For Descartes, Locke, Berkeley, and Hume, there could be no problem when it came to the awareness of pain. They all took it for granted that of necessity a mind is always, at the time, infallibly informed regarding whatever “ideas” come its way — or whatever “perceptions,” in Hume's phraseology. As Hume put it: “Since all actions and sensations of the mind are known to us by consciousness, they must necessarily appear in every particular what they are, and be what they appear” (Hume, Reference Hume, Selby-Bigge and Niddich1978, p. 190).Footnote 1 (The use of “since” here seems to imply an argument or explanation; but what that might be is hard to guess.) When what was in question was the mind's current sensations, there was simply no place in these four thinkers’ philosophies for the occurrence of any sensations in the mind that were not fully conscious.
Philosophical followers of Wittgenstein and Sartre aside,Footnote 2 people today speak freely of “subliminal perceptions,” and, as far as dispositional states go, at any rate, we mostly have no difficulty with the conception of mental life that is not conscious. Surely our grandmothers — and perhaps, too, the grandmothers of the philosophers named — were in no doubt that it is only too possible, for instance, to fall in love without realizing it, or to fall out of love without realizing it.
Is pain a counter-example? Is it an example of how, in a certain sort of case, the existence of true belief and the existence of the fact believed are not really two different existences, of which each could occur without the other? It is not hard, perhaps, to admit the Cogito fact as such an example: our thought of that occurrence long ago is certainly something different from it, and yet Descartes’ thought of it right at the time was not. But could “subliminal pain” be something conceptually impossible?
In 1948, C. D. Hawkes and Nicholas Gotten reported to the American Neurological Association on 10 dying patients treated for intractable pain by pre-frontal lobotomy operations:
When questioned [after the operation] they all indicated that they realized some pain was present when they thought about it, but expressed indifference to it. (Hawkes & Gotten, Reference Hawkes and Gotten1948, p. 209)
Anaesthesiologist Henry K. Beecher reported on U.S. soldiers wounded at the World War II Battle of Anzio in Italy:
A very high percentage of the wounded soldiers, although in good general condition, entirely denied pain from their extensive wounds or had so little they did not want any medication to relieve it. (Beecher, Reference Beecher1959, p. 165)
“These men,” Beecher notes, “were clear mentally, and not in shock; they had not had narcotics recently and none at all in many cases” (Beecher, Reference Beecher1959, p. 164). But patients like that, he says, “complain as vigorously as normal men at an inept venipuncture; so there is no total pain block” (Beecher, Reference Beecher1959, p. 166).
Psychologist Ronald Melzack and neurologist K. L. Casey comment that this
is interpreted by specificity theorists … to mean that their joy at having escaped alive from the battlefield blocked only their reaction to pain, but not pain sensation itself. If this is the case, then pain sensation is not painful, .… Rather than face the paradox of nonpainful pain …, it seems more reasonable to say simply that these men felt no pain after their extensive injuries, that the input was blocked or modulated by cognitive activities before it could evoke the motivational-affective processes that are an integral part of the total pain experience. (Melzack & Casey, Reference Melzack, Casey and Kenshalo1968, p. 425)
The lobotomized patients said that they did notice their pain when they thought about it, but even then they were indifferent to it. The “specificity theorists” of pain neurology said that the wounded soldiers were all in pain, but that not all of them realized that. Melzack and Casey, though, will not hear of such things. After all, it is not necessarily amiss for scientists sometimes, on conceptual grounds, to overrule — or to “reinterpret” — what people spontaneously say. Ordinary language can be inconsistent; it can be confused. And Melzack and Casey do have a point about the absurdity of “nonpainful pain.” It would not be difficult to rule the possibility of “subliminal pain” out by a linguistic stipulation to the effect that nothing of which the mind is not at the time aware can count as “pain.”Footnote 3 And what we can stipulatively accomplish by design, natural language can accomplish — or can have already accomplished — through its processes.Footnote 4
Even when consistent and unconfused, the semantics of ordinary-language expressions can be “multi-stranded” and rather lacking in boundary-precision. The question here is not what the exact meaning of the English word “pain” is, but whether it is ever possible for the word to stand for something whose presence and whose absence alike are infallibly known by the mind affected. For the “naive” concept of a “set,” it turns out “there is no room in logical space,” for example — a fact known since the work of Bertrand Russell over a century ago.Footnote 5 Could a parallel surprise be in store for us when it comes to pain?
