The raw-experience dogma: Dissolving the “qualia” problem

metaphysicist

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The raw-experience dogma: Dissolving the “qualia” problem

by metaphysicist

16th Sep 2012

6 min read

342

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[Cross-posted.]

1. Defining the problem: The inverted spectrum

Philosophy has been called a preoccupation with the questions entertained by adolescents, and one adolescent favorite concerns our knowledge of other persons’ “private experience” (raw experience or qualia). A philosophers’ version is the “inverted spectrum”: how do I know you see “red” rather than “blue” when you see this red print? How could we tell when we each link the same terms to the same outward descriptions? We each will say “red” when we see the print, even if you really see “blue.”

The intuition that allows us to be different this way is the intuition of raw experience (or of qualia). Philosophers of mind have devoted considerable attention to reconciling the intuition that raw experience exists with the intuition that inverted-spectrum indeterminacy has unacceptable dualist implications making the mental realm publicly unobservable, but it’s time for nihilism about qualia, whose claim to exist rests solely on the strength of a prejudice.

A. Attempted solutions to the inverted spectrum.

One account would have us examine which parts of the brain are activated by each perception, but then we rely on an unverifiable correlation between brain structures and “private experience.” With only a single example of private experience—our own—we have no basis for knowing what makes private experience the same or different between persons.

A subtler response to the inverted spectrum is that red and blue as experiences are distinct because red looks “red” due to its being constituted by certain responses, such as affect. Red makes you alert and tense; blue, tranquil or maybe sad. What we call the experience of red, on this account, just is the sense of alertness, and other manifestations. The hope is that identical observable responses to appropriate wavelengths might explain qualitative redness. Then, we could discover we experience blue when others experience red by finding that we idiosyncratically become tranquil instead of alert when exposed to the long wavelengths constituting physical red. This complication doesn’t remove the radical uncertainty about experiential descriptions. Emotion only seems more capable than cognition of explaining raw experience because emotional events are memorable. The affect theory doesn't answer how an emotional reaction can constitute a raw subjective experience.

B. The “substitution bias” of solving the “easy problem of consciousness” instead of the “hard problem.”

As in those examples, attempts at analyzing raw experience commonly appeal to the substitution process that psychologist Daniel Kahneman discovered in many cognitive fallacies. Substitution is the unthoughtful replacement of an easy for a related hard question. In the philosophy of mind, the distinct questions are actually termed the “easy problem of consciousness” and the “hard problem of consciousness,” and errors regarding consciousness typically are due to substituting the “easy problem” for the “hard,” where the easy problem is to explain some function that typically accompanies “awareness.” The philosopher might substitute knowledge of one’s own brain processes for raw experience; or, as in the previous example, experience’s neural accompaniments or its affective accompaniments. Avoiding the “substitution bias” is particularly hard when dealing with raw awareness, an unarticulated intuition; articulating it is a present purpose.

2. The false intuition of direct awareness

A. Our sense that the existence of raw experience is self-evident doesn’t show that it is true.

The theory that direct awareness reveals raw experience has long been almost sacrosanct in philosophy. According to the British Empiricists, direct experience consists of sense data and forms the indubitable basis of all synthetic knowledge. For Continental Rationalist Descartes, too, my direct experience—“I think”—indubitably proves my existence.

We do have a strong intuition that we have raw experience, the substance of direct awareness, but we have other strong intuitions, some turn out true and others false. We have an intuition that space is necessarily flat, an intuition proven false only with non-Euclidean geometries in the 19^th century. We have an intuition that every event has a cause, which determinists believe but indeterminists deny. Sequestered intuitions aren’t knowledge.

B. Experience can’t reveal the error in the intuition that raw experience exists.

To correct wayward intuitions, we ordinarily test them against each other. A simple perceptual illusion illustrates: the popular Muller-Lyer illusion, where arrowheads on a line make it appear shorter than an identical line with the arrowheads reversed. Invoking the more credible intuition that measuring the lines finds their real length convinces us of the intuitive error that the lines are unequal. In contrast, we have no means to check the truth of the belief in raw experience; it simply seems self-evident, but it might seem equally self-evident if it were false.

C. We can’t capture the ineffable core of raw experience with language because there’s really nothing there.

One task in philosophy is articulating the intuitions implicit in our thinking, and sometimes rejecting the intuition should result from concluding it employs concepts illogically. What shows the intuition of raw experience is incoherent (self-contradictory or vacuous) is that the terms we use to describe raw experience are limited to the terms for its referents; we have no terms to describe the experience as such, but rather, we describe qualia by applying terms denoting the ordinary cause of the supposed raw experience. The simplest explanation for the absence of a vocabulary to describe the qualitative properties of raw experience is that they don’t exist: a process without properties is conceptually vacuous.

D. We believe raw experience exists without detecting it.

One error in thinking about the existence of raw experience comes from confusing perception with belief, which is conceptually distinct. When people universally report that qualia “seem” to exist, they are only reporting their beliefs—despite their sense of certainty. Where “perception” is defined as a nervous system’s extraction of a sensory-array’s features, people can’t report their perceptions except through beliefs the perceptions sometimes engender: I can’t tell you my perceptions except by relating my beliefs about them. This conceptual truth is illustrated by the phenomenon of blindsight, a condition in patients report complete blindness yet, by discriminating external objects, demonstrate that they can perceive them. Blindsighted patients can report only according to their beliefs, and they perceive more than they believe and report that they perceive. Qualia nihilism analyzes the intuition of raw experience as perceiving less than you believe and report you perceive, the reverse of blindsight.

