David Lewis (1941-2001) was Class of 1943 University Professor of Philosophy at Princeton University. His contributions spanned philosophical logic, philosophy of language, philosophy of mind, philosophy of science, metaphysics, and epistemology. In On the Plurality of Worlds, he defended his challenging metaphysical position, "modal realism." He was also the author of the books Convention, Counterfactuals, Parts of Classes, and several volumes of collected papers.

These works, as the sub-title makes clear, are unfinished sketches for Philosophical Investigations, possibly the most important and influential philosophical work of modern times. The 'Blue Book' is a set of notes dictated to Witgenstein's Cambridge students in 1933-1934: the 'Brown Book' was a draft for what eventually became the growth of the first part of Philosophical Investigations. This book reveals the germination and growth of the ideas which found their final expression in Witgenstein's later work. It is indispensable therefore (...) to students of Witgenstein's thought and to all those who wish to study at first-hand the mental processes of a thinker who fundamentally changed the course of modern philosophy. (shrink)

This paper argues that perception of one's body ‘from the inside’ provides one with an awareness of acting, and that this awareness explains a previously overlooked feature of one's knowledge of one's own actions. Actions are events: they occur during periods of time. Knowledge of such events must be sensitive to their course through time. Perception of one's body ‘from the inside’ allows one to monitor one's actions as they unfold, thereby sustaining one's knowledge of what one is doing over (...) the period of time in which one is doing it. (shrink)

Among the legacies of Elizabeth Anscombe's 1957 monograph Intention are the introduction of the notion of 'practical knowledge' into contemporary philosophical discussion of action, and her claim, pursued throughout the book, that an agent's knowledge of what he is doing is characteristically not based on observation.' Each idea by itself has its own obscurities, of course, but my focus here will be on the relation between the two ideas, how it is that the discussion of action may lead us to (...) speak of non-observational knowledge at all, and how this notion can be part of the understanding of a kind of ordinary knowledge that we have reason to consider practical rather than speculative. Anscombe mentions several quite different things under the heading of 'non-observational knowledge', and she first introduces the notion of the nonobservational for purely dialectical purposes, associated with the task of setting out the field she wants to investigate, in a way that ... (shrink)

Among the legacies of Elizabeth Anscombe's 1957 monograph Intention are the introduction of the notion of ‘practical knowledge’ into contemporary philosophical discussion of action, and her claim, pursued throughout the book, that an agent's knowledge of what he is doing is characteristically not based on observation. Each idea by itself has its own obscurities, of course, but my focus here will be on the relation between the two ideas, how it is that the discussion of action may lead us to (...) speak of non-observational knowledge at all, and how this notion can be part of the understanding of a kind of ordinary knowledge that we have reason to consider practical rather than speculative. Anscombe mentions several quite different things under the heading of ‘non-observational knowledge’, and she first introduces the notion of the nonobservational for purely dialectical purposes, associated with the task of setting out the field she wants to investigate, in a way that avoids begging the very questions she means to raise. She needs a way of distinguishing the class of movements to which a special sense of the question ‘Why?’ applies, but which doesn't itself employ the concepts of ‘being intentional’ or ‘acting for a reason’. Section 8 begins: “What is required is to describe this class without using any notions like ‘intended’ or ‘willed’ or ‘voluntary’ and ‘involuntary’. This can be done as follows: we first point out a particular class of things which are true of a man: namely the class of things which he knows without observation.” She first illustrates this by the example of knowledge of the position of one's limbs, the immediate way one can normally tell, e.g., whether one's knee is bent or not. But examples of this sort are in fact ill suited to shed light on the idea of ‘practical knowledge’, which is the true focus of the idea of the non-observational in the study of action. When we see this we will be better able to see why Anscombe is concerned with the non-observational in the first place, and how this concern is tied to other characteristic Anscombian theses, for instance that an action will be intentional under some descriptions but not others, and that practical knowledge is distinguished from speculative knowledge in being “the cause of what it understands”. And we will be able to understand how it is that an agent can be said to know without observation that he is doing something like painting the wall yellow, when this knowledge so patently involves claims about what is happening in the world, matters which it seems could only be known observationally. (shrink)

Voluntary acts are preceded by electrophysiological (RPs). With spontaneous acts involving no preplanning, the main negative RP shift begins at about200 ms. Control experiments, in which a skin stimulus was timed (S), helped evaluate each subject's error in reporting the clock times for awareness of any perceived event.

