Christopher Gauker

This paper compares two approaches to the semantics of modal expressions such as ‘might’. Both approaches define the conditions under which sentences of a language (not only modals) are acceptable relative to sets of possible worlds. Both approaches say that the sentence ‘Vivian might be in Vienna’ is acceptable relative to such a set if and only if ‘Vivian is in Vienna’ is true in some world in the set. One of these approaches treats the pertinent sets of worlds as information states of speakers. The other treats these sets as models of the statements that are objectively relevant in a conversation. This paper argues that the second of these approaches can better explain how statements made by means of modal sentences can be informative. It also suggests alterations to some common assumptions about the taxonomy of modals.

In amodal completion the mind in some sense completes the visual perceptual representation of a scene by representing parts of the scene hidden behind other objects. Cognitive science has had a lot to say about how amodal completion occurs but has had little to say about the format of the representations involved and the way in which they represent. Some philosophers hold that amodal completions take the form of sensory imaginings of the occluded portions. This theory poses a puzzle for both philosophy and neuroscience about how the occluded parts are imagined to be located relative to the unoccluded parts. A better theory begins with the observation that for many purposes it is useful to suppose that the mind contains mental models of three-dimensional structure. Visual perceptions and mental images may be conceived as mental models that represent external scenes by virtue of homomorphism and which possess both a deep aspect, representing both visible and occluded three-dimensional structure, and a perspectival aspect, representing only an arrangement of visible surfaces. In these terms we can explain various problem-solving abilities, such as the ability to imagine what a scene will look like from another point of view. Amodal completions can be treated as deep perceptual representations of three-dimensional structure. Thus amodal completions do not consist of mental imagery, but they can be used to generate mental imagery representing how a scene would look from alternative points of view.

Jill de Villiers has argued that children's mastery of sentential complements plays a crucial role in enabling them to succeed at false-belief tasks. Josef Perner has disputed that and has argued that mastery of false-belief tasks requires an understanding of the multiplicity of perspectives. This paper attempts to resolve the debate by explicating attributions of desires and beliefs as extensions of the linguistic practices of making commands and assertions, respectively. In terms of these linguistic practices one can explain why desire-talk will precede belief-talk and why even older children will have difficulty attributing incompatible desires

We may suppose that the truth predicate that we utilize in our semantic metalanguage is a two-place predicate relating sentences to contexts, the truth-in-context-X predicate. Seeming paradoxes pertaining to the truth-in-context-X predicate can be blocked by placing restrictions on the structure of contexts. While contexts must specify a domain of contexts, and what a context constant denotes relative to a context must be a context in the context domain of that context, no context may belong to its own context domain. A generalization of that restriction appears to block all of the paradoxes of truth-in-context-X. This restriction entails that, in a certain sense, we cannot talk about the context we are in. This result will be defended, up to a point, on broadly ontological grounds. It will also be conjectured that our semantic metalanguage can be regarded as semantically closed.

A number of authors have asked what it takes for a course of mental imagery to be epistemically or practically useful. This paper addresses a prior question, namely, the difference between courses of imagination that are realistic and those that are fantastic. One approach, suggested by recent literature concerning the utility of imagery, holds that a course of imagination represents realistically if and only if the course of events represented conforms to certain accepted constraints. Against this it will be argued that the constraints cannot be both permissive enough and restrictive enough. An alternative approach adds as a necessary condition that realistic courses of imagination are constructed in accordance with certain procedures on the basis of remembered perceptions.

It is widely accepted that when ‘might’ expresses certain kinds of relative modality, the sentence ‘p and it might not be the case that p’ is in some sense inconsistent. It has proven difficult to define a formal semantics that explicates this inconsistency while meeting certain other desiderata, in particular, that p does not imply ‘Must p’. This paper presents such a semantics. The key idea is that background contexts have to have multiple levels, including an inner set consisting of worlds that represent what might be true and an outer set of worlds such that a sentence must be true only if it is true in all of them. This is an open access publication.

This paper aims to clear a path for the thesis that inner speech, in the very languages we speak, is the sole medium of all conceptual thought. First, it is argued that inner speech should not be identified with the auditory imagery of speech. Since they are distinct, there may be many more episodes of inner speech than those that are accompanied by auditory imagery. Second, it is argued that it is not necessary to conceive of linguistic communication as a matter of the speaker’s revealing through words an underlying thought. Rather, acts of speech may be conceived as producing cooperation by intervening on processes of thought that are essentially imagistic. So conceived, the practice of speaking in language may acquire a function wholly internal to the individual, where it adds a layer of coordination to an underlying foundation of imagistic cognition.

