Maverick Philosopher: Strictly Philosophical

A Curious Extrapolation

The old man's libido on the wane, he thinks more clearly and more truly about sexual matters.  And when the waning of all his physical forces and endowments reaches its term -- will he then think best of all, or not at all?

The dove soars through the air  and imagines it could soar higher and with less effort if there were no air to offer resistance.  But the dove is mistaken.  The dove on the wing does not understand the principle of the wing, Bernoulli's principle.  Are we like the dove? The dove needs the air to fly.  Do we need the body to think?  Is the body necessary for thought?  Pascal says that our whole dignity consist in thought.  Is our dignity tied of necessity to the flesh ?

Or are we like the rocket whose propulsion has nothing to do with wings, the rocket the  principle of whose propulsion is Newton's Third Law of Motion: To every action there is an equal but opposite reaction?

A curious extrapolation and a strange analogy.

The Problem of Consciousness and Galen Strawson's Non-Solution

The problem can be set forth in a nice neat way as an aporetic triad:

1) Consciousness is real; it is not an illusion.

2) Consciousness is wholly natural, a material process in the brain.

3) It is impossible that conscious states, whether object-directed or merely qualitative, be material in nature.

It is easy to see that the members of this triad are collectively inconsistent: they cannot all be true.  Any two of the propositions, taken together, entails the negation of the remaining proposition.  

And yet each limb of the triad has brilliant defenders and brilliant opponents. So not only is consciousness itself a mighty goad to inquiry; the wild diversity of opinions about it is as well.  (The second goad is an instance of what I call the Moorean motive for doing philosophy: G. E. Moore did not get his problems from the world, but from the strange and mutually contradictory things philosophers said about the world, e.g., that time is unreal (McTaggart) or that nothing is really related (Bradley).)

The above problem is soluble if a compelling case can be made for the rejection of one of the limbs.  But which one? Eliminativists reject (1); dualists of all types, and not just substance dualists, reject (2); materialists reject (3).  

I agree with Strawson that eliminativism has zero credibility.  (1) is self-evident and the attempts to deny it are easily convicted of incoherence.  So no solution is to be had by rejecting (1).

As for (2), it is overwhelmingly credible to most at the present time.  We live in a secular age.  'Surely' -- the secularist will assure us -- there is nothing concrete that is supernatural.  God and the soul are just comforting fictions from a bygone era. The natural exhausts the real.  Materialism about the mind is just logical fallout from naturalism.  If all that (concretely) exists is space-time and its contents, then the same goes for minds and their states.

Strawson, accepting both (1) and (2) must reject (3).  But the arguments against (3), one of which I will sketch below, are formidable. The upshot of these arguments is that it is unintelligible how either qualia or intentional states of consciousness could be wholly material in nature.  Suppose I told you that there is a man who is both fully human and fully divine. You would say that that makes no sense, is unintelligible, and is impossible for that very reason. Well, it is no less unintelligible that a felt sensation such as my present blogger's euphoria be identical to a state of my brain.  

What could a materialist such as Strawson say in response? He has to make a mysterian move. 

He could say that our understanding of matter at present does not allow us to understand how conscious experience could be wholly material in nature, but that it is nevertheless wholly material in nature! Some matter is sentient and some matter thinks. My euphoria is literally inside my skull and so are my thoughts about Boston. 

(Compare the orthodox Chalcedonian incarnationalist who says that the man Jesus of Nazareth is identical to the Second Person of the Trinity. Put him under dialectical pressure and he might say, "Look it is true! We know it by divine revelation. And what is true is true whether or not we can understand how it is possible that it be true. It must remain a mystery to us here below.)

Or a materialist mysterian  can say that our understanding of matter will never allow us to understand how conscious experience could be wholly material in nature.  Either way, conscious experience, whether intentional or non-intentional, is wholly material in nature, and falls entirely within the subject-matter of physics, whether a future physics achievable by us, or a physics which, though not achievable by us, is perhaps achievable by organisms of a different constitution who study us.

