What Is Event Causation?

Direct Answer

Event-causal libertarianism is the theory that free will is real, incompatible with determinism, and grounded not in the agent as an uncaused cause but in indeterministic events within the agent. On this view, a free action is still caused — by the agent's reasons, desires, beliefs, and character — but it is not deterministically caused. Because the causal process leading to the action is genuinely undetermined at key points, more than one outcome was possible given the same past and laws. The agent's deliberation is not a charade: the outcome of her struggle between competing motives is not fixed in advance.

The key distinction is with agent-causal libertarianism. Agent-causal theory posits the person as a substance-cause that is not caused by anything. Event-causal theory refuses this move: it stays within the ordinary event-causal order, claiming only that the events that produce the action are not deterministic. Robert Kane's version is the most developed. He argues that freedom and responsibility do not require that each free choice be undetermined; they require "ultimate responsibility": the agent must be responsible for anything that is a sufficient cause of her action. This is achieved through "self-forming actions" (SFAs) — those moments of inner conflict in which we form our characters, and which are undetermined. Once the character is formed through SFAs, later choices flow from it deterministically, but the agent is still responsible because she is responsible for the character.

An example clarifies the view. A recovering addict is tempted and struggles between the desire for the drug and the resolve to stay clean. Event-causal libertarianism says that in this genuine inner struggle, the competing neural and motivational processes are undetermined: given the identical past, either resolution was possible. Whichever wins, the resulting choice is caused by the agent's own motives — but not necessitated by them. The struggle is real, the outcome is open, and the choice is the agent's own.

Historical Context

The modern debate about indeterministic freedom begins with William James's "The Dilemma of Determinism" (1884), which defended the "pluralistic" view that real possibilities exist in advance and that free choice introduces novelty into the world. But James did not give a precise mechanism. In the twentieth century, event-causal libertarianism became the naturalistic option: it tries to secure libertarian freedom without violating the scientific picture of a world of events, and without postulating mysterious non-event causes.

Robert Kane's The Significance of Free Will (1996) is the definitive modern statement, developed in dialogue with the Consequence Argument, Frankfurt cases, and the luck objection. Kane's theory was designed to answer the charge that indeterminism makes choice random: by locating indeterminism in the self-forming struggles that build character, he makes the undetermined events part of the agent's own history of self-creation. The theory has dominated the libertarian side of the debate since, and nearly every contemporary libertarian either builds on Kane or argues against him.

Key Arguments & Debates

The argument for event-causal libertarianism has two steps. First, incompatibilism: the Consequence Argument shows that determinism eliminates the ability to do otherwise, and therefore eliminates free will. Second, the event-causal construction: we can secure the required indeterminism without mystery. Indeterminism at the neural level (perhaps supplied by quantum processes amplified in the brain) can leave the outcome of deliberation open while remaining within the causal order. The agent's reasons still shape the odds, and her character still explains why she tends one way; what is missing is only necessity.

The central objection is the luck objection. If the same past and laws are compatible with both choosing A and choosing B, then nothing — not even the agent's character, since it is the same in both branches — explains why A rather than B occurred. The difference looks like luck, and luck cannot ground responsibility. Kane replies that the relevant question is whether the agent is responsible for the action that actually occurred: since it was caused by her efforts and motives, and she is responsible for the character those efforts built, the choice is hers. Critics like Galen Strawson and Derk Pereboom press the deeper point: if the outcome is undetermined, the agent does not control which branch occurs, and without control there is no freedom — the "disappearing agent" objection. Whether Kane's self-forming actions can answer this is the live question of the contemporary debate.

Contemporary Relevance

Event-causal libertarianism is the version of libertarianism that most naturally engages neuroscience, because it makes empirical claims about the brain: self-forming actions should correspond to identifiable moments of genuine neural indeterminacy or conflict. Libet-style experiments and research on decision conflict (such as work on the anterior cingulate cortex during difficult choices) are often cited as candidates for the neural correlates of SFAs. Defenders argue that science cannot rule out indeterminism at the neural scale, since quantum mechanics already provides indeterministic processes; critics respond that quantum noise is random, not agential. The theory also matters for AI ethics: if free will can be grounded in complex event-causal structures, then the difference between human freedom and machine decision may be a matter of degree and structure — with consequences for whether autonomous systems could ever share the moral standing we reserve for agents.

Related Concepts

• Agent Causation: the rival libertarian theory positing the agent as uncaused cause.
• Libertarianism: the family of theories this one belongs to.
• The Consequence Argument: the incompatibilist argument the theory builds on.
• Hard Incompatibilism: the view that event-causal freedom is still not enough.
• Free Will in Neuroscience: the empirical evidence the theory engages.
• Free Will: the broader concept at stake.

Further Learning

• Robert Kane, The Significance of Free Will (1996).
• Stanford Encyclopedia of Philosophy: Incompatibilist (Nondeterministic) Theories of Free Will
• Internet Encyclopedia of Philosophy: Free Will