This paper disputes the widespread assumption that beliefs and desires may be attributed as theoretical entities in the service of the explanation and predic- tion of human behavior. The literature contains no clear account of how beliefs and desires might generate actions, and there is good reason to deny that principles of rationality generate a choice on the basis of an agent’s beliefs and desires. An alter- native conception of beliefs and desires is here introduced, according to which an attribution of belief is, in a certain sense, an assertion on the believer’s behalf and an attribution of desire is, in a certain sense, a command on the desirer’s behalf. In terms of this conception of the attribution of beliefs and desires, we can begin to understand how attributions of beliefs and desires can be explanatory, although we still cannot expect the attribution of beliefs and desires to generate predictions based on an assumption of rationality. Finally, the reality of beliefs and desires is likened to the reality of money; it is the reality of things governed by objective norms.

A conversation can be conceived as aiming to circumscribe a set of possibilities that are relevant to the goals of the conversation. This set of possibilities may be conceived as determined by the goals and objective circumstances of the interlocutors and not by their propositional attitudes. An indicative conditional can be conceived as circumscribing a set of possibilities that have a certain property: If the set of relevant possibilities is subsequently restricted to one in which the antecedent holds, then it will be restricted as well to one in which the consequent holds. We will identify a number of desiderata concerning the validity of arguments; we will develop a formally precise semantics for conditionals conceived in this way that satisfies the desiderata, and we will present a deductive calculus that is sound and complete with respect to the semantics. Finally, we will argue that the semantics compares well, both formally and foundationally, with two other semantic theories of indicative conditionals that satisfy the desiderata, namely, those of Gillies and Bledin.

When we imaginatively picture what might happen, we may take what we imagine to be either realistic or fantastic. A wine glass falling to the floor and shattering is realistic. A wine glass falling and morphing into a bird and flying away is fantastic. What does the distinction consist in? Two important necessary conditions are here defined. The first is a condition on the realistic representation of spatial configuration, grounded in an account of the imagistic representation of spatial configuration. The second is a condition on the manner in which realistic courses of mental imagery may be grounded in remembered perceptions. This is defined in terms of an account of the representation of comparative similarity. This is an open access publication.

This study examines the relation of language use to a person’s ability to perform categorization tasks and to assess their own abilities in those categorization tasks. A silent rhyming task was used to confirm that a group of people with post-stroke aphasia (PWA) had corresponding covert language production (or “inner speech”) impairments. The performance of the PWA was then compared to that of age- and education-matched healthy controls on three kinds of categorization tasks and on metacognitive self-assessments of their performance on those tasks. The PWA showed no deficits in their ability to categorize objects for any of the three trial types (visual, thematic, and categorial). However, on the categorial trials, their metacognitive assessments of whether they had categorized correctly were less reliable than those of the control group. The categorial trials were distinguished from the others by the fact that the categorization could not be based on some immediately perceptible feature or on the objects’ being found together in a type of scenario or setting. This result offers preliminary evidence for a link between covert language use and a specific form of metacognition.

If we say that the truth of a statement of the form “S knows that p” depends on the pertinent context, that raises the question, what determines the pertinent context? One answer would be: the speaker. Another would be: the speaker and the hearer jointly somehow. Yet a third answer would be: no one gets to decide; it is a matter of what the conversation is supposed to achieve and how the world really is, and it can happen that all of the interlocutors are mistaken about the pertinent context. In this way, the context relevant to knowledge attributions might be mind-independent. In this chapter, we will explore the consequences of taking contexts to be mind-independent. We will not give a definitive account of what determines the pertinent context, but we will have something to say about it. Our focus will be on pointing out that certain debates that have been conducted in the literature might have a different outcome if the possibility that contexts are mind-independent were clearly on the table.

Explanations of animal problem-solving often represent our choices as limited to two: first, we can explain the observed behavior as a product of trained responses to sensory stimuli, or second, we can explain it as due to the animal’s possession of general rules utilizing general concepts. My objective in this essay is to bring to life a third alternative, namely, an explanation in terms of imagistic cognition.The theory of imagistic cognition posits representations that locate objects in a multidimensional similarity space. It proposes that an animal’s expectations can be explained on the basis of the similarity of novel objects to objects previously encountered.The animal can predict the behavior of the novel object by producing a mental movie of the novel object by morphing it into an object, the behavior of which has previously been observed. After criticizing the theory of concept abstraction, I will identify some of the key elements of imagistic cognition.Then I will attempt to illustrate the utility of this conception of cognition by using it to explain the combination of successes and failures observed in monkeys in tool- mediated retrieval tasks (Fujita et al. 2003; Fujita et al. 2011) and in great apes in trap tube and trap table experiments (Martin-Ordas et al. 2008; Martin-Ordas et al. 2012).

