Brie Gertler

"Self-knowledge" is commonly used in philosophy to refer to knowledge of one's particular mental states, including one's beliefs, desires, and sensations. It is also sometimes used to refer to knowledge about a persisting self -- its ontological nature, identity conditions, or character traits. At least since Descartes, most philosophers have believed that self-knowledge is importantly different from knowledge of the world external to oneself, including others' thoughts. But there is little agreement about what precisely distinguishes self-knowledge from knowledge in other realms. Partially because of this disagreement, philosophers have endorsed competing accounts of how we acquire self-knowledge. These accounts have important consequences for the scope of mental content, for mental ontology, and for personal identity.

How does one know one's own beliefs, intentions, and other attitudes? Many responses to this question are broadly empiricist, in that they take self-knowledge to be epistemically based in empirical justification or warrant. Empiricism about self-knowledge faces an influential objection: that it portrays us as mere observers of a passing cognitive show, and neglects the fact that believing and intending are things we do, for reasons. According to the competing, agentialist conception of self-knowledge, our capacity for self-knowledge derives from our rational agency—our ability to conform our attitudes to our reasons, and to commit ourselves to those attitudes through avowals. This paper has two goals. The first is exegetical: to identify agentialism's defining thesis and precisely formulate the agentialist challenge to empiricism. The second goal is to defend empiricism from the agentialist challenge. I propose a way to understand the role of agency in reasoning and avowals, one that does justice to what is distinctive about these phenomena yet is compatible with empiricism about self-knowledge

The definitive statement of the Knowledge Argument was formulated by Frank Jackson, in a paper entitled “Epiphenomenal Qualia” that appeared in The Philosophical Quarterly in 1982. Arguments in the same spirit had appeared earlier (Broad 1925, Robinson 1982), but Jackson’s argument is most often compared with Thomas Nagel’s argument in “What is it Like to be a Bat?” (1974). Jackson, however, takes pains to distinguish his argument from Nagel’s. This entry will follow standard practice in focusing on Jackson’s argument, though I will also describe the main points of alleged similarity and dissimilarity between these two arguments.

I elaborate and defend a set of metaphysical and epistemic claims that comprise what I call the acquaintance approach to introspective knowledge of the phenomenal qualities of experience. The hallmark of this approach is the thesis that, in some introspective judgments about experience, (phenomenal) reality intersects with the epistemic, that is, with the subject’s grasp of that reality. In Section 1 of the paper I outline the acquaintance approach by drawing on its Russellian lineage. A more detailed picture of the approach emerges in succeeding sections, which respond to a range of objections. Some critics charge that approaches of this sort are overly idealized, in that they ignore the cognitive flaws and limitations of actual human beings. I begin to address these worries in Section 2, by arguing that the epistemic commitments of the acquaintance approach are in fact relatively modest. In Section 3, I sketch a picture of introspective reference that explains how phenomenal reality can intersect with the epistemic in a phenomenal judgment, as the acquaintance approach requires. Drawing on this picture of introspective reference, Section 4 sets out a practical strategy for achieving knowledge by acquaintance. Some contemporary acquaintance theorists (BonJour 2003, Fumerton 1996) employ demanding epistemic standards for knowledge by acquaintance, standards beyond those mandated by the acquaintance approach. In Section 5 I show that instances of introspective knowledge that meet less demanding standards can satisfy the acquaintance approach’s epistemic commitments. The final sections concern the most direct challenges to the acquaintance approach, which target the claim that phenomenal reality intersects with the epistemic. According to one such challenge, this claim is belied by the fact that possessing a phenomenal concept is a matter of having certain dispositions. Section 6 draws on a discussion by Sosa (2003) to articulate this challenge, and responds to it on behalf of the acquaintance approach. Section 7 addresses Stalnaker’s (2008) worry that, if phenomenal reality intersected with the epistemic, phenomenal information would be incommunicable.

This paper calls into question the viability of materialist reduction of the phenomenal. I revisit the 'Knowledge Argument', which claims that there is information about the phenomenal which is not reducible to, nor even inferable from, information about the physical. I demonstrate the failure of the two chief strategies for blocking the Knowledge Argument: analyzing phenomenal knowledge as an ability, and construing it as knowledge of facts which are ontologically reducible to physical facts. Materialist reduction of the phenomenal is, thus, untenable; materialists must adopt a more extreme, eliminativist view about the phenomenal

I will present a conceptual argument for a simulationist answer to (2). Given that our conception of mental states is employed in attributing mental states to others, a simulationist answer to (2) supports a simulationist answer to (1). I will not address question (3). Answers to (1) and (2) do not yield an answer to (3), since (1) and (2) concern only our actual practices and concepts. For instance, an error theory about (1) and (2) would say that our practices and concepts manifest a mistaken view about the real nature of the mental. Finally, I will not address question (2a), which is an empirical question and so is not immediately relevant to the conceptual argument that is of concern here

Externalism about mental content is now widely accepted. It is therefore surprising that there is no established definition of externalism. I believe that this is a symptom of an unrecognized fact: that the labels 'mental content externalism' -- and its complement 'mental content internalism' -- are profoundly ambiguous. Under each of these labels falls a hodgepodge of sometimes conflicting claims about the organism's contribution to thought contents, the nature of the self, relations between the individual and her community, and the epistemic availability of thoughts. This situation stems from the fact that contributors to debates about externalism differ in how they understand 'internal property'; these differences reveal (or, perhaps, generate) disparate conceptions of what is at issue in these debates. I argue that this situation is irremediable. There is no way to understand 'internal property' that will conform with prevailing beliefs about the nature of internalism and externalism, and with the usual taxonomy of leading positions. This ambiguity carries a heavy price: participants in these debates often argue at cross-purposes, disagreeing even on the nature of the evidence that could settle the question of externalism. Progress on the broad range of issues associated with these debates requires that we abandon the categories 'internalism' and 'externalism'. I close by suggesting a promising avenue for future research related to these issues.

It is often said that we can know our own thoughts more directly or with more certainty than anyone else can know them. And this disparity is usually taken to be principled, in that we would not be the rational, reflective beings that we are without it. My aim is to trace the consequences of a principled disparity between self-knowledge and other-knowledge for what may be termed the “mechanics ” of self-knowledge . I use a new thought experiment to show that if introspective states are merely causally related to introspected thoughts, the disparity between self-knowledge and other-knowledge is not truly principled. An account of self-knowledge adequate to a truly principled disparity will allow that thought tokens can be.

Alas, things are not quite so simple. As James implies, the term ‘introspection’ literally means ‘looking within’, but of course we do not visually inspect the interiors of our crania. What unites proponents of introspection is the claim that we can recognize our own mental states through some sort of attention—a non-visual ‘looking’—whose immediate objects are thoughts or sensations within oneself, in a non-spatial sense of ‘within’. (The term ‘introspection’ is occasionally given an ecumenical gloss, to refer to any method of knowing one’s own mental states, and not just self-directed attention. But the more restrictive use is standard, and provides the topic of the current entry.) As we will see, some contemporary philosophers and psychologists doubt that any such introspective process underlies self-knowledge.