Daniel Gregory

In the last fifteen years, philosophical interest in inner speech has increased drastically. Although philosophers working on the topic have often made claims about inner speech generally, it seems they have often only been thinking about inner speech in voiced languages. However, inner speech can also take place in sign languages. Externally signed speech differs from externally voiced speech in ways which go beyond the sensory modality involved. For one thing, the experience of externally signed speech is perspective-relative in a way that the experience of externally voiced speech is not. For another, the process of signing externally (moving one’s hands etc.) is not distinct from the speech produced (the movements), whereas the process of producing voiced speech externally (moving one’s mouth) is distinct from the sounds produced (the soundwaves). This justifies the extrapolation that inner speech in sign languages may differ in important ways from inner speech in voiced languages. I show that a number of claims that have been made about inner speech—about the content of inner speech, about the tokening of words in inner speech, and about the role of inner speech in self-knowledge—are complicated if one takes account of inner speech in sign languages.

This book explores what we can learn about two fascinating mental states, dreaming and memory, by investigating them in tandem. This brings to the surface several issues about the phenomena which are not apparent when we think about each in isolation. The 15 contributions are arranged into three parts: Part I: Remembering Dreams; Part II: Remembering Within Dreams; and Part III: Remembering and Dreaming Compared. The authors apply a range of methodologies: philosophical, exegetic, experimental, and formal.

There are two leading theories about the ontology of dreams. One holds that dreams involve hallucinations and beliefs. The other holds that dreaming involves sensory and propositional imagining. I highlight two features of dreams which are more easily explained by the imagination theory. One is that certain things seem to be true in our dreams, even though they are not represented sensorily; this is easily explained if dreams involve propositional imagining. The other is that dream narratives can be temporally segmented, involving events which take place across long spans of time; this makes sense if dreams involve sensory imagining, for we often sensorily imagine narratives during wakefulness in the same way. The two considerations are unified by the fact that both highlight forms of content determination characteristic of imagining.

The purpose of this paper is not to show that the answer to the question in the title is ‘no’, but to show that it is ‘probably not’, at least on one particular theory of memory. Assuming that an experience will only be an episodic memory if we are ‘disposed to take the relevant experience into account when judging about the past’ (Debus 2010, p. 25), there are many obstacles to answering the question in the affirmative. If one holds that it is possible to have episodic memories during dreams, they will have to accept more implications than may be palatable. Specifically, they will have to believe, contra Sosa (2007), that we can actually make judgments during dreams and not just imagine doing so; that we retain a fairly high degree of rationality during dreams; and that there is a respectable sense in which we can refer to the past at all when we dream.

Nico Silins (2012, 2013, 2020) argues that conscious judgments justify self-attribution of belief in the content judged. In defending his view, he makes use of Moore’s Paradox, seeking to show how his theory can explain what seems irrational or absurd about sentences of the form, ‘p and I do not believe that p’. I show why his argument strategy is not available to defend the view that conscious judgments can justify the self-attribution of belief in the content judged. I then propose an amended version of his theory, which holds that sincerely asserting a proposition—whether aloud or silently—justifies self-ascribing belief in the proposition expressed. In doing so, I draw on an argument which I made in Gregory (2018) that there is something it is like to make a sincere assertion which is different from what it is like to make an insincere assertion. The phenomenology of sincere assertion provides immediate justification for self-ascription of belief in a proposition which has been sincerely asserted; nonetheless, it may be that we need to interpret our own assertions in order to determine which propositions they express. This paves the way for showing how two competing schools of thought about self-knowledge—one which holds that self-knowledge is immediate and one which holds that self-knowledge is inferential—might be combined.

Inner speech is known as the “little voice in the head” or “thinking in words.” It attracts philosophical attention in part because it is a phenomenon where several topics of perennial interest intersect: language, consciousness, thought, imagery, communication, imagination, and self-knowledge all appear to connect in some way or other to the little voice in the head. Specific questions about inner speech that have exercised philosophers include its similarities to, and differences from, outer speech; its relationship to reasoning and conceptual thought; its broader cognitive roles—especially within metacognition and self-knowledge; and the role it can play in explanations of auditory verbal hallucinations and “thought insertion”.

