âHow is it that we experience the world? How is it possible that the environment we live in, the objects we use and see, touch and taste, hear and smell, are both patently out there and simultaneously, it seems, in our heads?â
âToday, then, we have set ourselves a simple task: to review all the ways philosophers have supposed a subject might relate to and become conscious of an object, setting aside once and for all those hypotheses that have clearly failed and asking, is there one approach which has not yet been given due attention? Riccardo believes there is.
âTim Parksâ
âTim Parks: Riccardo, to talk us through this I know you want to propose something you call âthe metaphysical switchboard.â Can you explain?â
âRiccardo Manzotti: Well, at the beginning of any discussion of consciousness there are some fundamental premises to be established that will constrain everything that follows. The metaphysical switchboard will help us get a grasp of those premises and the various directions they lead in.â
âManzotti: So, imagine an old-fashioned switchboard with just two toggle switches. Each time you flick one of those switches you open a path that sends the debate in a different direction. Letâs say the first switch determines whether or not subject and object are to be considered separate, the second whether or not the subject is to be supposed physical.â
âManzotti: Fine. With the first switch on separate, we now have to set the second. If we set it for a subject that is non-physical then we get Descartesâs immaterial, or spiritual subject.â
âscientifically itâs a non-starter, since itâs based on the notion that the subject cannot be an object of scientific enquiry. So we can be forgiven, I think, for paying it no further attention.â
âManzotti: Alas no. All the same, assuming we now flick that second switch to physical, things hardly get much easier. This is the territory, I should say, of modern science from Galileo right up to todayâs neuroscientists. They left the first switch set to keep subject and object separate, but placed the subject in a predetermined place in the physical world, namely the brain, and hence made consciousness a neural process that is inside the head and separate from the physical world it perceives.â
âManzotti: The enactivists toy with the first switch, without actually turning it all the way to not separate. They see that consciousness canât be reduced to a property of the goings-on in the brain, so they start to look outside. But instead of considering the external object as such, they look at our dealings with the object, our handling the object, our manipulating the object, believing that consciousness is a product of the actions we perform. At the end of the day, though, the object remains doggedly separate from the subject who experiences it.â
âParks: Okay, letâs stop playing with that switch and set it determinedly on subject and object not separate. As for the second switch, letâs again start with a subject that is not physical, since I suspect you are going to give that position short shrift.
Manzotti: Yes. This is the territory of Bishop Berkeley and Leibniz in the late seventeenth and early eighteenth centuries. Crudely speaking, they proposed that subject and object become identical, the same thing, but both in a completely non-physical world.â
âParks: In our last conversation you reminded us of Sherlock telling Watson, âwhen you have eliminated the impossible, whatever remains, however improbable, must be the truth.â And I guess weâve reached that point: three of our four pathways have been dismissed, so letâs turn to the last: first switch on not separate, second on physical; that is, subject and object are identicalâthe same thingâand physical. Improbable indeed!â
âManzotti: Letâs forget the voices from the past, wipe the slate clean, and take a really ordinary situation: a person looking at some everyday object, letâs say, an apple.â
âThatâs the example I always use. So, we have a bodyâincluding a brain of course!âand an apple. Nothing esoteric or improbable there. The body, letâs say your body, on the left, the apple on the right, thin air in the middle. What could be simpler? But thereâs still one piece of the jigsaw we havenât placed yetâyour experience, or simply the experience of the apple. Where is that? And what is that? We canât account for it.â
âletâs consider the chief suspects, one by one. Is it the activity of your neurons?â
âParks: Weâve already decided against that. There is nothing applish in the gooey brain, and anyway, we donât experience neurons, we experience the apple.â
âManzotti: So is your experience some movement youâre making in relation to the apple? Some action? Is it your movements that conjure a sort of applishness?â
âParks: Again, weâve already dismissed this, havenât we? Movements, actions, donât seem to have anything in themselves that we can identify with the apple we see. I canât imagine a robot repeating exactly my movements would have the same experiences I have. I think we can let this go.â
âManzotti: Okay, so could our experience of the apple be an amalgam of everything going on between subject and object? Neural processes, retina, optic nerve, molecules of apple, atoms in the molecules, electrons in the atoms, everything?â
âParks: Youâre trying to treat me like a performing dog, Riccardo. You want me to say no, obviously. Instead Iâm tempted to say yes. Why canât consciousness be the whole process?â
âManzotti: Because just as we donât experience neurons, so we donât experience retinas or photons either. Obviously theyâre necessary to the experience of seeing an apple, all the elements of the process are necessary, but theyâre not it, are they?â
âManzotti: The constituent parts are causally necessary the way a pot is necessary to boil pasta, but the pot is not the cooked spaghetti. Nor is the heat source, nor is the water. In the case of the apple, if you list the properties of the process as a whole, they just donât match the properties of the experience. Photons are not applish. The rhodopsin your retina secretes is not applish. And so on.â