If I understand Galen Strawson's view, it is the first.  Conscious experience is fully real but wholly material in nature despite the fact that on current physics we cannot account for its reality: we cannot understand how it is possible for qualia and thoughts to be wholly material.   Here is a characteristic passage from Strawson: 

Serious materialists have to be outright realists about the experiential. So they are obliged to hold that experiential phenomena just are physical phenomena, although current physics cannot account for them.  As an acting materialist, I accept this, and assume that experiential phenomena are "based in" or "realized in" the brain (to stick to the human case).  But this assumption does not solve any problems for materialists.  Instead it obliges them to admit ignorance of the nature of the physical, to admit that they don't have a fully adequate idea of what the physical is, and hence of what the brain is.  ("The Experiential and the Non-Experiential" in Warner and Szubka, p. 77)

Strawson and I agree on two important points.  One is that what he calls experiential phenomena are as real as anything and cannot be eliminated or reduced to anything non-experiential. Dennett denied! The other is that there is no accounting for experiential items in terms of current physics.

I disagree on whether his mysterian solution is a genuine solution to the problem. What he is saying is that, given the obvious reality of conscious states, and given the truth of naturalism, experiential phenomena mustbe material in nature, and that this is so whether or not we are able to understand how it could be so.  At present we cannot understand how it could be so. It is at present a mystery. But the mystery will dissipate when we have a better understanding of matter.

This strikes me as bluster.

An experiential item such as a twinge of pain or a rush of elation is essentially subjective; it is something whose appearing just is its reality.  For qualia, esse = percipi.  If I am told that someday items like this will be exhaustively understood from a third-person point of view as objects of physics, I have no idea what this means.  This is an empty gesturing toward an inconceivable 'possibility.' We are being told in effect that what is essentially subjective will one day be exhaustively understood as both essentially subjective and wholly objective.  And that makes no sense. If you tell me that understanding in physics need not be objectifying understanding, I don't know what that means either.

As Strawson clearly appreciates, one cannot reduce a twinge of pain to a pattern of neuron firings, for such a reduction eliminates the what-it-is-like-ness  of the experience.  And so he inflates the concept of the physical to cover both the physical and the mental.  But by doing this he drains the physical of definite meaning.  His materialism is a vacuous materialism. We no longer have any idea of what 'physical' means if it no longer contrasts with 'mental.'

If we are told that sensations and thoughts are wholly material, we have a definite proposition only if 'material' contrasts with 'mental.' But if we are told that sensations and thoughts are material, but that matter in reality has mental properties and powers, then I say we are being told  nonsense.  We are being handed  grammatically correct sentences that do not express a coherent thought.

Besides, if some matter in reality senses and thinks, surely some matter doesn't; hence we are back to dualism.

Why is Strawson's  mysterianism any better than Dennett's eliminativism?  Both are materialists. And both are keenly aware of the problem that qualia pose.  This is known in the trade as the 'hard problem.' (What? The other problems in the vicinity are easy?) The eliminativist simply denies the troublesome data. Qualia don't exist! They are illusory!  The mysterian materialist cannot bring himself to say something so manifestly silly. But, unwilling to question his materialism, he says something that is not much better. He tells us that qualia are real, and wholly material, but we don't understand how because we don't know enough about matter.  But this 'theological' solution is also worthless because no definite proposition is being advanced.

Strawson frankly confesses, "I am by faith a materialist." (p. 69)  Given this faith, experiential items, precisely as experiential, must be wholly material in nature.  This faith engenders the hope that future science will unlock the secret.  Strawson must pin his hope on future science because of his clear recognition that experiential items are incomprehensible in terms of current physics.

But what do the theological virtues of faith and hope have to do with sober inquiry?  It doesn't strike me as particularly  intellectually honest to insist that materialism just has to be true and to uphold it by widening the concept of the physical to embrace what is mental.  It would be more honest just to admit that the problem of consciousness is insoluble.

And that is my 'solution.' The problem is real, but insoluble by us.

Strawson's latest banging on his mysterian materialist drum is to be found in The Consciousness Deniers in The New York Review of Books.

Memory, Memory Traces, and Causation

Passing a lady in the supermarket I catch a whiff of patchouli.  Her scent puts me in mind of hippy-trippy Pamela from the summer of '69.  An olfactory stimulus in the present causes a memory, also in the present, of an event long past, a tête-à-tête with a certain girl.  How ordinary, but how strange! Suddenly I am 'brought back' to the fabulous and far-off summer of '69.  What is memory and how does it work?  How is it even possible? 

Let's start with the 'datanic' as I like to say:

1. There are (veridical) memories through which we gain epistemic access to the actual past, to events that really happened.  The above example is a case of episodic personal memory.  I remember an event in my personal past.  To be precise, I remember my having experienced an event in my personal past.  My having been born by Caesarean section is also an episode from my personal past, and I remember that that was my mode of exiting my mother's body; but I don't remember experiencing that transition.  So not every autobiographical memory is a personal episodic memory.  The latter is the only sort of memory I will be discussing in this post.  The sentence in boldface is the nonnegotiable starting point of our investigation. 

