Hilary Putnam: Reason, Truth and History. New York: Cambridge University Press, 1981.
Descartes’s Evil Genius reappears in Hilary Putnam’s Evil Scientist, who creates the world of the brains in a vat, beings who trust—but should not trust—their own ‘senses,’ which are in fact artificial creations of the Evil Scientist. Like Descartes, like Machiavelli, Putnam argues for a new epistemology and a new morality. He wants an epistemology that synthesizes ‘objective’ and ‘subjective,’ a morality that synthesizes ‘fact’ and ‘value.’ Can he do that, without merely rehabilitating Hegelian historicism? Or is that what he wants to do?
Or does he want to follow Plato? Without ‘synthesizing’ subjects and objects, the Platonic dialogue does bring them into coordination, although philosophers who fail to respect literary genre never see this. The dialogue is just that: someone make every argument to someone else. Two ‘subjects’ speak and listen to one another, about some ‘object’ or topic, and to some end or purpose. It is Descartes who veers from realism. ‘I think, therefore I am’ is every bit as dialogic as ‘Do you see, Glaucon…?’ Talking to yourself does not escape the ‘doubleness’ of thought. That fact forms the foundation of political philosophy.
Intentionality underlies representation, Putnam observes, rather Platonically. An isolated mental representation loses its intended meaning; show a tree to someone who’s never left the Sahara, and who knows what it might represent to him? “Thought words and mental pictures do not intrinsically represent what they are about” (5).
Hence the problem of brains in a vat. Descartes’s evil genius may have created the world in which we are nothing but brains in a vat, our minds ‘seeing’ artificial images fed in through artificial senses—rather like Plato’s prisoners in the Cave of opinion, but in a place much harder to get out of. Our sensually ‘self-evident’ data are false, but we have no way of knowing this. We can say all the things human beings say (at least if our brains are hooked with some device that enables us to vocalize), but they cannot refer to the things human beings refer to. To refer, a sentence or thought must have to do with the real world. A being comprehensively fooled has no effective intelligence in either the Platonic sense of noēsis or the Machiavellian sense of grasping.
If brains in a vat chorus, ‘We are brains in a vat,’ they’ve hit upon the truth randomly, like chimps typing Coriolanus. Putnam goes so far as to say that this randomly true statement is false, when said by the poor brains. He wants to avoid a God’s-Eye absolutism—which, unfortunately, his own audience, and indeed his creator-god evil scientist, cannot help but supply, and therefore to conceive of themselves similarly. The less dramatic way to proceed is the Socratic way: I begin with sense perceptions and opinion. I have various ways to test them; chief among these is the principle of non-contradiction, which is mentally and physically inescapable in certain ways. The results of my testing may eventually take me very far afield from opinion and even from sense perception: a theory of ideas, quantum physics. Those far-afield theories nonetheless play out in the world of commonsense (sense perceptions + opinions), and can be corroborated sensually and ‘conceptually.’ (After hearing so much about the non-sensuality of modern physics, according to physicists who know a lot more math than I do, I am always entertained by their joy in announcing experiments that confirm empirically some theory worked out on paper, a century back.)
The claim that ‘concepts’ are “mental presentations” that do not “necessarily refer to external things” is, then, not entirely true. Concepts are mental presentations that necessarily refer to external things: the vat-brains’ ‘tree’ is the result of an external stimulus, provided by a real evil scientist, rather as the cave-dwellers image is the result of being shown an image by the opinion makers of the polis. Such mental presentations are false, a matter of some cunning artifice or convincing natural illusion, which are external though deceptive. Philosophers are wisdom-lovers who test whether the unassisted human mind can sift through commonsense impressions to determine if they are part of a larger whole or ‘nature.’
Putnam sensibly writes, “the whole problem we are investigating is how representations can enable us to refer to what is outside the mind” (27). Putnam rejects the neo-Machiavellian or Kantian claim that one should make a priori impositions on the world, call them “theoretical constraints,” and then test them. This “does not work!” he exclaims (32). You still need reference. ‘The cat is on the mat’ doesn’t mean ‘the cat is on the mat’ if by ‘cat’ I mean ‘cherries.’
Putnam also tries to dispose of a ‘Darwinian’ approach to epistemology—this one objectivist, not subjectivist. According to evolutionism, if our mental representations did not correspond to externals, we would perish. There is truth in this argument, Putnam concedes; there must be some correspondence between subject and object, lest objects smash into subjects with extreme prejudice. But this is not too helpful: A pigeon can make his way into New York as readily as I can, if not more so; yet, bird-brain though I may be, it’s clear to humans that humans do not perceive all the same aspects of reality that birds perceive. To this I only add: The correspondence I perceive must be disproved. What I think I see is what I get, as far as I know, until testing proves otherwise. Even a test-refutation may only bring out supplementary dimensions to what I see. Even a ‘paradigm shifting’ series of test (as a conservative Kuhnian conceives of them)—for example, as Einsteinian physics gives Newtonian physics a new frame, without refuting Newtonian physics altogether—confirms rather than disproves my provisional but strong trust in correspondence. (Putnam’s Kuhn, by contrast, is a thinker of “extreme relativism” [113].)