Certainly, the easiest way to ensure the logical infallibility of a belief that one is not in pain would be by way of stipulating that to be in “pain” is to be in some state S and know that. But couldn't one fail to also know that — the fact that one was in state S and knew that? Or know that fact, but fail to know that one knows it? The mind's awareness of something need not guarantee any awareness of that awareness, it would seem, and, if no “pain” experience has occurred without an awareness of it, then that of which the awareness is an awareness is not a “pain” experience without an awareness also of that awareness. And so on. Nothing in a finite being's mental life can be of more than finite complexity; and so, are we not presented here with an impossible infinite regress?
However, if the term “awareness” means something dispositional, or else means whatever non-dispositional reality it is in the mind that gives rise to the disposition(s) in question, then this is not going to be a problem. For a single “base” reality can give rise to any number of distinct dispositional facts — facts about what would happen if certain things were to take place. It is unproblematically the case that, as you read these words, you are aware that you are reading them, and aware as well of that awareness, and also aware of that awareness — and so on. And so, nothing stands in the way of language itself ruling out the possibility of any “pain” which the mind is unaware of.Footnote 6
That, then, would give us half of logical infallibility. It can be impossible to be in pain without being aware of it. But can it be impossible also to believe that you are in pain without actually being in any pain? Conceivably some of Beecher's pain-denying wounded could be persuaded by medical experts that their neurological state was such that they “really were in pain” in spite of appearances to the contrary; and conceivably those experts could be simply lying about the patients’ neurological states. But even if this were not just a case of employing “scientific” flim-flam so as to get lay people to accept a misuse of language, it would not be a significant counter-example in the present context. Surely the prime candidate here for logical infallibility is immediate, that is, unreasoned, belief that one is currently in pain.
An easy way of stipulatively ruling out any possibility of having an immediate sense of being in pain without in fact experiencing any, would be to define being in “pain” as being in some state S or having an immediate impression of being in state S or having an immediate impression of having an immediate impression of being in state S or … — but that would sacrifice the logical infallibility of an unreasoned belief that one isn't in pain.
Eric Schwitzgebel writes:
What about pain, a favorite example for optimists about introspection? Could we be infallible, or at least largely dependable, in reporting ongoing pain experiences? … It is hard, seemingly, to go too badly wrong in introspecting really vivid, canonical pains …. And the case of pain is not always as clear as sometimes supposed. … There's confusion between mild pains and itches or tingles. There's the football player who sincerely denies he's hurt. There's the difficulty we sometimes feel in locating pains precisely or in describing their character. I see no reason to dismiss, out of hand, the possibility of genuine introspective error in these cases. Psychosomatic pain too: Normally, we think of psychosomatic pains as genuine pains, but is it possible that some, instead, involve sincere belief in a pain that doesn't actually exist? (Schwitzgebel, Reference Schwitzgebel2008, pp. 259–260; cf. Haybron, Reference Haybron2007, p. 406)
By contrast, the claim here will be that the use of a word like “pain” in natural language is sufficiently indeterminate, covering as it does a spread of related senses, that in some of those senses it is logically impossible to be in error “immediately” as to whether you are in pain, because the thought that you are in pain and the pain are really the same thing. The problem taken up is the problem of how it is possible for a thought (other than a thought like Descartes’ Cogito thought) to have for its whole subject-matter: itself. (Without any Liar Paradox resulting.Footnote 7)
What is pain? It is an immediately aversive sensation “referred” to a spot in the subject's body (including, of course, as we know, body parts now missing: “phantom limbs”). The pain sensation has in each case its own phenomenological character — “crushing,” “burning,” “tearing,” etc. — in addition to features such as intensity, spread, and intermittance. But, as Melzack and Casey say, in effect, without aversiveness it is not what we call “pain.” There must be in the mind a desire (or a suppressed tendency to desire) that conditions be different from what they are at the spot in the body where the pain is felt. And with that aversiveness, the sensation is painful, whatever else it is phenomenologically.
