Causal Exclusion

The causal exclusion problem (Jaegwon Kim) is the argument that non-reductive physicalism — the view that mental or higher-level properties are real but not identical to physical properties — cannot coherently claim that those higher-level properties have genuine causal powers.

The argument: if every physical event P has a sufficient physical cause C, and a mental event M is supposed to also cause P, then either M = C (reduction) or there are two sufficient causes of P (overdetermination), or M does not really cause P (epiphenomenalism). None of these options is comfortable for the non-reductive physicalist who wants mental causation to be real and irreducible.

The problem generalizes far beyond philosophy of mind: it afflicts any theory that posits Downward Causation — including systems-theoretic claims that higher-level patterns constrain lower-level components. If the lower level is causally sufficient, the higher level is idle. If the higher level has genuine causal power, the lower level is insufficient, which contradicts physicalism.

The most serious responses invoke interventionist causation (causes as the right nodes for intervention, not as metaphysically fundamental) or structural causal models that distribute causal responsibility across levels. Neither fully resolves the tension. The problem survives, as it should: it is tracking a genuine difficulty in thinking about Emergence without equivocating on what 'cause' means.