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.

A paradox is a situation in which two seemingly equally rational lines of thought lead to contradictory conclusions. A moral paradox is a situation where the employment of diverse moral principles, each of which is at least intuitively acceptable to roughly the same degree, leads to radically different moral assessments of one and the same action. In his “Some Paradoxes of Deterrence” Gregory Kavka argues that such moral paradoxes lurk in the concept of deterrence and further that the present world situation of mutual nuclear deterrence may well provide a concrete illustration of these paradoxes. That deterrence can involve paradox may well be true, but what I wish to consider here is whether the case of nuclear deterrence is in fact an instance of “paradoxical deterrence”.

Jerry Fodor has recently proposed a new entry into the list of information based approaches to semantic content aimed at explicating the general notion of representation for both mental states and linguistic tokens. The basic idea is that a token means what causes its production. The burden of the theory is to select the proper cause from the sea of causal influences which aid in generating any token while at the same time avoiding the absurdity of everything's being literally meaningful. I argue that a detailed examination of the theory reveals that neither burden can be successfully shouldered.

Modern representationalism about consciousness (MR) is often conflated with classical representationalism (CR). This chapter discusses CR first in order to highlight the contrast between old and new representationalism and bring out some of the strengths of the latter. It discerns three key projects related to MR. The first is that of determining whether its defining claim, the exhaustion thesis, is true. The second is that of explicating the fundamental difference between phenomenal and nonphenomenal states. The third project is that of developing a theory of representation strong and stable enough to support MR. MR naturally bifurcates into externalist and internalist versions, depending upon the favored theory of mental representation. Many proponents of MR endorse the externalist view. MR is compatible with a range of theories of introspection. Introspection requires a special and sophisticated way of thinking about conscious experience.

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.

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

The ability to observe is the ability to reliably detect, but that is not all observation is. A thermometer reliably detects temperature yet does not observe the temperature, whereas I do, even though in terms of reliability I cannot match the thermometer. An observation is detection accompanied by active classification and, typically, the subsequent formation of opinion. Even when we say of an animal that it can see something we mean more than that it reliably detects things of a certain sort but also that it deals with such things as objects, gauging their usefulness or lack thereof in relation to its interests and to other aspects of the world. This crucial addendum to the notion of observation can be enshrined in slogan: observers are potential believers. This marks the difference between mere detecting mechanisms and observers.The contemporary scientific anti-realism of one such as van Fraassen, which is developed in detail under the label of “constructive empiricism” in van Fraassen (1980), can be characterized in terms of detecting mechanisms.

Although one of the most important and prolific thinkers of all time, Gottfried Wilhelm Leibniz (1646–1716) spent his life as a courtier, wasting time in diplomatic business or preparing documents to shore up claims of lineage or territory for his patrons. He also spent a good deal of time on practical matters of engineering, such as his dreams of a system of windmills that would have ameliorated the chronic flooding of the Harz silver mines, and on his visionary mechanical calculators. Most of his working life was spent in Hannover, pursuing philosophy when he could spare the time from his professional activities, but nonetheless maintaining an astonishing pace of philosophical, mathematical, and scientific writing (of which very little was published in his own lifetime), as well as a relentless correspondence with all the important intellectual figures of his day. When Leibniz died in 1716, his funeral was scandalously insignificant, but time's revenge has been sweet.