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Some philosophers hold that though experiences are brain processes they nevertheless have fundamentally non-physical, psychical, properties, sometimes called qualia. Here I shall take the identity theory as denying the existence of such irreducible non-physical properties. Some identity theorists give a behaviouristic analysis of mental states, such as beliefs and desires, but others, sometimes called central state materialists, say that mental states are actual brain states. Identity theorists often describe themselves as materialists but physicalists may be a better word. That is, one might be a materialist about mind but nevertheless hold that there are entities referred to in physics that are not happily described as material.
In taking the identity theory (in its various forms) as a species of physicalism, I should say that this is an ontological, not a translational physicalism. It would be absurd to try to translate sentences containing the word brain or the word sensation into sentences about electrons, protons and so on. Nor can we so translate sentences containing the word tree. After all tree is largely learned ostensively, and is not even part of botanical classification. If we were small enough a dandelion might count as a tree. Nevertheless a physicalist could say that trees are complicated physical mechanisms. The physicalist will deny strong emergence in the sense of some philosophers, such as Samuel Alexander and possibly C.D. Broad . The latter remarked (Broad 1937) that as far as was known at that time the properties of common salt cannot be deduced from the properties of sodium in isolation and of chlorine in isolation. (He put it too epistemologically: chaos theory shows that even in a deterministic theory theory physical consequences can outrun predictability.) Of course the physicalist will not deny the harmless sense of "emergence" in which an apparatus is not just a jumble of its parts (Smart 1981).
Place's very original and pioneering paper was written after discussions at the University of Adelaide with Smart and C.B. Martin. For recollections of Martin's contributions to the discussion see Place (1989) Low Claim Assertions in Heil (1989). Smart at the time argued for a behaviourist position in which mental events were elucidated purely in terms of hypothetical propositions about behaviour, as well as first person reports of experiences which Gilbert Ryle regarded as avowals. Avowals were thought of as mere pieces of behaviour, as if saying that one had a pain was just doing a sophisticated sort of wince. Smart saw Ryle's theory as friendly to physicalism though that was not part of Ryle's motivation. Smart hoped that the hypotheticals would ultimately be explained by neuroscience and cybernetics. Being unable to refute Place, and recognizing the unsatisfactoriness of Ryle's treatment of inner experience, to some extent recognized by Ryle himself (Ryle 1949, p. 240), Smart soon became converted to Place's view (Smart 1959). In this he was also encouraged and influenced by Feigl's "The Mental" and the "Physical" (Feigl 1958, 1967). Feigl's wide ranging contribution covered many problems, including those connected with intentionality, and he introduced the useful term nomological danglers for the dualists' supposed mental-physical correlations. They would dangle from the nomological net of physical science and should strike one as implausible excrescences on the fair face of science. Feigl (1967) contains a valuable Postscript.
The logical objections which might be raised to the statement consciousness is a process in the brain are no greater than the logical objections which might be raised to the statement lightning is a motion of electric charges.It should be noticed that Place was using the word logical in the way that it was used at Oxford at the time, not in the way that it is normally used now. One objection was that sensation does not mean the same as brain process. Place's reply was to point out that this table does not mean the same as this old packing case and lightning does not mean the same as motion of electric charges. We find out whether this is a table in a different way from the way in which we find out that it is an old packing case. We find out whether a thing is lightning by looking and that it is a motion of electric charges by theory and experiment. This does not prevent the table being identical with the old packing case and the perceived lightning being nothing other than an electric discharge. Feigl and Smart put the matter more in terms of the distinction between meaning and reference. Sensation and brain process may differ in meaning and yet have the same reference. Very bright planet seen in the morning and very bright planet seen in the evening both refer to the same entity Venus. (Of course these expressions could be construed as referring to different things, different sequences of temporal stages of Venus, but not necessarily or most naturally so.)
There did seem to be a tendency among philosophers to have thought that identity statements needed to be necessary and a priori truths. However identity theorists have treated sensations are brain processes as contingent. We had to find out that the identity holds. Aristotle, after all, thought that the brain was for cooling the blood. Descartes thought that consciousness is immaterial.