âBut meantime what if someone said that the experience was the apple itself? After all, the apple is definitely the most applish thing around. And the only thing that has the properties of an experience of an apple. Itâs round, itâs red, itâs shiny. So why canât the subject, consciousness (but not the body, notice), be identical with the apple, out there where the apple is? Consciousness is not about the apple, consciousness is the apple.â
âParks: Of course, Iâve heard you come up with this argument before, Riccardo. So Iâm not going to pretend to be amazed. But itâs still extremely difficult for me, and for most of our readers it will seem quite mad. Essentially, youâre proposing that my experience of the apple, or any âexternal objectâ is outside my bodyâout there where the object is.â
âManzotti: Right. Experience is physicalâwhat else could it be?âonly it is not the physical object that it is usually assumed to be, our neurons, but another physical object, the apple.â
âWe just have this one, admittedly enormous, conceptual shift: instead of supposing that the senses receive âinputâ and somehow create a second, inner mental world reflecting the outer world, we say that your experience is in the outer world: it is not separate from the physical object you perceive, it is the object.â
âParks: I can see it all seems extremely simple to you, and that youâve somehow convinced yourself itâs true. But I assure you that for most people this idea will seem bizarre and almost mystical. Please answer my previous question, what is the relation between my body and the distant object, which is also, you say, my experience?â
âManzotti: Francis Bacon remarked that âOpportunity makes a thief.â Likewise, we could say that your body offers the opportunity or physical conditionsâeyes, optic nerve, neurons and so onâthat allow the world to take place as the object we experience.â
âParks: Opportunity makes the object.â
âManzotti: If you like. Of course, the apple conjured up by this opportunity that is your body, the apple you perceiveâis not an absolute apple, itâs not the apple that Galileo supposed was altogether measurable and fixed, nor Kantâs noumenon, the apple in itself that can never be known; itâs not an apple in an X-ray machine, nor a slice of apple under an atomic microscope. The apple that you experience is simply a selection, or subset, of the many other things going on out there in the world; it is the selection that your bodyâyour brain plus your sense organsâallow for.â
âPark: A relative apple.â
âMazotti: Right. Itâs relative to your body, though of course, since most humans have similar perceptive equipment we will tend to agree on shape and color, up to a point, depending on our eyesight, our position, and so on.â
âOther animals or other devices will allow for other selections and hence other object experiences, which are equally relative and equally real.â
âYour apple is not a snailâs apple. Or a batâs. Your apple is made of those and only those physical features that cause effects thanks to your sensory organs, your particular body.â
âWhich is not to say that other properties do not exist. They do. Itâs just theyâre not part of the object that you experience; to wit, one side of a shiny red round apple.â
âParks: So I am the apple.â
âManzotti: Of course that sounds absurd, because you identify your conscious self, the subject, the I, with your body, and your body is clearly not the apple. But what if I were to say that the very idea of consciousness was invented to explain how you could experience an apple when there is no apple in your head. So we have to have this consciousness apple. However, if experience and apple are one and the same, there is no longer any need to talk of a consciousness separate from it. The apple is more than enough.â
âParks: Youâre really going to say I am the appleâŚ.â
âManzotti: You are a whole range of experiences, hundreds and hundreds of things going on simultaneously, of which the apple is one. Thatâs why when you close your eyes, the apple disappears. Eyes closed, your body no longer offers the conditions for the apple to have certain effects. Consequently the apple with its shape and colors is no longer part of your experience.â
âParks: But I know itâs still there! I could reach out and touch the apple, eyes closed.â
âManzotti: You could indeed! But it will not be the same apple as your visual apple. It will be a smooth solid rotundity.â
âA blind manâs apple. And that apple too will be in the external world and not inside your hand. This âtouch apple,â if I can call it that, originates in the same external conditions, but a different set of physical features is now selected.â
âAgain the object is relative to the body, or the parts of the body, involved in the experience. Itâs like the difference between feeling for something inside a drawer as compared to looking inside a drawer. Different experiences, different objects. None of them in your head, but out there, where you experience them.â
âParks: So, what youâre claiming if Iâm not mistaken is that for every experience there must be an external object which is identical with it. And frankly that is not going to be an easy sell.â
âPeople will laugh you out of town. What about memories, they will say? My memory of the apple. What about dreams? What about hallucinations? And thoughts, words, cogitation, pain, heat, and cold. Where is the external object that corresponds to these aspects of experience? Your idea is dead in the water.â
âManzotti: By all means, bring the objections on. Iâm ready for them. All I ask is a little time and space. You canât turn round an oil tanker on a dime. Weâll tackle these challenges, which are substantial and serious, in our next talk.â
âBut let me just say in closing that this is not simply philosophical speculation, but a concrete empirical hypothesis. Itâs a risky hypothesis, I know, but didnât Karl Popper define scientific hypotheses as inevitably risky, daring proposals open to being proved or disproved?â
âParks: Which you believe this is?â
âManzotti: Eminently.â
âThis is the fifth in a series of conversations on consciousness between Riccardo Manzotti and Tim Parks.â
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