William Seager

Our knowledge forms a highly interconnected and dynamically changing body of propositions. One obviously important way that knowledge changes is via rational inference, based either upon new insight into the content of what we already know or upon new knowledge provided by the senses. The most obvious codification of the acceptability of inference driven knowledge growth is the so-called known entailment closure principle, the principle that if S knows that p and knows that p implies q then S knows that q, or, more formally.

Donald Davidson espouses two fundamental theses about the individuation of mental events. The thesis of causal individuation asserts that sameness of cause and effect is sufficient and necessary for event identity. The thesis of content individuation gives only a sufficient condition for difference of mental events: if e and f have different contents then they are different mental events. I argue that given these theses, psychological externalism--the view that mental content is determined by factors external to the subject of the relevant mental events--entails that the token identity theory is false

The doctrine of physicalism can be roughly spelled out simply as the claim that the physical state of the world determines the total state of the world. However, since there are many forms of determination, a somewhat more precise characterization is needed. One obvious problem with the simple formulation is that the traditional doctrine of epiphenomenalism holds that the mental is determined by the physical (and epiphenomenalists need not assert that there are any properties except mental and physical ones, so one can freely add to epiphenomenalism the claim that everything is determined by the physical state of the world). However, the orthodox view, which seems obviously correct, is that physicalists would and should balk at the claim that epiphenomenalism is a form of physicalism. The philosophical zombie thought experiment vividly reveals exactly why epiphenomenalism is not a version of physicalism. According to traditional epiphenomenalism the determination relation in question is causation, and causal relations do not hold with full necessity. They hold with at most nomological necessity. Thus there is a possible world, w, in which the causal laws (or, if one prefers a more Humean approach, where the cosmic regularities) are different in such a way that the physical states which in the actual world cause mental states either cause no mental states at all in w (the zombie option) or cause aberrant mental states (the inverted spectrum option). Why should the physicalist care about this ‘mere possibility’? Because it shows that the mental can vary independently of the physical and there can be no better demonstration of ontological distinctness 1 than independent variation. Therefore, physicalism requires that the sort of determination at issue must exhibit maximum modal force; it must be absolutely impossible for the mental to vary without attendant, determining physical variation (let us label this relation ‘logical determination’). I think the best way to state physicalism which meets this constraint is in terms of what are called minimal physical duplicates (MPDs) of possible worlds (an approach pioneered by David Lewis, see Lewis (1983b); see also Jackson (1998) and Chalmers and Jackson (2001))..

RésuméFred Dretske a développé, à titre de composante de sa théorie de la conscience, une théorie de I'introspection. Celle-ciprésente une plausibilityé indépendante, elle résiste à des objections qui affectent nombre d'autres théories et elle suggère des liens très féconds dans plusieurs domaines de la science cognitive. La version qu'en donne Dretske est restreinte à la connaissance introspective des états perceptuels. Mon objectif ici est d'étendre la théorie à tous les états mentaux. Le mécanisme qui est fondamental dans cette approche est celui de la «conscience déplacée», c'est-à-dire le fait d'en venir à connaître quelque chose via l'expérience consciente que nous avons de quelque chose d'autre. Nous atteignons la connaissance introspective par l'application à notre propre expérience consciente du monde (et de nos corps) de la connaissance que nous avons de ce qui est de l'ordre du mental.

It has been argued that Psychological Externalism is irrelevant to psychology. The grounds for this are that PE fails to individuate intentional states in accord with causal power, and that psychology is primarily interested in the causal roles of psychological states. It is also claimed that one can individuate psychological states via their syntactic structure in some internal "language of thought". This syntactic structure is an internal feature of psychological states and thus provides a key to their causal powers. I argue that in fact any syntactic structure deserving the name will require an external individuation no less than the semantic features of psychological states