Is not a “desire” for any result a (defeasible, that is, outweighable) disposition — or whatever mental reality gives rise to such a disposition — to try, should it be possible and necessary, to bring that result about? In other words, something mental which expresses itself, should such be known to be possible and necessary, in means-taking action. However, a belief that one desires something, no matter how ill founded, can readily give rise likewise to means-taking action aimed at securing it (overridably, of course, should a contrary-tending desire be strong enough). Hence, such a belief can be a “desire,” in the standard sense of the word. And so, to have an “immediate” sense that you are in pain somewhere can amount to being in pain there. This can be the other half of the sought-for logical infallibility semantics (the pain/apparent-pain equivalence). Though a belief can sometimes be a desire, it is still true that to believe something to be so is not to desire it to be so. In the present case, it is to desire something else: what is here believed is that a desire exists; what is desired is not that supposed desire, but rather its object, relief from an aversive sensation (thus rendering the belief correct).
But how could having an (unreasoned) opinion that one was in some desire-state ever amount to being in that state? Don't folk psychology and philosophical theory tell us alike that our desires and our beliefs comprise, as it were, two blades of the “scissors-action” which produces purposive behaviour — one “blade” giving us our goals, the other giving us our estimate of pertinent opportunities and obstacles? According to this model, all voluntary behaviour is the result, jointly, of such an ensemble of motivations (of various different strengths) and an ensemble of beliefs (held with various degrees of confidence) — with distinct psychological roles being played by the desires, on the one hand, and the beliefs, on the other hand. Metaphor aside, though, why couldn't the same mental state ever play (part of) both roles?
In the absence of any argument to the contrary, it appears that it need not be only with the Cogito that we can see an example of believing the occurrence of which logically ensures the belief's truth because the existence of the believing and the existence of the fact believed are really not two different existences.
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Appendix
I wrote that “nothing stands in the way of language itself ruling out the possibility of any ‘pain’ which the mind is unaware of.” But in Knowledge and Its Limits, Timothy Williamson (2002) formulates an argument against this — even allowing that being in pain does necessitate believing one is in pain — an argument which Williamson advances, denying expressly that it is simply the exploitation of a sorites sophism.Footnote 8 Given that (1) it is necessarily always the case that one is either in pain or not in pain, and (2) that there necessarily are borderline cases where one can fail to know whether one is in pain or is not in pain, Williamson (Reference Williamson2002, pp. 96–98, 106) concludes, in effect, that one's being in pain cannot entail knowing one is in pain.
Contrariwise, “is in pain” is vague in such a way that, for any borderline state of feeling, when one is in it, one is “in pain” in some sharpened senses of “in pain” and not “in pain” in some sharpened senses of “in pain.” (Sharpened senses do not have to be completely precise.) Hence, there is no logical barrier to a ruling that, for any sufficiently sharpened sense of “in pain,” only cases where one knows one is “in pain” will count as cases of being “in pain.” Knowing a given truth need not entail possessing sufficient vocabulary to state that truth. (Premise 2 here would be defensible, perhaps, with “can be unable to say” substituted for “can fail to know.”)
To something like this reasoning Williamson (Reference Williamson2002, pp. 104–105) objectsFootnote 9 that to count as knowledge the reliability of the basis of one's belief must at least somewhat exceed the minimum degree of confidence that suffices for mere belief; and so, with only just that much confidence, just that reliably based, you would not know; hence, one could be in any state of consciousness (only just in it) and even believe oneself to be in it, without knowing one was in it.
But must that degree of a thought's reliability requisite for knowledge exceed the degree of confidence needed to turn a mere suspicion into a belief? Arguably, the actual use of these expressions is less than sufficiently determinate to guarantee the needed premise for Williamson's case.
It is true that people do say things like “In the light of present evidence, there are sufficient grounds for believing that such-and-such is caused by so-and-so, but the causation of such-and-such by so-and-so is not yet something which is known.” However, arguably the point they are making in saying this is that there are not yet sufficient grounds for saying the causation of such-and-such by so-and-so is something which is known. For “It is known that …” entails “It is true that …” and, indeed, “….” If you state that …, you in effect give your word that …. You open yourself to being found at fault epistemically in the event that your basis for giving your word that … isn't strong enough.
(To claim something to be known commits the speaker to having a reliable basis for believing it but not necessarily to considering the basis of every knower's belief to be similarly reliable. “The signs of what was going to ensue fell short of being altogether certain, but they were good enough for several of those paying attention to know in advance — even though not to know for sure — that it would in a short time begin happening.” “It was known that …” commits the speaker to “It is sufficiently certain that …” but not to “It was sufficiently certain that ….”)