Abstract

The essays that make up my dissertation share a methodological approach that aims to explore the philosophical implications of linguists' accounts of ordinary language use. In particular, all of them focus on epistemic natural language and the implications that linguists' accounts of such language has for epistemology. The first essay focuses on the debate about the norms that govern assertion and shows the ways in which research on natural language evidentiality has direct bearing. This essay uses existing cross-linguistic data about assertions in Quechua and Cheyenne to argue that assertions and the norms that govern them are more complex than allowed for in extant views. What makes Quechua and Cheyenne important is that they allow speakers to assert sentences the content of which they do not believe, or even believe to be false, as long as the sentence contains the right evidential marker. This is a problem for the current theories as they all take belief in the proposition being expressed as a minimal requirement for a speaker to felicitously assert. Given the data, I argue that we should see evidential markers as modifying the norm that is in place governing felicity of the current content. I go on to present three implementations of a context-sensitive norm and argue that only the ones that are evidence-based or completely contextual can properly capture the entire set of linguistic data. In the second essay I argue that epistemic uses of 'should' can be modelling using the standard Kratzerian modal canon. In Kratzer's system, modals induce quantification over some partially ordered, restricted class of worlds. The relevant partially ordered, restricted class of worlds is generally fixed by two ingredients: a modal base and an ordering source. Modelling epistemic uses of 'should' requires us to rethink and expand what has traditionally been thought of as making up an epistemic modal base. Traditionally it has been thought that epistemic modal bases just include information about probabilities but this thought needs to be updated in order to bring epistemic 'should' into the fold. I argue that there are good theoretical reasons for having as uniform a semantics as possible then show that the context-sensitive semantic model that I develop meets all empirical demands. I end the essay by arguing that this updated way of thinking about epistemic modals bases has implications for epistemology. The final essay outlines the broad type of methodological approach mentioned above that guides the research throughout the dissertation. In it, I argue that the results of linguistics' theorizing about semantics, especially within the epistemic domain, ought to be seen as an accurate guide to reality. Looking to the way that language evolves over time and what it takes for information to become encoded into language is what drives this result. Buttressing the evolutionary explanation with results from the Condorcet Jury Theorem gives us more reason to believe that language is an accurate, albeit defeasible, guide to reality. If these results hold, they not only have broad implications for how we ought to be conducting our epistemological theorizing but our philosophical theorizing in general.