I tend to the view that all philosophical problems can be represented as aporetic polyads. What's more, I maintain that philosophical problems ought to be so represented. You haven't begun to philosophize until you have a well-defined puzzle, a putative inconsistency of plausibilities. When you have an aporetic polyad on the table you have something to think your teeth into. (An interesting and auspicious typo, that; I shall let it stand.)
Consider the problem of the existence of consciousness. Nicholas Maxwell formulates it as follows: "Why does sentience or consciousness exist at all?" The trouble with this formulation is that it invites the retort: Why not? The question smacks of gratuitousness. Why raise it? To remove the felt gratuitiousness a motive has to be supplied for posing the question. Now a most excellent motive is contradiction-avoidance. If a set of plausibilities form an inconsistent set, then we have a problem. For we cannot abide a contradiction. Philosophers love a paradox, but they hate a contradiction. So I suggest we put the problem of the existence of consciousness as follows:
1. Consciousness (sentience) exists.
2. Consciousness is contingent: given that it exists it might not have.
3. If x contingently exists, then x has an explanation of its existence in terms of a y distinct from x.
4. Consciousness has no explanation in terms of anything distinct from it.
A tetrad of plausibilities. Each limb makes a strong claim on our acceptance. Unfortunately, this foursome is logically inconsistent: the conjunction of any three limbs entails the negation of the remaining one. Thus the conjunction of (1) and (2) and (3) entails the negation of (4). So the limbs cannot all be true. But they are all very plausible. Therein lies the problem. Which one ought we reject to remove the contradiction?
Note the superiority of my aporetic formulation to Maxwell's formulation. On my formulation we have a very clear problem that cries out for a solution. But if I merely ask, 'Why does consciousness exist?' there is no clear problem. You could retort, 'Why shouldn't it exist?' 'What's the problem?' There is a problem because the existence of conbsciousness conflicts with other things we take for granted.
(1) is absolutely datanic and so undeniable. If some crazy eliminativist were to deny (1) I would show him the door and give him the boot. (Life is too short for discussions with lunatics.)
(4) is exceedingly plausible. To explain consciousness in terms of itself would be circular, hence no explanation. So it has to be explained, if it can be explained, in terms of something distinct from it. Since abstract objects cannot be invoked to explain concrete consciousness, consciousness, if it can be explained, must be explained in physical and physiological and chemical and biological terms. But this is also impossible as Maxwell makes clear using a version of the 'knowledge argument' made popular by T. Nagel and F. Jackson:
But physics, and that part of natural science in principle re-ducible to physics, cannot conceivably predict and explain fully the mental, or experiential, aspect of brain processes. Being blind from birth—or being deprived of ever having oneself experienced visual sensations—cannot in itself prevent one from understanding any part of physics. It cannot prevent one from understanding the physics of colour, light, physiology of colour perception and discrimination, just as well as any nor-mally sighted person. In order to understand physical concepts, such as mass, force, wavelength, energy, spin, charge, it is not necessary to have had the experience of any particular kind of sensation, such as the visual sensation of colour. All predictions of physics must also have this feature. In order to understand what it is for a poppy to be red, however, it is necessary to have experienced a special kind of sensation at some time in one’s life, namely the visual sensation of redness. A person blind from birth, who has never experienced any visual sensation, cannot know what redness is, where redness is the perceptual property, what we (normally sighted) see and experience, and not some physical correlate of this, light of such and wave-lengths, or the molecular structure of the surface of an object which causes it to absorb and reflect light of such and such wavelengths. It follows that no set of physical statements, however comprehensive, can predict that a poppy is red, or that a person has the visual experience of redness. Associated with neurological processes going on in our brains, there are mental or experiential features which lie irredeemably beyond the scope of physical description and explanation.
(2) is also exceedingly plausible: how could consciousness (sentience) exist necessarily? But (3), whichis a versionof the principle of sufficient reason, is also very plausible despite the glib asseverations of those who think quantum mechanics provides counterexamples to it.
So what will it be? Which of the four limbs will you reject?
I am tempted to say that the problem is genuine but insoluble, that the problem is an aporia in the strongest sense of the term: a conceptual impasse, an intellectual knot that our paltry minds cannot untie.
But this invites the metaphilosophical response that all genuine problems are soluble. Thus arises a metaphilosophical puzzle that can be set forth as an aporetic triad:
5. Only soluble problems are genuine.
6. The problem of the existence of consciousness is not soluble.
7. The problem of the existence of consciousness is genuine.
This too is an inconsistent set. But each limb is plausible. Which will you reject?
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