THIS ARTICLE ARGUES THAT WEAK SUPERVENIENCE IS\nSUFFICIENTLY STRONG TO ESTABLISH A REASONABLE AND PLAUSIBLE\nMATERIALISM. SUPERVENIENCE IS A RELATION BETWEEN FAMILIES\nOF PROPERTIES, SUCH THAT, ROUGHLY SPEAKING, FAMILY A\nSUPERVENES ON FAMILY B IF ANY OBJECTS WHICH ARE\nINDISCERNIBLE WITH RESPECT TO B ARE THEREBY INDISCERNIBLE\nWITH RESPECT TO A. WEAK SUPERVENIENCE IS SUPERVENIENCE\nRESTRICTED TO ONE POSSIBLE WORLD; STRONG SUPERVENIENCE IS A\n"NECESSARY" SUPERVENIENCE EXTENDING ACROSS SOME PRINCIPLED\nSET OF POSSIBLE WORLDS. THESE NOTIONS ARE MADE SOMEWHAT\nMORE RIGOROUS FOLLOWING JAEGWON KIM'S DEVELOPMENT OF THEM.\nKIM HAS ARGUED THAT ONLY STRONG SUPERVENIENCE CAN GROUND A\n'ROBUST' MATERIALISM, SO THE ARTICLE BEGINS BY CRITICIZING\nHIS ARGUMENTS FOR THIS POSITION. IT ARGUES THAT ANY FORM OF\nSTRONG SUPERVENIENCE IS IN FACT TOO STRONG TO CHARACTERIZE\nMATERIALISM AS IT IS NORMALLY CONCEIVED, FOR MATERIALISM IS\nNEITHER LOGICALLY NOR PHYSICALLY NECESSARY. BUT THE DAY IS\nSAVED AS WEAK SUPERVENIENCE CAN BE SHOWN TO BE JUST\nSUFFICIENTLY STRONG TO GROUND MATERIALISM. IN PARTICULAR,\nIT IS SHOWN THAT SUPERVENIENCE CAN SUPPORT COUNTERFACTUALS\nWITHOUT REQUIRING ANY NOTION OF "NECESSARY"\nSUPERVENIENCE

There are many possible forms of panpsychism. In this paper, I discuss a type of panpsychism in which the complex mental states of higher-level entities emerge from a system, or organization, of fundamental entities which possess extremely simple forms of mentality. I argue that this sort of panpsychism is surprisingly plausible, especially in light of the notorious difficulties raised by consciousness. Emergentist panpsychism faces a distinctive challenge, however. In so far as panpsychism embraces emergentism of the mental, a purely physicalist emergence seems to be metaphysically more economical. I will argue that a basic analysis of emergence throws this claim into doubt

_Metaphysics of Consciousness_ opens with a development of the physicalist outlook that denies the need for any explanation of the mental. This "inexplicability" is demonstrated not to be sufficient as refutation of physicalism. However, the inescapable particularity of modes of consciousness appears to overpower this minimal physicalism. This book proposes that such an inference requires either a wholly new conception of how consciousness is physical or a deep and disturbing new kind of physical inexplicability.

The most remarkable fact about the universe is that certain parts of it are conscious. Somehow nature has managed to pull the rabbit of experience out of a hat made of mere matter. Making its own contribution to the current, lively debate about the nature of consciousness, Theories of Consciousness introduces variety of approaches to consciousness and explores to what extent scientific understanding of consciousness is possible. Including discussion of key figures, such as Descartes, Foder, Dennett and Chalmers, the book covers identity theories, representational theories, intentionality, externalism, and the new information-based theories

It would be hard to deny that the experience of emotion is one of the most significant aspects of consciousness. While it is possible to imagine a being who enjoyed some forms of consciousness while lacking any awareness of its emotional states, such a being’s conscious life would be radically different from human consciousness. Yet, I believe that in fact we are surrounded by such beings and, most of the time, we ourselves are such. This is not to say that such beings lack emotions, or that they lack consciousness, or even that they lack a specific sort of emotional consciousness. But to be conscious of one’s own emotional state is much more complex than any of that, and much more rare. The framework within which I want to explore emotional consciousness is that of the representational theory of consciousness (RTC). One of the most exciting and fruitful advances in recent philosophical research in consciousness, there is now a plethora of distinct versions of RTC (see for example Carruthers 2000, Dretske 1995, Gennaro 1999, Lycan 1996, Rosenthal 1985, 1993a, 1993b, Tye 1995). Although I think the ultimate mystery of how or why the brain generates conscious experience remains unresolved by RTC, the theory nonetheless offers many insights into the nature of consciousness, and provides a theoretical viewpoint which addresses many of the philosophical problems of consciousness. In this paper, I want to extend the RTC so as to provide a theory of emotional consciousness and emotional introspection. The RTC postulates that if a cognitive system is conscious then it represents. More, consciousness is a kind of representation. Obviously, not every system that represents is conscious and not every representation generated by a conscious system is a conscious representation. Unfortunately, it is not yet very well understood what are the exact criteria for a representation’s being a conscious representation. Very abstractly, RTC posits that representations which play a certain ‘appropriate’ role within a cognitive system of ‘sufficient’ complexity are conscious representations..