It was sometimes objected that sensation statements are incorrigible whereas statements about brains are corrigible. The inference was made that there must be something different about sensations. Ryle and in effect Wittgenstein toyed with the attractive but quite implausible notion that ostensible reports of immediate experience are not really reports but are avowals, as if my report that I have toothache is just a sophisticated sort of wince. Place, influenced by Martin, was able to explain the relative incorrigibility of sensation statements by their low claims: I see a bent oar makes a bigger claim than It looks to me that there is a bent oar. Nevertheless my sensation and my putative awareness of the sensation are distinct existences and so, by Hume's principle, it must be possible for one to occur without the other. One should deny anything other than a relative incorrigibility (Place 1989).
As remarked above, Place preferred to express the theory by the notion of constitution, whereas Smart preferred to make prominent the notion of identity as it occurs in the axioms of identity in logic. So Smart had to say that if sensation X is identical to brain process Y then if Y is between my ears and is straight or circular (absurdly to oversimplify) then the sensation X is between my ears and is straight or circular. Of course it is not presented to us as such in experience. Perhaps only the neuroscientist could know that it is straight or circular. The professor of anatomy might be identical with the dean of the medical school. A visitor might know that the professor hiccups in lectures but not know that the dean hiccups in lectures.
Suppose that I have a yellow, green and purple striped mental image. We may also introduce the philosophical term sense datum to cover the case of seeing or seeming to see something yellow, green and purple: we say that we have a yellow, green and purple sense datum. That is I would see or seem to see, for example, a flag or an array of lamps which is green, yellow and purple striped. Suppose also, as seems plausible, that there is nothing yellow, green and purple striped in the brain. Thus it is important for identity theorists to say (as indeed they have done) that sense data and images are not part of the furniture of the world. I have a green sense datum is really just a way of saying that I see or seem to see something that really is green. This move should not be seen as merely an ad hoc device, since Ryle and J.L. Austin, in effect Wittgenstein, and others had provided arguments, as when Ryle argued that mental images were not a sort of ghostly picture postcard. Place characterised the fallacy of thinking that when we perceive something green we are perceiving something green in the mind as the phenomenological fallacy. He characterizes this fallacy (Place 1956):
the mistake of supposing that when the subject describes his experience, when he describes how things look, sound, smell, taste, or feel to him, he is describing the literal properties of objects and events on a peculiar sort of internal cinema or television screen, usually referred to in the modern psychological literature as the phenomenal field.Of course, as Smart recognised, this leaves the identity theory dependent on a physicalist account of colour . His early account of colour (1961) was too behaviourist, and could not deal, for example, with the reversed spectrum problem, but he later gave a realist and objectivist account (Smart 1975). Armstrong had been realist about colour but Smart worried that if so colour would be a very idiosyncratic and disjunctive concept, of no cosmic importance, of no interest to extraterrestrials (for instance) who had different visual systems. Prompted by Lewis in conversation Smart came to realize that this was no objection to colours being objective properties.
One first gives the notion of a normal human percipient with respect to colour for which there are objective tests in terms of ability to make discriminations with respect to colour. This can be done without circularity. Thus discriminate with respect to colour is a more primitive notion than is that of colour. (Compare the way that in set theory equinumerous is antecedent to number.) Then Smart elucidated the notion of colour in terms of the discriminations with respect to colour of normal human percipients in normal conditions (say cloudy Scottish daylight). This account of colour may be disjunctive and idiosyncratic. (Maxwell's equations might be of interest to Alpha Centaurians but hardly our colour concepts.) Anthropocentric and disjunctive they may be, but objective none the less. David R. Hilbert (1987) identifies colours with reflectances, thus reducing the idiosyncrasy and disjunctiveness. A few epicycles are easily added to deal with radiated light, the colours of rainbows or the sun at sunset and the colours due to diffraction from feathers. John Locke was on the right track in making the secondary qualities objective as powers in the object, but erred in making these powers to be powers to produce ideas in the mind rather than to make behavioural discriminations. (Also Smart would say that if powers are dispositions we should treat the secondary qualities as the categorical bases of these powers, e.g. in the case of colours properties of the surfaces of objects.) Locke's view suggested that the ideas have mysterious qualia observed on the screen of an internal mental theatre. However to do Locke justice he does not talk in effect of red ideas but of ideas of red. Philosophers who elucidate is red in terms of looks red have the matter the wrong way round (Smart 1995).