We now add a couple of more theoretical and less datanic propositions, ones which are not obvious, but are  plausible and accepted by many theorists:

2. Memory is a causal notion.  A mental image of a past event needn't be a memory of a past event.  So what makes a mental image of a past event a memory image?  Its causal history.  My present memory has a causal history that begins with the event in 1969 as I experienced it.

3. There is no action at a temporal distance.  There is no direct causation over a temporal gap.  There are no remote causes; every cause is a proximate cause.  A necessary ingredient of causation is spatiotemporal contiguity.  So while memory is a causal notion, my present memory of the '69 event is not directly caused by that event.  For how could an event that no longer exists directly cause, over a decades-long temporal gap, a memory event in the present?  That would seem to be something 'spooky,' a kind of magic. 

Each of these propositions lays strong claim to our acceptance.  But how can they all be true?  (1) and (2) taken together appear to entail the negation of (3).  How then can we accommodate them all?

Memory trace theories provide a means of accommodation.  Suppose there are memory traces or engrams engraved in some medium.  For materialists this medium will have to be the brain.  One way to think of a memory trace is as a brain modification that was caused at the time of the original experience, and that persists since that time.  So the encounter with Pam in '69 induced a change in my brain, left a trace there, a trace which has persisted since then.  When I passed the patchouli lady in the supermarket, the olfactory stimulus 'activated' the dormant memory trace.   This activation of the memory trace either is or causes the memory experience whose intentional object is the past event.  With the help of memory traces we get causation wthout action at a temporal distance. 

(Far out, man!)

The theory or theory-schema just outlined seems to allow us to uphold each of the above propositions. In particular, it seems to allow us to explain how a present memory of a past event can be caused by the past event without the past event having to jump the decades-long temporal gap between event remembered and memory.  The memory trace laid down in '69 by the original experience exists in the present and is activated in the present by the sensory stimulus.  Thus the temporal contiguity requirement is satisfied.  And if the medium in which the memory traces are stored is the brain or central nervous system, then the spatial contiguity requirement is also satisfied.

Question:  Could memory traces play merely causal roles?

Given (2) and (3), it seems that memory traces must be introduced as causal mediators between past and present.  But could they be just that?  Or must they also play a representational role?  Intuitively, it seems that nothing could be a memory trace unless it somehow represented the event of which it is a trace. If E isthe original experience, and T is E's trace, then it it seems we must say that T is of E in a two-fold sense corresponding to the difference between the subjective and objective genitive.  First, T is of E in that T is E's trace, the one that E caused. Second, T is of E in that T represents E. 

It seems obvious that a trace must represent.  In my example,the sensory stimulus (the whiff of patchouli) is not of or about the '69 event.  It merely activates the trace, rendering the dispositional occurrent.  But the memory is about the '69 event.  So the aboutness must reside in the trace.  The trace must represent the event that caused it  -- and no other past event.  The memory represents because the trace represents.  If the trace didn't represent anything, how could the memory -- which is merely the activation of the trace or an immediate causal consequence of the activation of the trace -- represent anything?  How a persisting brain modification -- however it is conceived, whether it is static or dynamic, whether localized or nonlocalized -- can represent anything is an important and vexing question but one I will discuss in a later post.

Right now I want to nail down the claim that memory traces cannot play a merely causal role, but must also bear the burden of representation.

Suppose a number of strangers visit me briefly.  I want to remember them,  but my power of memory is very weak and I know I will not remember them without the aid of some mnemonic device.  So I have my visitors leave calling cards.  They do so, except that they are all the same, and all blank (white).  These blank cards are their traces, one per visitor.   The visitors leave, but the cards remain behind as traces of their visit.  I store the cards in a drawer.  I 'activate' a card by pulling it out of storage and looking at it.  I am then reminded (at most) that I had a visitor, but not put in mind of any particular visitor such as Tom.  So even if the card in my hand was produced by Tom, that card is useless for the purpose of remembering Tom.  Likewise for every other card.  Each was produced by someone in particular and only by that person; but none of them 'bring back' any particular person. 

Bear in my mind that I don't directly remember any of my visitors.  My only memory access to them is via their traces, their calling cards.  For the visitors are long gone just like the '69 experience.  So the problem is not merely that I don't know which card is from which person; the problem is that I cannot even distinguish the persons.  