How can thinking be effective in enabling us to meet our goals? If we answer this in terms of representation relations between thoughts and the world, then we are challenged to explain what representation is, which no one has been able to do. If we drop the appeal to representation, then it is hard to explain why certain inferences are good and others are not. This paper outlines a strategy for a nonrepresentationalist account of the way in which the structure of reality may drive cognition. It begins by restricting our attention to certain paradigm cases of linguistically-mediated cooperative exchange. Second, it introduces a kind of nonconceptual thinking -- thinking in mental images. Third, in terms of imagistic cognition, the nonnormative conditions under which sentences are asserted and accepted is explained. Fourth, in terms of these conditions, the possibility of successful linguistic exchange in the paradigm cases is to be explained. Fifth, the strategy calls for an explanation how a language can be internalized and become a medium of intrapersonal thought. Finally, the norms of discourse can be conceived as norms that supervise the processes of linguistic exchange so explained. In this paper only the first three steps of the overall strategy will be carried out in any detail. But a strategy for completing the last three steps will be sketched.

Many of the terms of our language, such as “jar”, are open-textured in the sense that their applicability to novel objects is not entirely determined by their past usage. Many others, such as the verbs “use” and “have”, are schematic in the sense that they have only a very general meaning although on any particular occasion of use they denote some more particular relation. The phenomena of open texture and schematicity constitute a sharp challenge to referential semantics, which assumes that every non-logical term has a definite extension. A different, non-referential approach to formal semantics defines truth as relative to a context and defines contexts as built up from exclusively linguistic entities. For any given utterance of a sentence, there will be one of these contexts that pertains to it. In this framework, open texture and schematicity can be understood as consequences of the complex nature of the pertaining relation between contexts and utterances.

It is commonly supposed that perceptual representations in some way embed concepts and that this embedding accounts for the phenomenon of seeing-as. But there are good reasons, which will be reviewed here, to doubt that perceptions embed concepts. The alternative is to suppose that perceptions are marks in a perceptual similarity space that map into locations in an objective quality space. From this point of view, there are at least three sorts of seeing-as. First, in cases of ambiguity resolution, the schematicity of the figure leaves us with a choice as to where in perceptual similarity space to place a mark. Second, in cases where expertise affects perception, the accumulation of perceptual landmarks permits a more precise placement of a mark in perceptual similarity space. Third, extensive experience with an object allows similarity to that object to serve as an acquired dimension in perceptual similarity space, which in turn affects the relative similarities of other objects. This is an open access publication.

"Internalism" is the thesis that a subject's internal physical structure determines which beliefs and desires are properly attributable to him. Internalist theories of intentionality purport to solve several philosophical problems, most notably, how explanation in terms of belief and desire is compatible with subsumption of the subject under physical law. This dissertation argues that internalism is false. First it is argued that an internalistic construal of belief would make it impossible to understand a community's language-mediated division of epistemic labor. A second, more fundamental argument begins with an extensive account of how a subject's beliefs and desires might be inferred from his behavior. Here a number of methodological principles are formulated that must be respected if our attributions of belief and desire are best to serve prediction of the subject's behavior. These principles are used to show that there are no prospects for an internalistic psychological theory and that two subjects who are micro-structurally identical but embedded in physically different sorts of environment might be best interpreted as having different beliefs and desires. Finally, these general arguments are supported by independent criticisms of the internalist theories of Jerry Fodor and Daniel Dennett.

It is often assumed that, though we may speak in sentences that express propositions only inexplicitly, our thoughts must express their propositional contents explicitly. This paper argues that, on the contrary, thoughts too may be inexplicit. Inexplicit thoughts may effectively drive behavior inasmuch as they rest on a foundation of imagistic cognition. The paper also sketches an approach to semantic theory that accommodates inexplicitness in mental representations as well as in spoken sentences.

Some expressions, such as “all” and “might”, must be interpreted differently, relative to a single context, when embedded under “says that” than when unembedded. Egan, Hawthorne and Weatherson have appealed to that fact to argue that utterance-truth is relative to point of evaluation. This paper shows that the phenomena do not warrant this relativistic response. Instead, contexts may be defined as entities that assign other contexts to contextually relevant people, and context-relative truth conditions for indirect discourse sentences can be satisfactorily formulated in terms of such contexts.