Two main theories of concepts have emerged in the recent psychological literature: the Prototype Theory (which considers concepts to be self-contained lists of features) and the Theory Theory (which conceives of them as being embedded within larger theoretical networks). Experiments supporting the first theory usually differ substantially from those supporting the second, which suggests that these the· ories may be operating at different levels of explanation and dealing with different entities. A convergence is proposed between the Theory Theory and the (...) intentional stance in the philosophy of language and mind. From this stance, concepts should not be thought of as concrete physical entities. (shrink)

Philosophers and historians of science have made the claim that successive scientific theories are incommensurable, that is, that many or all of their concepts fail to coincide. This claim has been echoed by cognitive psychologists who have applied it to the successive conceptual schemes of young children, or of children and adults. This paper examines the psychological evidence for the claim and proposes ways of reinterpreting it which do not involve imputing incommensurability. An alternative approach to understanding conceptual change is (...) suggested, according to which novel concepts are introduced against a background of shared concepts, rather than as part of incommensurable conceptual schemes. (shrink)

Concepts are the means by which we structure our understanding of the world and consequently the primary means by which we encounter it. It is commonly assumed that one of the essential characteristics of concepts – regardless of referent – is their stability, tending toward stasis;and, indeed, it can be hard to see how concepts can otherwise be systematic and productive, inthe way they are conventionally taken to be. Even the question has been raised whether conceptscan change; on some prominent (...) accounts, they cannot. The Unified Conceptual Space Theory – an extension of Conceptual Spaces Theory – makes the controversial claim that conceptsnot only are subject to change over an iterative lifecycle but that, at an underlying level, they are in a state of continuous motion; indeed, they must be to function as they do. Mere openness to change is not enough. Even the most seemingly fixed of concepts – mathematical concepts are the paradigm example – can be seen to evolve and continually be evolving as our understanding of mathematics evolves. UCST suggests that concepts possess an intrinsic tension that appears topresent a contradiction: to be able to apply in more or less the same way across unboundedly many contexts and to be able to combine coherently with other concepts,they must be relatively stable; and yet, since each new application context is, in some nontrivial way, different from every previous context in ways that do not fit within neat conceptual boundaries,they must adapt each time to fit. In a physical world we have reason to view as ultimately one of fluidity, of processes and motion rather than stable entities, concepts should probably have a similar nature. (shrink)

An argument is offered for this conditional: If our current concept conscious state is sharp rather than vague, and also correct , then common versions of familiar metaphysical theories of consciousness are false--?namely versions of the identity theory, functionalism, and dualism that appeal to complex physical or functional properties in identification, realization, or correlation. Reasons are also given for taking seriously the claim that our current concept conscious state is sharp. The paper ends by surveying the theoretical options left open (...) by the concept's sharpness and the truth of the conditional argued for in the paper. (shrink)