Let us return to the issue of us having a yellow, purple and green striped sense datum or mental image and yet there being no yellow, purple and green striped thing in the brain. The identity theorist (Smart 1959) can say that sense data and images are not real things in the world: they are like the average plumber. Sentences ostensibly about the average plumber can be translated into, or elucidated in terms of, sentences about plumbers. So also there is having a green sense datum or image but not sense data or images, and the having of a green sense datum or image is not itself green. So it can, so far as this goes, easily be a brain process which is not green either.
Thus Place (1956, p. 49):
When we describe the after-image as green... we are saying that we are having the sort of experience which we normally have when, and which we have learned to described as, looking at a green patch of light.and Smart (1959) says:
When a person says I see a yellowish-orange after-image he is saying something like this: "There is something going on which is like what is going on when I have my eyes open, am awake, and there is an orange illuminated in good light in front of me".Quoting these passages, David Chalmers (1996, p. 360) objects that if something is going on is construed broadly enough it is inadequate, and if it is construed narrowly enough to cover only experiential states (or processes) it is not sufficient for the conclusion. Smart would counter this by stressing the word typically. Of course a lot of things go on in me when I have a yellow after image (for example my heart is pumping blood through my brain). However they do not typically go on then: they go on at other times too. Against Place Chalmers says that the word experience is unanalysed and so Place's analysis is insufficient towards establishing an identity between sensations and brain processes. As against Smart he says that leaving the word experience out of the analysis renders it inadequate. That is, he does not accept the topic-neutral analysis. Smart hopes, and Chalmers denies, that the account in terms of typically of saves the topic-neutral analysis. In defence of Place one might perhaps say that it is not clear that the word experience cannot be given a topic neutral analysis, perhaps building on Farrell (1950). If we do not need the word experience neither do we need the word mental. Rosenthal (1994) complains (against the identity theorist) that experiences have some characteristically mental properties, and that We inevitably lose the distinctively mental if we construe these properties as neither physical nor mental. Of course to be topic neutral is to be able to be both physical and mental, just as arithmetic is. There is no need for the word mental itself to occur in the topic neutral formula. Mental, as Ryle (1949) suggests, in its ordinary use is a rather grab-bag term, mental arithmetic, mental illness, etc. with which an identity theorist finds no trouble.
My argument is this: The definitive characteristic of any (sort of) experience as such is its causal role, its syndrome of most typical causes and effects. But we materialists believe that these causal roles which belong by analytic necessity to experiences belong in fact to certain physical states. Since these physical states possess the definitive character of experiences, they must be experiences.Similarly, Robert Kirk (1999) has argued for the impossibility of zombies. If the supposed zombie has all the behavioural and neural properties ascribed to it by those who argue from the possibility of zombies against materialism, then the zombie is conscious and so not a zombie.
Thus there is no need for explicit use of Ockham's Razor as in Smart (1959) though not in Place (1956). (See Place 1960.) Lewis's paper was extremely valuable and already there are hints of a marriage between the identity theory of mind and so-called functionalist ideas that are explicit in Lewis 1972 and 1994. In his 1972 (Psychophysical and Theoretical Identifications) he applies ideas in his more formal paper How to Define Theoretical Terms (1970). Folk psychology contains words such as sensation, perceive, belief, desire, emotion, etc. which we recognise as psychological. Words for colours, smells, sounds, tastes and so on also occur. One can regard common sense platitudes containing both these sorts of these words as constituting a theory and we can take them as theoretical terms of common sense psychology and thus as denoting whatever entities or sorts of entities uniquely realise the theory. Then if certain neural states do so too (as we believe) then the mental states must be these neural states. In his 1994 he allows for tact in extracting a consistent theory from common sense. One cannot uncritically collect platitudes, just as in producing a grammar, implicit in our speech patterns, one must allow for departures from what on our best theory would constitute grammaticality.