A philosophical zombie is a being physically indistinguishable from an actual or possible human being, inhabiting a possible world where the _physical_ laws are identical to the laws of the actual world, but which completely lacks consciousness. For zombies, all is dark within, and hence they are, at the most fundamental level, utterly different from us. But, given their definition, this singular fact has no direct implications about the kind of motion, or other physical processes, the zombie will undergo within its own world. Under quite standard physicalist assumptions, such as certain assumptions about the 'initial conditions' of the zombie's world and that of the causal closure of the physical

There are plenty of books about consciousness, but none of them is like this book. On the first page we discover that ‘a great deal of this book is aimed at increasing rather than decreasing your perplexity’. At this Blackmore certainly succeeds. This is a testimony not only to the subject matter but her own deft and relentless exploration of every facet of consciousness as well as its study. It is her positive aim to lead the reader to the mystery inherent in even the most everyday forms of consciousness and to show conversely that truly exotic forms of consciousness are not that out of the ordinary.

I want to show that a common and plausible interpretation of what science tells us about the fundamental structure of the world – the ‘scientific picture of the world’ or SPW for short – leads to what I’ll call ‘generalized epiphenomenalism’, which is the view that the only features of the world that possess causal efficacy are fundamental physical features. I think that generalized epiphenomenalism follows pretty straightforwardly from the SPW as I’ll present it, but it might seem that, once granted, generalized epiphenomenalism is fairly innocuous, since its threat is too diffuse to provoke traditional worries about the epiphenomenal nature of mental states. If mental states are epiphenomenal only in the same sense that the putative powers of hurricanes, psyche- delic drugs or hydrogen bombs are epiphenomenal, then probably there is not much to worry about in the epiphenomenalism of the mental. I agree that the epiphenomenalism of hurricanes and the like is manageable, but it will turn out that ensuring manageability requires that mental states have an ontological status fundamentally different from that of hurricanes, drugs and bombs, a status that is in fact inconsistent with the SPW. So I’ll argue that generalized epiphenomenalism does have some seriously worrying consequences after all

I argue that Daniel Dennett's latest book, Consciousness Explained, presents a radically eliminativist view of conscious experience in which experience or, in Dennett's own words, actual phenomenology, becomes a merely intentional object of our own and others? judgments ?about? experience. This strategy of ?intentionalizing? consciousness dovetails nicely with Dennett's background model of brain function: cognitive pandemonium, but does not follow from it. Thus Dennett is driven to a series of independent attacks on the notion of conscious experience, many of which depend upon verificationist premises. I do not directly dispute the appeal to verificationism (though many would, I am sure) but rather aim to show that the sort of verificationist arguments that Dennett employs are fundamentally similar to classical sceptical arguments. The philosophical status of such arguments remains perennially unclear, but none of them produce conviction in their ostensible conclusions. I argue that Dennett's verificationist strategy suffers the same fate

Causation can be regarded from either an explanatory/epistemic or an ontological viewpoint. From the former, emergent features enter into a host of causal relationships which form a hierarchical structure subject to scientific investigation. From the latter, the paramount issue is whether emergent features provide any novel causal powers, or whether the 'go' of the world is exhausted by the fundamental physical features which underlie emergent phenomena. I argue here that the 'Scientific Picture of the World' (SPW) strongly supports the claim that ontological causation is exhausted in the elementary physical features of the world. A method is developed for distinguishing 'emergent ontological causation' from the epistemological emergent explanatory patterns sanctioned by the SPW, and it is argued that the SPW implies that all emergence is mere epistemological emergence. However, this leads to a paradox when applied to consciousness itself, which turns out to be both epiphenomenal and viewpoint dependent

1 Non-reductive physicalists deny that there is any explanation of mentality in purely physical terms, but do not deny that the mental is entirely determined by and constituted out of underlying physical structures. There are important issues about the stability of such a view which teeters on the edge of explanatory reductionism on the one side and dualism on the other (see Kim 1998). 2 Save perhaps for eliminative materialism (see Churchland 1981 for a classic exposition). In fact, however, while.