This edited volume is the first systematic philosophical investigation of the complex and multifarious relationships between dreaming and memory. Featuring fifteen contributions by leading researchers, it explores a range of issues that arise when dreaming and memory are considered together. What does one remember when one remembers what one dreamt, and what is it for a memory of a dream to be accurate? What are the phenomenological, cognitive, and epistemic similarities and dissimilarities between dreaming and remembering? How does the self figure in dreams and memories? The book will serve as an indispensable resource both for philosophers interested in dreaming or memory and for their philosophically-minded colleagues in empirical disciplines and will provide an invaluable starting point for advanced students in need of a snapshot of the state of the art in philosophical research on dreaming and memory. Chapters [2], [10], and [16] are available open access under a Creative Commons Attribution 4.0 International License.

The problem of dream skepticism – i.e., the problem of what can justify one’s belief that they are not dreaming – is one of the most famous problems in philosophy. I propose a way of responding to the problem which is available if one subscribes to the theory that the sensory experiences that we have in dreams consist of images (as opposed to false percepts). The response exploits a particular feature of imagination, viz., that it is not possible to simultaneously have two separate imagistic experiences in the same modality.

In November 2022, OpenAI released ChatGPT, an incredibly sophisticated chatbot. Its capability is astonishing: as well as conversing with human interlocutors, it can answer questions about history, explain almost anything you might think to ask it, and write poetry. This level of achievement has provoked interest in questions about whether a chatbot might have something similar to human intelligence or even consciousness. Given that the function of a chatbot is to process linguistic input and produce linguistic output, we consider the question whether a sophisticated chatbot might have inner speech. That is: Might it talk to itself, internally? We explored this via a conversation with ‘Playground’, a chatbot which is very similar to ChatGPT but more flexible in certain respects. We asked it questions which, plausibly, can only be answered if one first produces some inner speech. Here, we present our findings and discuss their philosophical significance.

There is a growing literature in philosophy dealing with the phenomenon of inner speech, that is, the activity of speaking to oneself in one’s mind. This paper highlights a feature of inner speech which has not yet been noticed in this literature: that there is something distinctive that it is like to make a sincere assertion in inner speech. The paper then traces out two implications of this observation. The first relates to the question of how we should characterise inner speech; the second relates to the question of how inner speech may play a role in self-attributions of belief.

A theory which has had significant influence seeks to explain auditory verbal hallucinations as utterances in inner speech which are not properly monitored and are consequently misattributed to some external source. This paper argues for a distinction between inner speech and imagined speech, on the basis that inner speech is a type of actual speech. The paper argues that AVHs are more likely instances of imagined speech, rather that inner speech, which are not properly monitored : 86–107, 2012), Cho and Wu and Cho and Wu, although they prefer a quite different explanation of AVHs).

This dissertation explores the phenomenon of inner speech. It takes the form of an introduction, which introduces the phenomenon; three long, largely independent chapters; a conclusion; and an appendix. The first chapter deliberates between two possible theories as to the nature of inner speech. One of these theories is that inner speech is a kind of actual speech, just as much as external speech is a kind of actual speech. When we engage in inner speech, we are actually speaking, but we are doing so silently. The other theory holds that inner speech is a kind of imagined speech. When we produce inner speech, we are imagining performing the action of speaking. The chapter argues for the theory that inner speech is a kind of actual speech. The second chapter argues against a theory which holds that inner speech is dialogic. On this theory, a subject represents different perspectives in inner speech and a dialogue can take place in the same sense in which a dialogue can take place between different individuals in external speech. The chapter borrows some important material from the philosophy of language to show that this position, though it might have some intuitive appeal, is ultimately implausible. The third chapter is concerned with the question whether inner speech can be a source of knowledge of our own beliefs. It shows that the view that inner speech can be such a source is subject to an adapted version of a problem from the epistemology of testimony: roughly, what justification do we have for believing that we believe what we say in inner speech? It makes use of some material from the recent debate about cognitive phenomenology to develop a version of the view which is not subject to this problem. It then provides some initial discussion of the merits of this view. The appendix takes up a more practical issue regarding inner speech. There is a theory that auditory verbal hallucinations – i.e. experiences of voice-hearing – take place when someone produces an utterance in inner speech but loses track of the fact that they have produced the utterance. Accordingly, they have an experience as of something being said and, not realising that they are the source of the experience, postulate some external cause, i.e. someone else speaking. The appendix develops an alternative account which has been suggested in the literature, at times drawing upon earlier work in the dissertation.