A great advantage of this approach over the early identity theory is its holism. Two features of this holism should be noted. One is that the approach is able to allow for the causal interactions between brain states and processes themselves, as well as in the case of external stimuli and responses. Another is the ability to draw on the notion of Ramseyfication of a theory. F.P. Ramsey had shown how to replace the theoretical terms of a theory such as the property of being an electron by the property X such that.... so that when this is done for all the theoretical terms, we are left only with property X such that, property Y such that etc. Take the terms describing behaviour as the observation terms and psychological terms as the theoretical ones of folk psychology. Then Ramseyfication shows that folk psychology is compatible with materialism. This seems right, though perhaps the earlier identity theory deals more directly with reports of immediate experience.
The causal approach was also characteristic of D.M. Armstrong's careful conceptual analysis of mental states and processes, such as perception and the secondary qualities, sensation, consciousness, belief, desire, emotion, voluntary action, in his A Materialist Theory of the Mind (1968a) with a second edition (1993) containing a valuable new preface. Parts I and II of this book are concerned with conceptual analysis, paving the way for a contingent identification of mental states and processes with material ones. As had Brian Medlin, in an impressive critique of Ryle and defence of materialism (Medlin 1967), Armstrong preferred to describe the identity theory as Central State Materialism. Independently of Armstrong and Lewis, Medlin's central state materialism depended, as theirs did, on a causal analysis of concepts of mental states and processes. See Medlin 1967, and 1969 (including endnote 1).
Mention should particularly be made here of two of Armstrong's other books, one on perception (1961), and one on bodily sensations, (1962). Armstrong thought of perception as coming to believe by means of the senses (compare also Pitcher 1971). This combines the advantages of Direct Realism with hospitality towards the scientific causal story which had been thought to have supported the earlier representative theory of perception. Armstrong regarded bodily sensations as perceptions of states of our body. Of course the latter may be mixed up with emotional states, as an itch may include a propensity to scratch, and contrariwise in exceptional circumstances pain may be felt without distress. However, Armstrong sees the central notion here as that of perception. This suggests a terminological problem. Smart had talked of visual sensations. These were not perceptions but something which occurred in perception. So in this sense of sensation there should be bodily sensation sensations. The ambiguity could perhaps be resolved by using the word sensing in the context of visual, auditory, tactile and bodily, so that bodily sensations would be perceivings which involved introspectible sensings. These bodily sensations are perceptions and there can be misperceptions as when a person with his foot amputated can think that he has a pain in the foot. He has a sensing having a pain in the foot but the world does not contain a pain in the foot, just as it does not contain sense data or images but does contain havings of sense data and of images.
Armstrong's central state materialism involved identifying beliefs and desires with states of the brain (1968a). Smart came to agree with this. On the other hand Place resisted the proposal to extend the identity theory to dispositional states such as beliefs and desires. He stressed that we do not have privileged access to our beliefs and desires. Like Ryle he thought of beliefs and desires as to be elucidated by means of hypothetical statements about behaviour and gave the analogy of the horsepower of a car (Place 1967). However he holds that the dispute here is not so much about the neural basis of mental states as about the nature of dispositions. His views on dispositions are argued at length in his debate with Armstrong and Martin (Armstrong, Martin and Place, T. Crane (ed.) 1996). Perhaps we can be relaxed about whether mental states such as beliefs and desires are dispositions or are topic neutrally described neurophysiological states and return to what seems to be the more difficult issue of consciousness. Causal identity theories are closely related to Functionalism, to be discussed in the next section. Smart had been wary of the notion of causality in metaphysics believing that it had no place in theoretical physics. However even so he should have admitted it in folk psychology and also in scientific psychology and biology generally, in which physics and chemistry are applied to explain generalisations rather than strict laws. If folk psychology uses the notion of causality, it is no matter if it is what Quine has called second grade discourse, involving the very contextual notions of modality.
