Henry Jackman

Hillary Putnam has famously argued that we can know that we are not brains in a vat because the hypothesis that we are is self-refuting. While Putnam's argument has generated interest primarily as a novel response to skepticism, his original use of the brain in a vat scenario was meant to illustrate a point about the "mind/world relationship." In particular, he intended it to be part of an argument against the coherence of metaphysical realism, and thus to be part of a defense of his conception of truth as idealized rational acceptability. Putnam's conclusions about the scenario are, however, actually out of line with central and plausible aspects of his own account of the relationship between our minds and the world. Reflections on semantics give us no compelling reason to suppose that claims like "I am a brain in a vat" could not turn out to be true.

Many philosophers have suggested that belief predicates are ambiguous between a de dicto and a de re reading. However, the impression of ambiguity is a function of the narrow ranges of examples that philosophers focus on. When we consider our ascriptional practices as a whole, the suggestion that belief predicates are ambiguous is neither plausible nor needed to explain the de dicto/de re distinction. This paper will argue that understanding paradigmatic de dicto and de re ascriptions in terms of disavowals from a more basic sort of ascription is preferable to positing an ambiguity in which each of the two sorts of ascription are conceptually primitive.

While most pragmatists view themselves as pluralists of one sort or another, Talisse and Aikin argue thatthe two views are, in fact, "not compatible". However, while their charge may be true of the types of pluralism that they consider, these pluralisms all presuppose a type of realism about value that the pragmatic pluralist need not accept. In what follows, I'll argue that the 'non-realist' account of value that one finds in James underwrites a type of pluralism that is both substantial and compatible with pragmatism

This paper will appeal a recent argument for the indeterminacy of translation to show not that meaning is indeterminate, but rather that assertion cannot be explained in terms of an independent grasp of the concept of truth. In particular, it will argue that if we try to explain assertion in terms of truth rather than vice versa, we ultimately will not be able to make sense of the difference between assertion and denial. This problem with such 'semantic' accounts of assertion then illustrates why we need not worry about the purported argument for indeterminacy.

Ascriptions of content are sensitive not only to our physical and social environment, but also to unforeseeable developments in the subsequent usage of our terms. This paper argues that the problems that may seem to come from endorsing such 'temporally sensitive' ascriptions either already follow from accepting the socially and historically sensitive ascriptions Burge and Kripke appeal to, or disappear when the view is developed in detail. If one accepts that one's society's past and current usage contributes to what one's terms mean, there is little reason not to let its future usage to do so as well.

It has become increasingly popular to suggest that non-individualistic theories of content undermine our purported a priori knowledge of such contents because they entail that we lack the ability to distinguish our thoughts from alternative thoughts with different contents. However, problems relating to such knowledge of 'comparative' content tell just as much against individualism as non-individualism. Indeed, the problems presented by individualistic theories of content for self-knowledge are at least, if not more, serious than those presented by non-individualistic theories. Consequently, considerations of self-knowledge give one no reason to embrace individualism. If anything, they give one reason to reject it

Temporal externalists argue that ascriptions of thought and utterance content can legitimately reflect contingent conceptual developments that are only settled after the time of utterance. While the view has been criticized for failing to accord with our “ordinary linguistic practices”, such criticisms (1) conflate our ordinary ascriptional practices with our more general beliefs about meaning, and (2) fail to distinguish epistemically from pragmatically motivated linguistic changes. Temporal externalism relates only to the former sort of changes, and the future usage relevant to what we mean reflects reason-driven practices that are rational for us to defer to.

Those sympathetic to the naturalistic side of James hope that his critique of ‘philosophical materialism’ can be separated from those elements of his thinking that are essential to his pragmatism. Such a separation is possible once we see that James’s critique of materialism grows out of his views about its incompatibility with the existence of objective values. Objective values (as James understands them) are incompatible, however, not with materialism in its most general form, but rather with materialism that understood the ‘material world’ in terms of the sciences of the late nineteen hundreds. In particular, one could not defend the potential objectivity of value in the way that James hoped if one endorsed the particular ‘pessimistic’ cosmology characteristic of the sciences at the turn of the last century. Consequently, if one rejects certain ‘empirical assumptions’ associated with the science of James’s day, the possibility of a type of ‘melioristic materialism’ opens up, and this sort of materialist could still understand value in the way that James proposes.

NB: This paper has been largely displaced by my: “Externalism, Metasemantic Contextualism and Self-Knowledge”, in Goldberg, (ed.) Externalism, Self-Knowledge and Skepticism. New York: Oxford University Press, 2015, pp. 228-247. // While straightforwardly ambiguous words like “bank” and obviously indexical words like “I” are unproblematically treated as referring to different things in different contexts, such variations are displayed by terms that seem neither ambiguous nor indexical. This paper will argue that traditional accounts of word meaning (in which a single fixed meaning is attached to each entry in one’s ‘mental lexicon’) have problems accounting for how the referent of a non-ambiguous/non-indexical term can shift from context to context, while a moderate version of semantic holism can do so by understanding the comparative weight of the meaning-constitutive beliefs as itself something which can vary from context to context.

Akeel Bilgrami has always argued that the contents of our thoughts are constitutively constrained by what we could be said to know about them. In earlier work he explained this in terms of a connection between thought and rationality, but his recent book argues that the ultimate ground for self-knowledge rests in our notion of responsibility. This paper will examine these arguments, and suggest that if Bilgrami is right about how self-knowledge is grounded, then it need not constrain our content ascriptions as thoroughly as he once proposed that it must.

'Epistemic' theories of vagueness notoriously claim that (despite the appearances to the contrary) all of our vague terms have sharp boundaries, it's just that we can't know what they are. Epistemic theories are typically criticized for failing to explain (1) the source of the ignorance postulated, and (2) how our terms could come to have such precise boundaries. Both of these objections will, however, be shown to rest on certain 'presentist' assumptions about the relation between use and meaning, and if allows that the meaning constitutive elements of our linguistic practices can extend into the future, the possibility of a new sort of 'normative epistemicism' emerges