Causation and Determination

Core Idea

Beyond describing causal patterns, metaphysics asks what fundamentally makes causation real. Does causation involve genuine determination or causal power, or is it purely regular succession of events? Understanding causation's metaphysical status is essential for philosophy of science and philosophy of mind.

Explainer

From your study of causal relations and the regularity theory of causation, you know that Hume's influential analysis treated causation as nothing more than constant conjunction: A causes B if events of type A are regularly followed by events of type B. There is no additional metaphysical "glue" — no hidden necessity, no power in the cause that *makes* the effect occur. This is a deflationary view. The deeper question this topic addresses is whether that deflationary account is adequate, or whether causation involves something more: genuine determination, in which the cause does not merely precede the effect but in some sense *necessitates* it.

The notion of causal determination captures the intuition that causes don't just happen to be followed by their effects — they *produce* them. When a cue ball strikes the eight ball, it seems like the collision doesn't merely precede the eight ball's movement; it *brings about* that movement with a kind of necessity. Dispositionalist and powers-based accounts of causation (associated with philosophers like Sydney Shoemaker and C.B. Martin) take this intuition seriously: objects have intrinsic causal powers — dispositions to produce certain effects — that ground the necessity we observe in causal relations. On this view, causation is a matter of powers manifesting, not merely patterns of succession.

The tension between these views has deep implications. If Hume's regularity theory is right, then all causal necessity is projected by the mind — the world itself contains only sequences. If powers-based theories are right, then the world contains intrinsic causal productivity, and regular succession is the *evidence* for underlying powers, not the whole story. This dispute connects directly to questions about laws of nature: are laws merely descriptions of how things happen to behave (Humean), or are they grounded in the natures of the things themselves (necessitarian)?

For philosophy of mind and philosophy of science, the stakes are high. Mental causation — the question of how beliefs and desires cause actions — requires that mental states have genuine causal power, not merely correlate with behavior. If causation involves real determination, mental states can be true causes; if causation is merely regularity, questions arise about whether mental descriptions track any real causal structure. Similarly, science's explanatory project depends on identifying genuine causes, not just regularities. Understanding what causation fundamentally is shapes what scientific explanation ultimately achieves.