Like Lewis and Armstrong, functionalists define mental states and processes in terms of the their causal relations to behaviour but stop short of identifying them with their neural realisations. Of course the term functionalism has been used vaguely and in different ways, and it could be argued that even the theories of Place, Smart and Armstrong were at bottom functionalist. The word functionalist has affinities with that of function in mathematics and also with that of function in biology. In mathematics a function is a set of ordered n-tuples. Similarly if mental processes are defined directly or indirectly by sets of stimulus-response pairs the definitions could be seen as functional in the mathematical sense. However there is probably a closer connection with the term as it is used in biology, as one might define eye by its function even though a fly's eye and a dog's eye are anatomically and physiologically very different. Functionalism identifies mental states and processes by means of their causal roles, and as noted above in connection with Lewis, we know that the functional roles are possessed by neural states and processes. (There are teleological and homuncular forms of functionalism, which I do not consider here.) Nevertheless an interactionist dualist such as the eminent neurophysiologist Sir John Eccles would (implausibly for most of us) deny that all functional roles are so possessed. One might think of folk psychology, and indeed much of cognitive science too, as analogous to a block diagram in electronics. A box in the diagram might be labelled (say) intermediate frequency amplifier while remaining) neutral as to the exact circuit and whether the amplification is carried out by a thermionic valve or by a transistor. Using terminology of F. Jackson and P. Pettit (1988, pp. 381-400) the role state would be given by amplifier, the realiser state would be given by thermionic valve, say. So we can think of functionalism as a black box theory. This line of thought will be pursued in the next section.
Thinking very much in causal terms about beliefs and desires fits in very well not only with folk psychology but also with Humean ideas about the motives of action. Though this point of view has been criticised by some philosophers it does seem to be right, as can be seen if we consider a possible robot aeroplane designed to find its way from Melbourne to Sydney. The designer would have to include an electronic version of something like a map of south-eastern Australia. This would provide the belief side. One would also have to program in an electronic equivalent of go to Sydney. This program would provide the desire side. If wind and weather pushed the aeroplane off course then negative feedback would push the aeroplane back on to the right course for Sydney. The existence of purposive mechanisms has at last (I hope) shown to philosophers that there is nothing mysterious about teleology. Nor are there any great semantic problems over intentionality (with a t). Consider the sentence Joe desires a unicorn. This is not like Joe kicks a football. For Joe to kick a football there must be a football to be kicked, but there are no unicorns. However we can say Joe desires-true of himself "possesses a unicorn" . Or more generally Joe believes-true S or Joe desires-true S where S is an appropriate sentence (Quine 1960, pp. 206-16). Of course if one does not want to relativise to a language one needs to insert or some samesayer of S or use the word proposition, and this involves the notion of proposition or intertranslatability. Even if one does not accept Quine's notion of indeterminacy of translation, there is still fuzziness in the notions of belief and desire arising from the fuzziness of analyticity and synonymy. The identity theorist could say that on any occasion this fuzziness is matched by the fuzziness of the brain state that constitutes the belief or desire. Just how many interconnections are involved in a belief or desire? On a holistic account such as Lewis's one need not suppose that individuation of beliefs and desires is precise, even though good enough for folk psychology and Humean metaethics. Thus the way in which the brain represents the world might not be like a language. The representation might be like a map. A map relates every feature on it to every other feature. Nevertheless maps contain a finite amount of information. They have not infinitely many parts, still less continuum many. We can think of beliefs as expressing the different bits of information that could be extracted from the map. Thinking in this way beliefs would correspond near enough to the individualist beliefs characteristic of folk and Humean psychology.
As far as this goes, at any rate, a functionalist can accept token identities. Functionalists commonly deny type identities. However Jackson, Pargetter and Prior (1982) and Braddon-Mitchell and Jackson (1996) argue that this is an over-reaction on the part of the functionalist. (Indeed they see functionalism as a route to the identity theory.) The functionalist may define mental states as having some state or other (e.g., carbon based or silicon based) which accounts for the functional properties. The functionalist second order state is a state of having some first order state or other which causes or is caused by the behaviour to which the functionalist alludes. In this way we have a second order type theory. Compare brittleness. The brittleness of glass and the brittleness of biscuits are both the state of having some property which explains their breaking, though the first order physical property may be different in the two cases. This way of looking at the matter is perhaps more plausible in relation to mental states such as beliefs and desires than it is to immediately reported experiences. When I report a toothache I do seem to be concerned with first order properties, even though topic neutral ones.