Putnam’s basic point looks sound. Believing and intending presuppose the ability to refer, but we need something more than naïve correspondence theory to know, or at least know more, about what it is we refer to. As for his dismissal of “metaphysical realism,” or “the externalist perspective” (49 ff.), it runs into a problem. First, if the world does not “consist of some fixed”—or why not changing?—”totality of mind-independent objects,” what was the world before minds of some sort came into it? Far from assuming a “God’s Eye point of view” (50), metaphysical realism accepts a world with or without minds. Further, while there may be no God’s Eye point of view “that we can know or usefully imagine” (emphasis added), this does not mean that the God’s Eye view cannot be theoretically valid. The problem with the God’s Eye view is the problem Gnostics propose: Maybe there are gods behind gods, each with his own Eye. But this problem disappears practically if you take the ‘conservative’ view that commonsense is valid until disproved. This does not mean that truth can be “independent of observers altogether if “truth” refers to an interaction of observer and observed. It does mean that there is reality independent of observers altogether—that, for example, the Milky Way would still exist whether or not there was anyone or anything to perceive it. “Truth”—so defined—and possibility are not coterminous. If the world does not send out ‘noetic rays,’ prove it, because that’s what common sense tacitly assumes. The mere raising of doubt proves or disproves nothing. The Cartesian command to doubt everything—insofar as it is not mad—really constitutes a philosopher’s critique of religious belief as a substitute for the workings of the unassisted human mind.
Putnam properly insists that his mixture of subjectivism and objectivism is no “facile relativism” (54)—leaving open whether or not it amount to some infacile relativism. Conceptual systems may be created, he says, but they are not created equal. He rather argues that commonsense “inputs” are “themselves to some extent shaped by our concepts” (54)—something that Socrates would hardly deny, having expended much effort to refine opinions or ‘concepts.’ As noted above, the modern ‘concept,’ stripped of epistemological Machiavellianism or creationism, looks very much like Platonic ‘opinion.’
To put it in Kantian terms, against Kantian theory, we do not know that we do not know the noumenal with respect to the whole. It is very likely, as Socrates says, that we know that we do not know the whole—but this is a Platonic point, not only a Kantian point. Neither Platonism nor Kantianism rules out mistakes. Indeed, Socrates became notorious for pointing them out. That this is a Platonic point, Putnam conspicuously fails to notice, supposing that Kant discovered the limitations off human knowledge. This may be because he speaks in Machiavellian/Kantian terms of grasping forms rather than in Socratic/Platonic terms of seeing them. (The further complication is: Did Socrates/Plato really believe the theory of the forms? But that’s another exegesis.)
Kant “suggested sublimating this ‘totalizing’ impulse [the God’s Eye point of view] in the project of trying to realize ‘the highest good in the world’ by reconciling the moral and empirical orders in a perfected system of social institutions and individual relationship” (74). True enough: and what a mistake! Moralizing Machiavelliansim remains all-too-Machiavellian, resulting in ‘the perpetual war fro perpetual peace’ when it does not result in some tyranny. Socrates sanely prefers to confine the “totalizing impulse” to precisely the realm where it can do the least harm: the city in speech, theory.
Putnam reasonably refutes logical positivism and epistemological relativism. The latter, he sees, is either a sophisticated form of the love of one’s own (120), or a not-so-sophisticated form of mental anarchism that cannot account for its own orderly, if mistaken, arguments. As for moral relativism founded upon Hume’s ‘fact/value’ dichotomy, Putnam wants eudaemonism-cum-Kantian-noumenalism, a position Kant conspicuously rejects. Putnam retains Kantian demi-historicism. Putnam does not give enough argument for me to tell if his deviation from the Kantian path is sustainable. Generally, what he says makes sense: ‘reasonable’ with respect to morality isn’t the same as ‘reasonable’ in math or science, as Socrates knows. Putnam needs some notion of prudence, but perhaps a vestigial Kantianism prevents him from developing one? He tends to reduce prudential reasoning to utilitarianism, very much as Kant tends to do. At the same time, Putnam wants a more flexible mode of reasoning than scientists will allow.
He is more concerned with showing the influence of conceptual frameworks on ‘values’ and ‘facts.’ “Today we tend to be too realistic about physics and too subjectivistic about ethics” (143); fair enough, but you need prudence to make such judgments, absent a God’s-Eye point of view. Otherwise, how can one speak ironically of physics as the One True Theory? Maybe it is only the wrong One True Theory. That is at least as possible as being a brain in a vat. To see the irreducibility of ethics to physics (145)—an Aristotelian point—one needs some common scale of comparison. As a result of this quandary, Putnam comes to a pluralist, tolerate-only-intolerance account of political philosophy (149), the inadequacy of which can be seen in the fact that citizens must not only tolerate but defend one another. ‘I tolerate you’ is too weak to serve alone as a bond of citizenship.
Putnam moves toward this realization in his seventh chapter, where he observes that “there are better grounds for criticizing cultural imperialism than the denial of objective values” (162), and that Plato and the medieval philosophers did not “conceive of experience as morally and politically neutral” (154-155). Modern rationalism/instrumentalism, coming out of Machiavelli’s radical instrumentalism, may or may not be majoritarian (as Putnam claims); it is only if the majority really is stronger than some elite. Still, the general critique of instrumentalism Putnam offers is sound. Instrumental rationalism does tend toward ‘might makes right,’ and, as that longtime ‘friend of the forms’ Michael Platt once wrote, it cannot tell us why it is reasonable to call the Tropiques “Tristes.” Scientific method “presupposes prior notions of rationality” (195); it does not exhaust them.
As Putnam concludes, the ‘fact/value’ dichotomy presupposes a mindless, an unteleological nature. But human beings are themselves part of nature. “The choice of a conceptual scheme is what cognitive rationality is all about” (212), but in order for the choice to be a choice—to be non-arbitrary—there must be some distinction between any existing conceptual scheme—’epistemological’ or ‘moral,’ insofar as those may be distinguished—and the act of choosing. That “presupposes our theory of the good,” including assumptions about human nature, society, and the universe (215). Socrates concurs.
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