Varieties of Contextualism: Standards and Descriptions1 Peter Baumann
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Varieties of Contextualism: Standards and Descriptions1 Peter Baumann University of Aberdeen Summary Most contextualists agree that contexts differ with respect to relevant epis- temic standards. In this paper, I discuss the idea that the difference between more modest and stricter standards should be explained in terms of the close- ness or remoteness of relevant possible worlds. I argue that there are serious problems with this version of contextualism. In the second part of the paper, I argue for another form of contextualism that has little to do with standards and a lot with the well-known problem of the reference class. This paper also illustrates the fact that contextualism comes in many varieties. Only a couple of years ago, one could still easily make sense of general questions like “What do you think about epistemological contextualism?” In the meantime, so many different positions have been developed under the heading of “contextualism” that one is tempted to reply “It depends on what you mean by ‘contextualism’”. The variety has become so great that what is a serious objection to one form of contextualism might be even welcome support for another form of contextualism. Therefore, one should look at them one by one. One distinction is that between attributor and subject contextualism (cf. DeRose 1992, 918ff.; DeRose 1999, 190f.; Cohen 1987; Cohen 1988). In the meantime, it has become more popular to refer to the latter under the heading of “subject sensitive invariantism” (cf., e.g., Hawthorne 2004, ch.4) and to reserve the term “contextualism” for the former. I will go with this and take contextualism to be, broadly speaking, the following thesis: The truth-value of knowledge ascriptions of the 1 Published in Grazer Philosophische Studien 69, 2005, 229-245. 2 form “S knows that p” (and of related forms, of course) may (but need not) change with the speaker’s context (or the thinker’s context, for that matter). That is, it may change from speaker to speaker or between different contexts one and the same speaker finds herself in. To choose what is perhaps the most overused example in this context: In one (an ordinary) context it might be true to say or think that Jack knows that he has hands, but in another (sceptical) context it might not be true.2 But what is a context and how should we individuate contexts? Most contextualists seem to agree that contexts differ with respect to the relevant epistemic standards. In an ordinary context, epistemic standards are modest enough to allow for Jack to know that he has hands; in a sceptical context, however, standards are so strict that he won’t even know that. So, contexts are determined by the epistemic standards which count as the relevant ones in a given situation. It has become so much standard among contextualists to make contexts depend on epistemic standards that one could also speak of “standard”-contextualism in both senses of the word. In what follows I will take a look at a very prominent way to explain the difference between more modest and stricter standards, and will also say why I’m not happy with it. After that, I will try to make a constructive alternative proposal and defend another form of contextualism – a version that has little to do with standards and deserves much more attention than it has received so far. But first to standards. 2 I will take the stylistic freedom to switch from the metalinguistic level to the object-level whenever nothing hinges on it (cf. Lewis 1996, 567). 3 1. Standards According to authors like DeRose 1995 and others (for a slightly different view cf. Cohen 1998, 289-291 or Cohen 1999, 57-60) S’s knowledge that p requires that S can rule out or that S’s evidence eliminates alternate possibilities incompatible with the truth of “p”. To rule out a possibility, S needs to have evidence to the effect that the possibility in question is not actual. An uneliminated alternate possibility is one in which the subject would have exactly the same experience and evidence as they actually have (cf. Lewis 1996). For lack of a better term, I will say that S “eliminates” a possibility just in case S can either rule it out or S’s evidence eliminates it. Now, which alternate possibilities does the subject need to eliminate? Well, according to the philosophers just referred to, that depends on the epistemic standards relevant in the context of the attributor (speaker or thinker). According to laxer standards, Jack has to eliminate fewer and less remote possibilities in order to make “Jack knows that there is a hot dog in front of him” true. For instance, he just has to eliminate the possibility that there is nothing but a fake hot dog, made out of wax, in front of him. According to stricter standards, Jack has to eliminate more and more remote possibilities in order to make “Jack knows there is a hot dog in front of him” true. For instance, he would have to be able to eliminate the possibility that he is a Cartesian dreamer dreaming of some hot dog in front of him when there is none. Given stricter standards, Jack has to eliminate all possibilities he has to eliminate under laxer standards plus some more remote possibilities.3 Given laxer standards, it is true to say that Jack knows that there 3 It seems to be a (usually implicit) assumption of many contextualists that if S can eliminate a more remote possibility, then they can ipso facto eliminate a closer possibility. It is not obvious at all whether this is the case. Is it not conceivable that I can eliminate the possibility that I am a robot from 4 is a hot dog in front of him, at least if we assume that Jack can tell wax dogs from real hot dogs. However, given stricter standards, this might not be true. One of the main points of contextualism is that there is no single “true” standard or context. There is rather a plurality of contexts and in some it is true whereas in others it is false to say that S knows that p. In this sense – but in this harmless sense only – contextualism is a form of relativism. There are several general objections one could make against the version of contextualism just sketched (and I really only want to talk about the basic idea here and neglect finer differences between different versions of it). First, one might complain about a certain circularity in talk about “eliminating possibilities”. Suppose we claim that Jack knows there is a hot dog in front of him and that he can eliminate the possibility that it is only a wax imitation of a hot dog. If “eliminating the possibility that it is an imitation” means something like “knowing that it is no imitation”, then we are explaining “knowledge that there is a hot dog” in terms of “knowledge that it is not something else”. We are using the explanandum in the explanans and that is not good. What if “eliminating the possibility that q” does not mean or imply “knowing that not q”? Well, what could it mean then? Something like “having good reasons to believe that not q”? But even good reasons can be misleading. Jack has excellent reasons to believe there is no wax hot dog in front of him; however, unbeknownst to him, he is confronted with the latest high tech wax imitation of a hot dog and cannot tell it from a real hot dog. He therefore doesn’t know there is a hot dog in front of him. In other words, it seems we are facing a dilemma: Either we are reading “eliminating” in a sense that is too weak (e.g., as “having good reasons”); or we are reading it in a strong Mars (remote possibility) but that I cannot, for some reason, eliminate the possibility that I was born on the 5th of May rather than, say, the 4th of May at 11.45 pm? 5 enough sense but then the situation is even worse because we smuggle the explanandum into the explanans. Hence, one might conclude, all this stuff about “eliminating possibilities” does not lead anywhere (on “ruling out” see also Dretske 1970 and 1981b). The short reply to this objection is that we need not be interested at all in a reductive explanation of the concept of knowledge here (who has ever managed to reductively define concepts like that?). Apart from that, the objection only seems to work for the internalist interpretation of “eliminating a possibility” as “ruling it out”. The objection does not seem to work for, say, Lewis’ more externalist talk about “eliminating possibilities”. Hence, the objection above is, one might reply, without force. I think one can reformulate the objection but there is a much more serious problem with the contextualist story about eliminating possibilities. It concerns the underlying assumption that one can rank possibilities or possible worlds, for that matter, in terms of their remoteness from the actual world (cf., e.g., DeRose 1995, 36-37 and, as a background, Nozick 1981, 172ff. on sensitivity; cf. also, in general: Williams 2004). Our contextualist wants to say that in a stricter context the subject has to eliminate all the possibilities she has to eliminate in laxer contexts plus more remote possibilities. It is false to say “Jack knows that he has hands” if he can only eliminate the possibility that he is a brain in a vat but not the possibility that he has stumps instead of hands.4 If there is something wrong with the idea of a ranking of possible worlds in terms of remoteness, then this version of contextualism collapses, as we will see.