If we continue to concern ourselves with first order properties, we could say that the type-token distinction is not an all or nothing affair. We could say that human experiences are brain processes of one lot of sorts and Alpha Centaurian experiences are brain processes of another lot of sorts. We could indeed propose much finer classifications without going to the limit of mere token identities.
How restricted should be the restriction of a restricted type theory? How many hairs must a bald man have no more of? An identity theorist would expect his toothache today to be very similar to his toothache yesterday. He would expect his toothache to be quite similar to his wife's toothache. He would expect his toothache to be somewhat similar to his cat's toothache. He would not be confident about similarity to an extra-terrestrial's pain. Even here, however, he might expect some similarities of wave form or the like.
Even in the case of the similarity of my pain now to my pain ten minutes ago, there will be unimportant dissimilarities, and also between my pain and your pain. Compare topiary, making use of an analogy exploited by Quine in a different connection. In English country gardens the tops of box hedges are often cut in various shapes, for example peacock shapes. One might make generalizations about peacock shapes on box hedges, and one might say that all the imitation peacocks on a particular hedge have the same shape. However if we approach the two imitation peacocks and peer into them to note the precise shapes of the twigs that make them up we will find differences. Whether we say that two things are similar or not is a matter of abstractness of description. If we were to go to the limit of concreteness the types would shrink to single membered types, but there would still be no ontological difference between identity theory and functionalism.
An interesting form of token identity theory is the anomalous monism of Davidson 1980. Davidson argues that causal relations occur under the neural descriptions but not under the descriptions of psychological language. The latter descriptions use intentional predicates, but because of indeterminacy of translation and of interpretation, these predicates do not occur in law statements. It follows that mind-brain identities can occur only on the level of individual (token) events. It would be beyond the scope of the present essay to consider Davidson's ingenious approach, since it differs importantly from the more usual forms of identity theory.
Suppose that I am riding my bicycle from my home to the university. Suddenly I realise that I have crossed a bridge over a creek, gone along a twisty path for half a mile, avoided oncoming traffic, and so on, and yet have no memories of all this. In one sense I was conscious: I was perceiving, getting information about my position and speed, the state of the bicycle track and the road, the positions and speeds of approaching cars, the width of the familiar narrow bridge. But in another sense I was not conscious: I was on automatic pilot. So let me use the word awareness for this automatic or subconscious sort of consciousness. Perhaps I am not one hundred percent on automatic pilot. For one thing I might be absent minded and thinking about philosophy. Still, this would not be relevant to my bicycle riding. One might indeed wonder whether one is ever one hundred percent on automatic pilot, and perhaps one hopes that one isn't, especially in Armstrong's example of the long distance truck driver (Armstrong 1962). Still it probably does happen, and if it does the driver is conscious only in the sense that he or she is alert to the route, of oncoming traffic etc., i.e. is perceiving in the sense of coming to believe by means of the senses. The driver gets the beliefs but is not aware of doing so. There is no suggestion of ineffability in this sense of consciousness, for which I shall reserve the term awareness.
For the full consciousness, the one that puzzles us and suggests ineffability, we need the sense elucidated by Armstrong in a debate with Norman Malcolm (Armstrong and Malcolm 1962, p. 110). Somewhat similar views have been expressed by other philosophers, such as Savage (1976), Dennett (1991), Lycan (1996), Rosenthal (1996). In the debate with Norman Malcolm, Armstrong compared consciousness with proprioception. In recent conversation he was prepared to say that it is proprioception. A case of proprioception occurs when with our eyes shut and without touch we are immediately aware of the angle at which one of our elbows is bent. That is, proprioception is a special sense, different from that of bodily sensation, in which we become aware of parts of our body. Now the brain is part of our body and so perhaps immediate awareness of a process in or a state of our brain deserves to be called proprioception. Thus the proprioception which constitutes consciousness, as distinguished from mere awareness, is a higher order awareness, a perception of one part of (or configuration in) our brain by the brain itself. Some may sense circularity here. If so let them suppose that the proprioception occurs in an in practice negligible time after the process propriocepted. Then perhaps there can be proprioceptions of proprioceptions, proprioceptions of proprioceptions of proprioceptions, and so on up, though in fact the sequence will probably not go up more than two or three steps. The last proprioception in the sequence will not be propriocepted, and this may help to explain our sense of the ineffability of consciousness. Compare Gilbert Ryle in The Concept of Mind on the systematic elusiveness of I (Ryle 1949, pp. 195-8).
