Online research in philosophy

This paper investigates, formulates and proves an indexical barrier theorem, according to which sets of non-indexical sentences do not entail (except under specified special circumstances) indexical sentences. It surveys the usual difficulties for this kind of project, as well some that are specific to the case of indexicals, and adapts the strategy of Restall and Russell’s “Barriers to Implication” to overcome these. At the end of the paper a reverse barrier theorem is also proved, according to which an indexical sentence will not, except under specified circumstances, entail a non-indexical one.

Indexicality is a feature of predicates and predicate components (verbs, adjectives, adverbs and the like) as well as of referring expressions. With classic referring indexicals such as 'I' or 'that' a distinctive rule takes us from token and context to some item present in the content which is the semantic correlate of the token. Predicates and predicate components may function in an analogous fashion. For example 'thus' is an indexical adverb which latches onto some manner of performance present in its context. 'John sang thus', said while indicating someone singing discordantly, claims that John sang discordantly. The phenomenon of predicatival indexicality is widespread in English and is expressed in a variety of idioms. Indexical predication plays important epistemological and psychological roles and the notion may have other interesting philosophical applications.

Frege held that indexical thoughts could be retained through changes of context that required a change of indexical term. I argue that Frege was partially right in that a singular mode of presentation can be retained through changes of indexical. There must, however, be a further mode of presentation that changes when the indexical term changes. This suggests that indexicals should be regarded as complex demonstratives; a change of indexical term is like a change between 'that φ' and 'that ψ', where 'φ' and 'ψ' pick out relational properties that may nonetheless be conceived of by the thinker as intrinsic.

It is widely agreed that the references of indexical expressions are fixed partly by their relations to contextual parameters such as the author, time, and place of the utterance. Because of this, indexicals are sometimes described as token-reflexive or utterance-reflexive in their semantics. But when we inquire into how indexicals help us to identify items within experience, we find that while utterance-reflexivity is essential to an interpretation of indexical tokens, it is not a factor in a speaker's identificatory use of indexicals. Tokens cannot be interpreted unless they are first produced, and obviously the speaker who produces them does not depend upon utterance parameters in order to identify their referents in the way that hearers do. Consequently, the standard reflexive accounts of indexicals are of little use in explaining the speaker's identificatory use of indexicals, and must be either replaced or complemented by a further theory of the role of indexicals in thought. This paper provides an account of indexical identification that is attentive to a speaker's as well as a hearer's identification and reveals how indexicals are inextricably perspectival.

A conception of pragmatics distinguishes pragmatics from semantics proper in terms of indexicality: semantics is conceived as the quest for a truth definition for languages without indexical expressions; semantics is conceived as a quest for a truth definition for languages with indexical expressions. I argue that indexicality is not a feature that can be used to capture anything like what Morris and Carnap had in mind.

Many philosophers, in different areas, are tempted by what variously goes under the name of Contextualism, Speaker Relativism, Indexical Relativism. (I’ll just use Indexical Relativism in this paper.) Thinking of certain problematic expressions as deriving their content from elements of the context of use solves some problems. But it faces some problems of its own, and in this paper I’m interested in one in particular, namely, the problem of disagreement. Two alternative theories, tempting for just the same kinds of expressions as Indexical Relativism is meant to handle, promise to solve the problem of disagreement. I’ll argue that they do not live up to their promise. At the end of the paper, I’ll ask what exactly disagreement amounts to, and I’ll canvass some purported solutions.

It is well known that Husserl’s Logical Investigations contain the beginnings of an account of the meanings of indexical expressions, expressions whose meanings depend essentially on some sort of explicit or implicit pointing or indication [Anzeigen], and therefore on some contribution by the surroundings of speaker and hearer. Husserl in fact speaks explicitly of ‘occasional expressions’, that is of expressions like ‘this’ and ‘that’ whose meanings depend on features of the occasion of use, but it is possible to gauge the full implications of his explicit remarks on the problem of indexical or occasional meanings only if these are read in conjunction with what he says elsewhere in the Investigations, especially on the subject of perceptual judgments and proper names.

Some time ago, John Perry argued that the content of an indexical belief, that is, a belief expressible with a sentence containing an indexical or demonstrative, cannot be a proposition. I consider several of his arguments for this view, and show that they can be extended to show that belief expressible with other non-indexical expressions such as natural kind terms and proper names presents the very same problem for the traditional picture. I then suggest that if indexical belief has any special status, this is not because it has a special kind of content, but rather because action is impossible if agents do not have indexical belief.

Call a thought whose expression involves the utterance of an indexical an indexical thought . Thus, my thoughts that I’m annoyed, that now is not the right time, that this is not acceptable, are all indexical thoughts. Such thoughts present a prima facie problem for the thesis that thought contents are phenomenally individuated – i.e., that each distinct thought type has a proprietarily cognitive phenomenology such that its having that phenomenology makes it the thought that it is – given the assumption that phenomenology is intrinsically determined (i.e.