Had each visitor left a differently  colored card, that would not have helped.  Nor are matters helped if each visitor leaves a different sort of trace; a bottle cap, a spark plug, a lock of hair, a guitar pick.  Even if  Tom is a guitar player and leaves a guitar pick, that is unhelpful too  since I have no access to Tom except via his trace. 

So it doesn't matter whether my ten visitors leave ten tokens of the same type, or ten tokens each of a different type.  Either way I won't be able to remember them via the traces they leave behind.  Clearly, what I need from each visitor is an item that uniquely represents him or her -- as opposed to an item that is merely caused to be in my house by the visitor.  Suppose Tom left a unique guitar pick, the only one of its kind in existence.  That wouldn't help either since no inspection of that unique pick could reveal that it was of Tom rather than of Eric or Eric's cat.  Ditto if Tom has signed his card or his pick 'Tom Riff.'  That might be a phony name, or the name of him and his guitar -- doesn't B. B . King call his guitar 'Lucille'?

If I can remember that it was Tom who left the guitar pick, then of course I don't need the guitar pick to remember Tom by.  I simply remember Tom directly without the need for a trace.  On the other hand, if I do need a trace in order to remember long gone Tom, then that trace must have representational power: it cannot be merely something that plays a causal role. 

Traces theories have to avoid both circularity and vicious infinite regress.

Circularity.  To explain the phenomenon of memory, the trace theory posits the existence of memory traces.  But if the explanation in terms of traces ends up presupposing memory, then the theory is circular and worthless.  If what makes the guitar pick a trace of Tom is that I remember that Tom left it, then the explanation is circular.  Now consider the trace T in my brain which, when activated by stimulus S causes a memory M of past experience E.  M represents E because T represents E.  What makes T represent E? What makes the memory trace caused by the encounter with Pam in '69 represent Pam or my talking with her?  The answer cannot be that I remember the memory trace being caused by the encounter with Pam.  For that would be blatantly circular.  Besides, memory traces in the brain are not accessible to introspection.

Infinite Regress.  Our question is: what makes T represent E and nothing else?  To avoid circularity one might say this:  There is a trace T* which records the fact of E's production of T, and T represents E in virtue of T*.  But this leads to a  vicious infinite regress.   Suppose Sally leaves a photo of herself.  How do I know that the photo is of Sally and not of her sister Ally?  If you say that I directly remember Sally and thereby know that the photo is unambiguously of her, then you move in a circle.  You may as well just say that we remember directly and not via traces.  So, to hold onto the trace theory, one might say the following:  There is a photo of Sally and a photo of her photograph, side by side.  Inspection of  this photo reveals that the first photo is of Sally.  But this leads to regress:  what makes the second photo a photo of the first?

Conclusion:  To avoid both circularity and infinite regress, memory traces must possess intrinsic representational power.  Their role cannot be merely causal.

A later post will then address the question whether memory traces could have intrinsic representational power.  If you are a regular reader of this blog you will be able to guess my answer, namely, that nothing of a merely material nature has intrinsic representational power.

REFERENCE:  John Heil, "Traces of Things Past," Philosophy of Science, vol. 45, no. 1 (March 1978), pp. 60-72.  My calling card example above is a reworking of Heil's tennis ball example.

On the Status of Thomistic Common Natures

Thomas Aquinas says that any given nature can be considered in three ways: (i) in respect of the esse it has in concrete singulars; (ii) in respect of the esse it has in minds; (iii) absolutely, in the abstract, without reference to either material singulars or minds, and thus without reference to either mode of esse.  The two modes are esse naturale (esse reale) and esse intentionale.  We can speak of these in English as real existence (being) and intentional existence (being).  Real existence is existence 'outside' the (finite) mind. Intentional existence is existence 'in' or 'before' the mind.  The mentioned words are obviously not to be taken spatially.  Esse is the Latin infinitive, to be.  Every human mind is a finite mind, but don't assume the converse.

According to Schopenhauer, the medievals employed but three examples: Socrates, Plato, and an ass.  Who am I to deviate from a tradition at once so hoary and noble?  So take Socrates.  Socrates is human.  The nature humanity exists really in him, and in Plato, but not in the ass.  The same nature exists intentionally in a mind that thinks about or knows Socrates.  For Aquinas, there are no epistemic deputies standing between mind and thing: thought reaches right up to and grasps the thing itself.   There is an isomorphism between knowing mind and thing known. 

