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Jessica Wilson (c. 1965–)

Wilson rebuilt the weak/strong distinction so that it says something about the world rather than about our derivations. Where the standing accounts cash emergence epistemically — unpredictability, underivability, surprise — her criteria are stated in terms of causal powers, deliberately knowledge-independent. Weak emergence: the dependent feature has a proper subset of the powers of its base feature — genuinely distinct (not identical to the base), genuinely dependent (no new powers), and compatible with physicalism, since nothing is done that the base could not do. Strong emergence: the dependent feature has at least one power the base lacks — real ontological novelty, and the failure of physicalism if instantiated. The two schemas, she argues, exhaust the metaphysically distinctive options, and every historical account of emergence — British Emergentism, the non-reductive physicalisms, the complexity literature’s working notions — slots under one or the other once its commitments are made explicit. The taxonomy has become the contemporary debate’s reference grid: the claim that there are exactly two ways to be metaphysically emergent, and that most of what science calls emergence is the weak, physicalism-friendly way.

Life

Born around 1965 (estimated from her 1987 BA; no published birth year). Her route into metaphysics ran through mathematics: a BA summa cum laude at UC San Diego (1987), years outside the academy, a first year of doctoral work at Colorado (1994–95), then the PhD at Cornell (2001). William Wilhartz Assistant Professor at Michigan (2002–05); since 2005 at the University of Toronto Scarborough, where she is Professor of Philosophy. Distinguished visiting professor at Edinburgh’s Eidyn Centre (2014–16); with Jonathan Schaffer, recipient of the Phi Beta Kappa Society’s Lebowitz Prize for philosophical achievement (2014). Metaphysical Emergence (Oxford, 2021) is the programme’s book-length statement, gathering two decades of papers into a single framework.

The programme

The powers-based criteria. The framework’s engine is the idea that what a feature is, for purposes of dependence and novelty, is what it can do. The proper-subset strategy answers Kim’s exclusion argument head-on: a weakly emergent feature’s powers are among its base’s powers, so there is no causal competition for the exclusion argument to adjudicate — the higher-level feature is distinct (it is individuated by fewer powers, at a coarser grain) without being a rival. Distinctness without competition is exactly what non-reductive physicalism needed and, on her diagnosis, failed to articulate for thirty years.

Against the epistemic accounts. Her standing objection to simulation-based and unpredictability-based definitions — Bedau’s weak emergence the named target — is that they classify facts about derivation, not about the world: incompressibility can obtain or fail while the metaphysics stays fixed, so an epistemic criterion cannot ground claims about what exists or what causes what. The objection structures the field’s deepest divide (epistemic versus ontological readings), with her side insisting that “emergence” worth the name must be a thesis about reality.

The layered picture as optional. Against Kim from the other side: the exclusion argument presupposes a stratified ontology of levels related by supervenience, and Wilson argues the presupposition is optional — dependence can be framed by powers and grounding without the layer-cake that makes exclusion look forced. The argument’s grip, on her reading, is an artifact of its framework.

Hume’s Dictum and the wider metaphysics. The emergence work sits inside a larger programme assessing Hume’s Dictum — the principle that there are no metaphysically necessary connections between distinct entities — which underwrites much contemporary metaphysics unexamined. Her sustained case: the Dictum lacks the justification its uses assume, and with it loosened, necessary connections between distinct existents (emergence among them) are not ruled out from the armchair. Alongside: fundamental determinables (the argument that determinable properties can be fundamental — against the orthodoxy that only maximally specific properties are), and work on indeterminacy and the metaphysics of science.

The live disputes. Bedau’s side replies that underivability-without-simulation is an objective structural fact and the one the sciences use — the exchange is standing. Friends of strong emergence press that the proper-subset condition makes weak emergence too easy (every determinable would qualify) or not emergence at all (mere abstraction from the base); Wilson’s reply distinguishes the cases by the role of the special sciences’ own taxonomies. And whether the powers framework itself is metaphysically innocent — or smuggles in a contested theory of properties — is pressed by categoricalists about laws. The taxonomy organises the debate; it has not closed it.

Where Wilson stops

The framework classifies; it does not adjudicate instances. Whether anything actual is strongly emergent — whether consciousness, in particular, has a power its base lacks — the framework poses as an empirical-cum-philosophical question and deliberately does not settle; Metaphysical Emergence surveys the candidate cases and leaves the strongest contested. And the framework’s reach is bounded by its currency: features individuated by their powers. What a powers-vocabulary cannot capture — if anything — falls outside the taxonomy by construction, a boundary she treats as the framework’s discipline rather than a defect.

Key works

See also: Kim · Bedau · Chalmers · Broad