Dennett argues fairly convincingly(by my lights anyway) against the ineffability, intrinsicality, privacy, and direct apprehensibility of the properties of conscious experience, and in doing so effectively grounds his rejection of qualia. It's worth noting that he does all this by offering physicalist explanations of actual counterexamples(intuition pumps) that are germane to historical notions of qualia/quale. In doing so, he shows that the properties of personal experience that make personal experience what it is, are not special in the sort of way that proponents of qualia claim. — creativesoul
Okay, a brave attempt at a summary, but you stayed at safe distance from Dennett's actual argument, only evoking his "intuition pumps" without trying to summarize any of them, so the argument is not transparently described. Let me try and fill in some blanks.
First, I agree that the broad intent of
Quining Qualia is to
disqualify qualia as a useful concept. This implies that according to Dennett, philosophical concepts can have clear-cut qualities, and that these clear-cut qualities are accessible to our consciousness, that we can assess them logically and objectively. In other words,
it assumes that concepts can be unambiguously defined, assessed and critiqued, which is a false premise. No philosophical concept worth its salt can be defined without ambiguity, and the concept of Qualia is no exception. (And in fact the paper later recalls Wittgenstein's skepticism regarding the possibility of a private language…)
Which is why concepts are hard to kill. They resuscitate in far less than 3 days. The zombies here are not us but them concepts. Which is interesting because you can crucify them again and again, usually on a cross made of other concepts. Such as the concept of intuition used by Dennett here. But these other concepts are no less likely to be doubted and poked around, they have not been vetted as well-defined by anyone…
For Dennett, intuition is evidently some kind of humor or juice that can get pumped up. So let’s scan through his pumps.
Intuition pump #1 (watching you eat cauliflower) openly pleads for the existence of qualia. Dennett says he cannot “isolate the qualia” but still hates that taste of steamed cauliflower…
IP#2 pleads for the qualia of wine taste to be an important enough motivation to conceivably drive the design and construction of wine tasting machines. I hope Dennett is not suggesting that the machine could enjoy wine, nor that we should produce wine so that machines can drink it?
The moral of IP#3 and #4, as per Dennett himself, is that no intersubjective comparison of qualia is possible, even with perfect technology, and therefore qualia are ineffable and private after all.
IP#5 and 6 (the neurosurgical prank and alternative neurosurgery) plead for our capacity to notice a discontinuity in qualia. If qualia did not exist, the subject would perceive no difference at all.
Intuition pump #7 (Chase and Sanborn the coffee tasters) seem to imply that qualia are subjective and private, but that memories of qualia are often unreliable, and that tastes changes over time.
In IP #8 (the gradual post-operative recovery) some scientists have objectively and verifiably inverted poor Chase’s qualia. When Chase reports otherwise, they insist that they did so even and that Chase is incorrect. Therefore the scientists affirm the objective existence of qualia, because you cannot change something that does not exist, and then insist that you did change it... That Chase reports otherwise is neither here nor there; it could simply be due to him trying to fool the scientists.
Intuition pumps #9 and 10 are closer to everyday experience. #9 is about acquired tastes like beer and IP #10 is about that fact that phenol-thio-urea tastes very bitter to some, and is tasteless as water to others. This proves that tastes can evolve, and they can depend on people: I don’t find bitter what you find bitter, apparently. But IP 10 also proves that tastes are genetically mediated, and hence have been selected throughout evolution. This means that a qualia such as “bitterness” are a product of our biology, which is an objective fact, and this fact lends them objectivity. Qualia can be studied through genetics, for instance, as in the case of phenol-thio-urea.
IP#11 (the cauliflower cure) is equivalent to IP#7 (Chase and Sanborn). Dennett’s experience of cauliflower is dramatically affected (for the better) after he eats a pill. He feels a strong qualitative change but since he cannot say if he was wrong before or what, he concludes that the taste of cauliflower does not exist (but now he likes it a lot…).
Intuition pump #12 (inverting spectacles) is about a well-known phenomenon: after wearing inverting spectacles (up is down and vice versa) for several days subjects make an astonishingly successful adaptation and seem to see things normally. It is similar to IP #8 where Chase's taste buds have been unethically inverted, but it is more real and less gross. Similarly to IP8, the scientists studying this know very well that the spectacles are inverting visual perception. So like IP8, IP12 proves only that qualia are real, objective, scientific phenomena.
Intuition pump #13 (the osprey cry) is about the difference between a verbal description of an osprey cry and hearing it. “So that's what it sounds like, I say to myself, ostending--it seems--a particular mental complex of intrinsic, ineffable qualia. … [but] from a single experience of this sort I don't--can't--know how to generalize to other osprey calls. Would a cry that differed only in being half an octave higher also be an osprey call? ” So first he understands a qualia then he wonders about how many of them ospreys he would need to hear to know the qualia of the osprey cry…
IP #14 (the Jello box) is a confused way to ask once again “whether your blue is my blue, your middle-C is my middle-C” and is thus similar to IP #1: qualia can differ from one person to the next, and are thus highly personal and subjective.
IP #15 (the guitar string) speaks of our capacity to disentangle harmonics in a guitar note or notes in a chord. “The difference in experience is striking.” And later: “you are still responding, as before, to a complex property so highly informative that it practically defies verbal description.” It’s is hard to leave this IP without an intuition that musical beauty is indeed complex and ineffable, even if it can be – as in this case – further broken down into sub-elements. And that’s the point he is trying to make of course, but you still cannot verbally describe fully the sound of a guitar, while you can still recognize it, even after this IP. Even if a sound can be broken down into its components, and perceived as such, even if a patch of color of your computer screen can be broken down in red, blue and green dots, even if qualia can be broken down in elementary qualia, that doesn’t make the elementary qualia any less ineffable.
So as per the paper’s “intuition pumps”, qualia are ineffable, subjective and personal, but also objective, scientific phenomena. They are economically important (and thus wine tasting machines are potentially profitable). They can be very beautiful. And they sometimes force even those philosophers who doubt their existence to give up forever on steamed cauliflower...