3. The conceptual economy of qualia nihilism pays off in philosophical progress

Eliminating raw experience from ontology produces conceptual economy. A summary of its conceptual advantages:

A. Qualia nihilism resolves an intractable problem for materialism: physical concepts are dispositional, whereas raw experiences concern properties that seem, instead, to pertain to noncausal essences. If raw experience was coherent, we could hope for a scientific insight, although no one has been able to define the general character of such an explanation. Removing a fundamental scientific mystery is a conceptual gain.

B. Qualia nihilism resolves the private-language problem. There seems to be no possible language that uses nonpublic concepts. Eliminating raw experience allows explaining the absence of a private language by the nonexistence of any private referents.

C. Qualia nihilism offers a compelling diagnosis of where important skeptical arguments regarding the possibility of knowledge go wrong. The arguments—George Berkeley’s are their prototype—reason that sense data, being indubitable intuitions of direct experience, are the source of our knowledge, which must, in consequence, be about raw experience rather than the “external world.” If you accept the existence of raw experience, the argument is notoriously difficult to undermine logically because concepts of “raw experience” truly can’t be analogized to any concepts applying to the external world. Eliminating raw experience provides an effective demolition; rather than the other way around, our belief in raw experience depends on our knowledge of the external world, which is the source of the concepts we apply to fabricate qualia.

4. Relying on the brute force of an intuition is rationally specious.

Against these considerations, the only argument for retaining raw experience in our ontology is the sheer strength of everyone’s belief in its existence. How much weight should we attach to a strong belief whose validity we can't check? None. Beliefs ordinarily earn a presumption of truth from the absence of empirical challenge, but when empirical challenge is impossible in principle, the belief deserves no confidence.

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The raw-experience dogma: Dissolving the “qualia” problem

by metaphysicist

16th Sep 2012

6 min read

342

-4

[Cross-posted.]

1. Defining the problem: The inverted spectrum

A. Attempted solutions to the inverted spectrum.

B. The “substitution bias” of solving the “easy problem of consciousness” instead of the “hard problem.”

2. The false intuition of direct awareness

A. Our sense that the existence of raw experience is self-evident doesn’t show that it is true.

B. Experience can’t reveal the error in the intuition that raw experience exists.

C. We can’t capture the ineffable core of raw experience with language because there’s really nothing there.

D. We believe raw experience exists without detecting it.

3. The conceptual economy of qualia nihilism pays off in philosophical progress

Eliminating raw experience from ontology produces conceptual economy. A summary of its conceptual advantages:

4. Relying on the brute force of an intuition is rationally specious.

ConsciousnessDissolving the QuestionQualia

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New Comment

Rendering 0/342 comments, sorted by

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(show more) Click to highlight new comments since: Today at 6:11 AM

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Mitchell_Porter14y00

"Experiencing blue" is just what your brain does when it is exposed to a certain wavelength of light.

Sophistry. It's madness to say that the blue isn't actually there. But this is tempting for people who like the science we have, because the blue isn't there in that model of reality.

What we need is a model of reality in which experiences are what they are, and in which they play the causal role they appear to play. If our current physical ontology has no room for the existence of an actually blue experience in the brain, so much the worse for our current physical ontology. But modern physics is mathematical and operational, there is plenty of opportunity for something to actually be a conscious experience, while appearing in the formal theory as a state or entity with certain abstractly characterized structural and algebraic properties.

metaphysicist14y30

Sophistry. It's madness to say that the blue isn't actually there. But this is tempting for people who like the science we have, because the blue isn't there in that model of reality.

If by blue you mean--as you do--the purely subjective aspect of perceiving the color blue (call that "blue"), then it's only madness to deny it exists if you insist on confusing blue with "blue." No one but a madman would say blue doesn't exist; no philosopher should be caught saying "blue" exists.

If you can show a causal role for pure experien... (read more)

5[anonymous]14y

Ah, no. See, I am absolutely not saying that the blue isn't there. I agree that would be madness - I've experienced blue a million times. What I'm saying is this: During the times when your brain is in the "blue state" you also happen to be experiencing the sensation of blueness. Same goes for the sensation of pain and the brain state associated with pain. In fact, this partnership between brain-state and perception is so reliable that we're getting close to being able to record people's thoughts in video format by scanning their heads. (http://www.youtube.com/watch?v=nsjDnYxJ0bo&feature=player_embedded) The question is, if our model allows us to predict people's sensory experiences perfectly well on the basis of purely physical phenomena, why do we need posit qualia? Seems to me that the simplest theory that describes all the data is that causal relationships between physical things are the only things that exist in this universe. If you throw out the premises that sensations aren't physical things and that physical things aren't sensations then it suddenly seems like the most natural conclusion in the world, and I've never seen any evidence that prompted me to hold onto either of those premises. Here's a query - what did it feel like the last time you didn't have a brain state? Obviously that's a stupid question, it's impossible for you to have a brain without having it be in one state or another, and you don't have any memories from before you had a brain. Similarly, by definition you can't remember what it was like the last time you were experiencing absolutely nothing (if there was something to remember then you would have been experiencing something). So what piece of evidence was it that prompted you to hypothesise the existence of qualia?

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