The ground of this isomorphism is the natura absoluta, the nature considered absolutely.  Call it the common nature (CN).  It is so-called because it is common to both the knower and the known, informing both, albeit in different ways.  It is also common to all the  singulars of the same nature and all the thoughts directed to the same sort of thing.  So caninity is common to all doggy thoughts, to all dogs, besides linking the doggy thoughts to the dogs.

Pause to appreciate how attractive this conception is. It secures the intrinsic intelligibility of the world while avoiding the 'gap problem' that bedevils post-Cartesian thought. Surely the world is intrinsically intelligible; it is not intelligible in virtue of our imposition of conceptual schemes.

I need to know more, however, about  the exact ontological status of the common nature (CN) which is, as it were, amphibious as between knowing mind and thing known. 

With the help of Anthony Kenny, I realized that there are four possible views, not three as I stated in earlier forays:

A. The CN really exists as a separate, self-subsistent item.

B. The CN exists only intentionally in the mind of one who abstracts it from concrete extramental singulars and mental acts.  (Note: a mental act is a concrete singular because in time, though not in space.)

C. The CN has Meinongian Aussersein status: it has no mode of being whatsoever, and yet is is something, not nothing.  It actually has properties, it does not merely possibly have them, but is property-incomplete (and therefore in violation of the Law of Excluded Middle) in that it is neither one nor many, neither universal nor particular, neither intentionally existent nor really existent.

D. The CN exists intentionally in the mind of God, the creator.

(A) is a nonstarter and is rejected by both me and Lukas Novak.  (B) appears to be Novak's view.  (C) is the interpretation I was tentatively suggesting in earlier entries..  My thesis was that the CN must have Aussersein status, but then it inherits -- to put it anachronistically -- all the problems of Meinongianism.  The doctor angelicus ends up in the jungle with a  Meinongian monkey on his back.  

Let me now try to explain why I reject (B), Novak's view, and incline toward (C), given that (A) cannot possibly be what Aquinas had in mind. 

Consider a time t before there were any human animals and any finite minds, and ask yourself: did the nature humanity exist at t?  The answer has to be in the negative if there are only two modes of existence, real existence in concrete extramental singulars and intentional existence in finite (creaturely) minds.  For at t there were no humans and no finite minds.  But surely it is true at t that man is rational, that humanity includes rationality.  This implies that humanity at t cannot be just nothing at all.  For if it were nothing at all at t, then 'Man is rational' at t would lack a truth-maker.  Furthermore, we surely don't want to say that 'Man is rational' first becomes true when the first human being  exists.  In some sense, the common nature must be prior to its existential realization in concrete singulars and in minds.  The common nature cannot depend on these modes of realization.  Kenny quotes Aquinas (Aquinas on Being, Oxford 2002, p. 73):

Socrates is rational, because man is rational, and not vice versa; so that even if Socrates and Plato did not exist, rationality would still be a characteristic of human nature.

Socrates est rationalis, quia homo est rationalis, et non e converso; unde dato quod Socrates et Plato non essent, adhuc humanae naturae rationalitas competeret. (Quodl. VIII, I, c, 108-110)

Aquinas' point could be put like this.  (i) At times and in possible worlds in which humans do not exist, it is nevertheless the case that rationality is included in humanity, and (ii)  the metaphysical ground of humans' being rational is the circumstance that rationality is included in humanity, and not vice versa.

Now this obviously implies that the common nature humanity has some sort of status independent of real and intentional existence.  So we either go the Meinongian route or we say that comon natures  exist in the mind of God.  Kenny:

Aquinas' solution is to invoke the divine mind.  There are really four, not three ways of considering natures: first, as they are in the mind of the creator; second, as they are in the abstract; third, as they are in individuals; and finally, as they are in the human mind. (p. 74)

This may seem to solve the problem I raised.  Common natures are not nothing because they are divine accusatives.  And they are not nothing in virtue of being ausserseiend. This solution avoids the three options of Platonism, subjectivism (according to which CNs exist only as products of abstraction), and Meinongianism.

The problem with the solution is that it smacks of deus ex machina: God is brought in to solve the problem similarly as Descartes had recourse to the divine veracity to solve the problem of the external world.  Solutions to the problems of universals, predication, and intentionality ought to be possible without bringing God into the picture.  

I  think about deus ex machina objections in philosophy in Deus ex Machina: Leibniz Contra Malebranche.

But if we don't bring God into the picture then we may face a trilemma:  either Platonism, or subjectivism, or Meinongianism.

Once again, intellectual honesty bring us to aporia.