Place has argued that the function of the automatic pilot, to which he refers as the zombie within, is to alert consciousness to inputs which it identifies as problematic, while it ignores non-problematic inputs or re-routes them to output without the need for conscious awareness. For this view of consciousness see Place (1999).
Kripke considers the identity heat = molecular motion, and holds that this is true in every possible world and so is a necessary truth. Actually the proposition is not quite true, for what about radiant heat? What about heat as defined in classical thermodynamics which is topic neutral compared with statistical thermodynamics? Still, suppose that heat has an essence and that it is molecular motion, or at least is in the context envisaged. Kripke says (1980, p. 151) that when we think that molecular motion might exist in the absence of heat we are confusing this with thinking that the molecular motion might have existed without being felt as heat. He asks whether it is analogously possible that if pain is a certain sort of brain process that it has existed without being felt as pain. He suggests that the answer is No. An identity theorist who accepted the account of consciousness as a higher order perception could answer Yes. We might be aware of a damaged tooth and also of being in an agitation condition (to use Ryle's term for emotional states) without being aware of our awareness. An identity theorist such as Smart would prefer talk of having a pain rather than of pain: pain is not part of the furniture of the world any more than a sense datum or the average plumber is. Kripke concludes (p. 152) that the
apparent contingency of the connection between the physical state and the corresponding brain state thus cannot be explained by some sort of qualitative analogue as in the case of heat.Smart would say that there is a sense in which the connection of sensations (sensings) and brain processes is only half contingent. A complete description of the brain state or process (including causes and effects of it) would imply the report of inner experience, but the latter, being topic neutral and so very abstract would not imply the neurological description.
Chalmers (1996) in the course of his exhaustive study of consciousness developed a theory of non-physical qualia which to some extent avoids the worry about nomological danglers. The worry expressed by Smart (1959) is that if there were non-physical qualia there would, most implausibly, have to be laws relating neurophysiological processes to apparently simple properties, and the correlation laws would have to be fundamental, mere danglers from the nomological net (as Feigl called it) of science. Chalmers counters this by supposing that the qualia are not simple but unknown to us are made up of simple proto-qualia, and that the fundamental laws relating these to physical entities relate them to fundamental physical entities. His view comes to a rather interesting panpsychism. On the other hand if the topic neutral account is correct, then qualia are no more than points in a multidimensional similarity space, and the overwhelming plausibility will fall on the side of the identity theorist.
On Chalmers' view how are we aware of non-physical qualia? It has been suggested above that this inner awareness is proprioception of the brain by the brain. But what sort of story is possible in the case of awareness of a quale? Chalmers could have some sort of answer to this by means of his principle of coherence according to which the causal neurological story parallels the story of succession of qualia. It is not clear however that this would make us aware of the qualia. The qualia do not seem to be needed in the physiological story of how an antelope avoids a tiger.
People often think that even if a robot could scan its own perceptual processes this would not mean that the robot was conscious. This appeals to our intuitions, but perhaps we could reverse the argument and say that because the robot can be aware of its awareness the robot is conscious. I have given reason above to distrust intuitions, but in any case Chalmers comes some of the way in that he toys with the idea that a thermostat has a sort of proto-qualia. The dispute between identity theorists (and physicalists generally) and Chalmers comes down to our attitude to phenomenology. Certainly walking in a forest, seeing the blue of the sky, the green of the trees, the red of the track, one may find it hard to believe that our qualia are merely points in a multidimensional similarity space. But perhaps that is what it is like (to use a phrase that can be distrusted) to be aware of a point in a multidimensional similarity space. One may also, as Place would suggest, be subject to the phenomenological fallacy. At the end of his book Chalmers makes some speculations about the interpretation of quantum mechanics. If they succeed then perhaps we could envisage Chalmers' theory as integrated into physics and him as a physicalist after all. However it could be doubted whether we need to go down to the quantum level to understand consciousness or whether consciousness is relevant to quantum mechanics.
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First published: January 12, 2000
Content last modified: September 16, 2000