Event Ontology

Core Idea

Events — births, explosions, decisions — seem to be genuine items in our ontology, not reducible to objects or properties alone. The central questions are what events are and when two event-descriptions pick out the same event. Davidson argued that events are individuated by their causes and effects: if two descriptions share all the same causal relations, they name one event. Kim proposed a finer-grained view: events are property exemplifications by objects at times, so the same action can constitute distinct events if it exemplifies distinct properties. The debate matters because causation, action theory, and philosophy of mind all presuppose answers about what events are and how to count them.

How It's Best Learned

Read Davidson's 'The Individuation of Events' alongside Kim's 'Events as Property Exemplifications.' For each account, test it against a case like the assassination of Caesar: how many events occurred — a stabbing, a killing, a political upheaval?

Common Misconceptions

• Events are not just changes; some philosophers treat static states (a ball resting on a table) as events too.
• The coarse-grained vs. fine-grained debate is not merely verbal — it has consequences for how many causes an effect has and whether mental events are identical to physical events.

Explainer

From your study of ontological categories, you know that metaphysics asks what kinds of things exist and how they relate to one another. Objects — tables, electrons, persons — are the most familiar ontological category. But the world also seems to contain events: births, explosions, decisions, collisions, performances. Events are not objects — an explosion is not a thing in the way a table is — yet we refer to them, quantify over them ("three events occurred"), and cite them as causes and effects. Event ontology asks whether events are genuine items in our ontology and, if so, what they are and how to individuate them — that is, when two event-descriptions pick out the same event versus distinct events.

Donald Davidson proposed a coarse-grained theory of event individuation. On his view, events are concrete particulars — like objects, but extended in time rather than (or in addition to) space. The criterion of identity is causal: two event-descriptions pick out the same event if and only if they have exactly the same causes and exactly the same effects. Consider Brutus stabbing Caesar. "The stabbing," "the killing," and "the assassination" all share the same causal history (Brutus's intentions, the political circumstances, the physical motion of the knife) and the same causal consequences (Caesar's death, the political upheaval). By Davidson's criterion, these are three descriptions of one event. The event is individuated by its causal position in history, not by the properties under which it is described. This makes event identity extensional — a matter of causal profile — rather than intensional — a matter of descriptive content.

Jaegwon Kim proposed a fine-grained alternative. On his view, events are property exemplifications: structured triples of an object, a property, and a time — (object, property, time). "Caesar's being stabbed by Brutus" and "Caesar's being killed by Brutus" involve the same object and the same time, but different properties (being stabbed, being killed). Since the property component differs, they are distinct events. Kim's approach multiplies events dramatically: a single physical occurrence can constitute as many distinct events as there are properties exemplified. Where Davidson sees one event under multiple descriptions, Kim sees multiple events sharing a spatio-temporal location.

This is not a merely verbal dispute — the choice between coarse-grained and fine-grained individuation has real consequences for other areas of philosophy. In philosophy of mind, Davidson's view supports the identity theory: if a mental event (a desire for water) and a physical event (a particular pattern of neural firing) share all the same causes and effects, they are the same event described in two vocabularies. Kim's view makes this identity harder to sustain, since "being a desire for water" and "being neural pattern P" are different properties, yielding distinct events. This opens the causal exclusion problem: if the mental event and the physical event are distinct, which one actually causes behavior? The debate over event individuation thus ramifies into foundational questions about the relationship between mind and body, the nature of causation, and how many causes an effect can have.