This paper critically examines the forays into metaphysics of The Dual Nature of Technical Artifacts Program (henceforth, DNP). I argue that the work of DNP is a valuable contribution to the epistemology of certain aspects of artifact design and use, but that it fails to advance a persuasive metaphysic. A central problem is that DNP approaches ontology from within a functionalist framework that is mainly concerned with ascriptions and justified beliefs. Thus, the materiality of artifacts emerges only as the external (...) conditions of realizability of function ascription. The work of DNP has a strong programmatic aspect and much of its foray into metaphysics is tentative, so the intent of my argument is partly synthetic: to sum up these issues as they are presented in the literature and highlight some recognized problems. But I also go beyond that, suggesting that these problems are foundational, arising from the very way in which DNP poses the question of artifact metaphysics. Although it sets out to incorporate objective aspects of technology, DNP places a strong focus on the intentional side of the purported matter-mind duality, bracketing off materiality in an irretrievable manner. Thus, some of the advantages of dualism are lost. I claim that DNP is dualistic, not merely based on “duality”, but that its version of dualism does not appropriately account for the material “nature” of artifacts. The paper ends by suggesting some correctives and alternatives to Dual Nature theory. (shrink)

I offer an explication of the notion of computer, grounded in the practices of computability theorists and computer scientists. I begin by explaining what distinguishes computers from calculators. Then, I offer a systematic taxonomy of kinds of computer, including hard-wired versus programmable, general-purpose versus special-purpose, analog versus digital, and serial versus parallel, giving explicit criteria for each kind. My account is mechanistic: which class a system belongs in, and which functions are computable by which system, depends on the system's mechanistic (...) properties. Finally, I briefly illustrate how my account sheds light on some issues in the history and philosophy of computing as well as the philosophy of mind. (shrink)

We examine to what extent an adequate ontology of technical artefacts can be based on existing general accounts of the relation between higher-order objects and their material basis. We consider two of these accounts: supervenience and constitution. We take as our starting point the thesis that artefacts have a ‘dual nature’, that is, that they are both material bodies and functional objects. We present two criteria for an adequate ontology of artefacts, ‘Underdetermination’ and ‘Realizability Constraints’ , which address aspects of (...) the dual nature thesis. Assessing supervenience accounts, we find them either wanting with respect to these criteria or insufficiently informative. Next, we argue that a recent application of Lynne Rudder Baker’s constitution view to artefacts cannot meet our criteria, although the broader view leaves room for improvement. Based on our evaluation of the most promising candidates, we conclude that so far general metaphysical views fail to address the most salient features of artefacts. Although they can account for the fact that artefacts have a ‘dual nature’, they do not offer the conceptual resources needed to describe the relation between these natures; this relation raises a hard problem in metaphysics.Keywords: Metaphysics; Artefact; Supervenience; Constitution; Underdetermination. (shrink)