Online research in philosophy

A framework for representing a specific kind of emergent property instance is given. A solution to a generalized version of the exclusion argument is then provided and it is shown that upwards and downwards causation is unproblematical for that kind of emergence. One real example of this kind of emergence is briefly described and the suggestion made that emergence may be more common than current opinions allow.

Philosophical accounts of emergence have been explicated in terms of logical relationships between statements (derivation) or static properties (function and realization). Jaegwon Kim is a modern proponent. A property is emergent if it is not explainable by (or reducible to) the properties of lower level components. This approach, I will argue, is unable to make sense of the kinds of emergence that are widespread in scientific explanations of complex systems. The standard philosophical notion of emergence posits the wrong dichotomies, confuses compositional physicalism with explanatory physicalism, and is unable to represent the type of dynamic processes (self-organizing feedback) that both generate emergent properties and express downward causation.

Note: this paper will serve as a basis for a book-in-progress. Nearly all accounts of emergence take this to involve both broadly synchronic dependence and (some measure of) ontological and causal autonomy. Beyond this agreement, however, accounts of emergence diverge into a bewildering variety, reflecting that the core notions of dependence and autonomy have multiple, often incompatible interpretations. Luckily for philosophical purposes, however, much of this apparent diversity is superficial---or so I argue in this paper. I start by considering a notorious problematic associated with special science entities---namely, the problem of higher-level causation (a generalization of the problem of mental causation). As we will see, of the various strategies for addressing this problem there are two which plausibly accommodate both the dependence and the ontological and causal autonomy of special science entities.

These strategies in turn suggest two distinct schema for metaphysical emergence, which I call 'Weak' and 'Strong' emergence, respectively. The two schema are similar in that each imposes a (different, specific) condition on the powers of entities taken to be emergent, relative to the powers of their dependence base entities. (Importantly, the notion of “power” at issue here is metaphysically almost entirely neutral, primarily reflecting commitment just to the plausible thesis that what causes an entity may---perhaps only contingently---bring about are associated with how the entity is---that is, with its features.) But the conditions, and accounts, are also crucially different; in particular, one is compatible with physicalism, while the other is not. I go on to consider the main accounts of emergent dependence and emergent autonomy, showing how, properly understood and (in some cases) diambiguated, these aim to instantiate one or the other schema.

I discuss here a number of different kinds of diachronic emergence, noting that they differ in important ways from synchronic conceptions. I argue that Bedau’s weak emergence has an essentially historical aspect, in that there can be two indistinguishable states, one of which is weakly emergent, the other of which is not. As a consequence, weak emergence is about tokens, not types, of states. I conclude by examining the question of whether the concept of weak emergence is too weak and note that there is at present no unifying account of diachronic and synchronic concepts of emergence.

A twofold taxonomy for emergence is presented into which a variety of contemporary accounts of emergence fit. The first taxonomy consists of inferential, conceptual, and ontological emergence; the second of diachronic and synchronic emergence. The adequacy of weak emergence, a computational form of inferential emergence, is then examined and its relationship to conceptual emergence and ontological emergence is detailed. †To contact the author, please write to: Corcoran Department of Philosophy, 120 Cocke Hall, University of Virginia, Charlottesville, VA 22904‐4780; e‐mail: pwh2a@virginia.edu.

Weak emergence is the view that a system’s macro properties can be explained by its micro properties but only in an especially complicated way. This paper explains a version of weak emergence based on the notion of explanatory incompressibility and “crawling the causal web.” Then it examines three reasons why weak emergence might be thought to be just in the mind. The first reason is based on contrasting mere epistemological emergence with a form of ontological emergence that involves irreducible downward causation. The second reason is based on the idea that attributions of emergence are always a reflection of our ignorance of non-emergent explanations. The third reason is based on the charge that complex explanations are anthropocentric. Rather than being just in the mind, weak emergence is seen to involve a distinctive kind of complex, macro-pattern in the mind-independent objective micro-causal structure that exists in nature. The paper ends by addressing two further questions. One concerns whether weak emergence applies only or mainly to computer simulations and computational systems. The other concerns the respect in which weak emergence is dynamic rather than static.

The term ‘emergence’ often causes confusion in science and philosophy, as it is used to express at least two quite different concepts. We can label these concepts _strong_ _emergence_ and _weak emergence_. Both of these concepts are important, but it is vital to keep them separate.

Weak emergence has been offered as an explication of the ubiquitous notion of emergence used in complexity science (Bedau 1997). After outlining the problem of emergence and comparing weak emergence with the two other main objectivist approaches to emergence, this paper explains a version of weak emergence and illustrates it with cellular automata. Then it explains the sort of downward causation and explanatory autonomy involved in weak emergence.