, designated within the framework of physiology, and it is no more found from its own side than the experience it is said to produce. Dependence, here as everywhere, demonstrates emptiness. It does not install the brain as the ground.

Objection: Isn't Consciousness the One Thing We Cannot Doubt?

Descartes found one certainty that survived every doubt: I think, therefore I am. Whatever else is uncertain, the existence of the thinker seems not to be. Surely consciousness, at least, exists from its own side, since even the attempt to deny it is an instance of it.

What survives Descartes' doubt is less than he took it to be. That there is thinking, appearing, doubting is not in question, and this book has no wish to deny it. What does not follow is a self-standing thinker who owns the thoughts. Georg Christoph Lichtenberg made the point long ago: we should say 'it thinks', he suggested, as we say 'it lightens', and to say 'I think' is already to go beyond the evidence (The Waste Books). The Madhyamaka goes further than Lichtenberg. Not only is no owner found behind the thinking; the thinking, too, is not found as a standing substance. Its indubitability is the indubitability of vivid appearance, which this book has affirmed throughout, not the certainty of a ground.

Objection: What of the Luminous Mind?

Buddhist readers may raise a different concern. The tradition itself calls the mind luminous—'luminous, monks, is this mind', in an early discourse (Aṅguttara Nikāya 1.51–52)—and later traditions speak of clear light and of awareness as the nature of mind. Is the book denying something its own sources affirm?

It denies only one reading of them. If luminosity is taken as a radiant substance behind experience—an awareness that exists from its own side, in which appearances arise and pass—then it is one more ground, and the analysis of this book applies to it as to any other. But luminosity can be read otherwise: as saying simply that appearing is vivid and unobstructed, that nothing in the nature of things prevents the cold from stinging or the tea from tasting. Read in this way, luminosity is not a container but a description of appearance itself. The Tibetan tradition calls such display unobstructed (ma 'gags pa), which means not that something lasts for ever, but that nothing blocks its showing. It is the same taste this book has called surprisingly positive, and it is as empty as everything else.