Epistemic freedom is the freedom to affirm anyone of several incompatible propositions without risk of being wrong. We sometimes have this freedom, strange as it seems, and our having it sheds some light on the topic of free will and determinism. This paper sketches a potential explanation for our feeling of freedom. The freedom that I postulate is not causal but epistemic (in a sense that I shall define), and the result is that it is quite compatible with determinism. I (...) therefore claim that insofar as we feel metaphysically free-free in a sense that would be incompatible with determinism-we are mistaking the epistemic freedom that we have for a kind of freedom that we may lack. This claim will lead me, at the end of the paper, to a projectivist account of moral responsibility. Ascriptions of moral responsibility, I shall suggest, should be treated in the same way as ascriptions of color or other secondary qualities. (shrink)

When I first read Intention as a student it seemed misnamed, since, I thought, it gave an account of intentional action all right, but left me still wondering what an intention was. It was only with years of rereading that I came to see that one beauty of the account was that it eliminated the need to ask.

Since Edmund L. Gettier reminded us recently of a certain important inadequacy of the traditional analysis of "S knows that p," several attempts have been made to correct that analysis. In this paper I shall offer still another analysis (or a sketch of an analysis) of "S knows that p," one which will avert Gettier's problem. My concern will be with knowledge of empirical propositions only, since I think that the traditional analysis is adequate for knowledge of nonempirical truths.

What is knowledge? How hard is it for a person to have knowledge? Good Knowledge, Bad Knowledge confronts contemporary philosophical attempts to answer those classic questions, offering a theory of knowledge that is unique in conceiving of knowledge in a non-absolutist way.

Fallibilism is the epistemological thesis that no belief (theory, view, thesis, and so on) can ever be rationally supported or justified in a conclusive way. Always, there remains a possible doubt as to the truth of the belief. Fallibilism applies that assessment even to science’s best-entrenched claims and to people’s best-loved commonsense views. Some epistemologists have taken fallibilism to imply skepticism, according to which none of those claims or views are ever well justified or knowledge. In fact, though, it is (...) fallibilist epistemologists (which is to say, the majority of epistemologists) who tend not to be skeptics about the existence of knowledge or justified belief. Generally, those epistemologists see themselves as thinking about knowledge and justification in a comparatively realistic way — by recognizing the fallibilist realities of human cognitive capacities, even while accommodating those fallibilities within a theory that allows perpetually fallible people to have knowledge and justified beliefs. Still, although that is the aim of most epistemologists, the question arises of whether it is a coherent aim. Are they pursuing a coherent way of thinking about knowledge and justification? Much current philosophical debate is centered upon that question. Epistemologists generally seek to understand knowledge and justification in a way that permits fallibilism to be describing a benign truth about how we can gain knowledge and justified beliefs. One way of encapsulating that project is by asking whether it is possible for a person ever to have fallible knowledge and justification. (shrink)

Infallibilism is the view that a belief cannot be at once warranted and false. In this essay we assess three nonpartisan arguments for infallibilism, arguments that do not depend on a prior commitment to some substantive theory of warrant. Three premises, one from each argument, are most significant: (1) if a belief can be at once warranted and false, then the Gettier Problem cannot be solved; (2) if a belief can be at once warranted and false, then its warrant can (...) be transferred to an accidentally true belief; (3) if a belief can be at once warranted and false, then it can be warranted and accidentally true. We argue that each of these is either false or no more plausible than its denial. Along the way, we offer a solution to the Gettier Problem that is compatible with fallibilism. (shrink)