Causality is the relation in which one event brings about another, while determinism is the view that the state of the universe at one time, together with the laws of nature, fixes every later state. Physical laws can describe causal patterns without proving that the universe is deterministic.
The Reasoning
A causal claim says that one event or condition produces an effect. Philosophers ask whether physical laws reveal necessary connections in reality or merely summarize observations.
David Hume argued that experience reveals only constant conjunction: one type of event repeatedly follows another. We do not perceive a necessary causal power. Expecting the future to resemble the past relies on induction, not deductive certainty.
Under Laplacean determinism, complete knowledge of physical conditions and laws would make the future and past calculable.
| Concept | Central claim | Philosophical issue |
|---|---|---|
| Causality | One event produces or explains another | Is the connection necessary, or only regular? |
| Determinism | Prior conditions and laws fix one possible future | Does this exclude freedom and moral responsibility? |
| Indeterminism | Prior conditions permit several possible outcomes | Does randomness create genuine agency? |
Modern quantum theory challenges simple Laplacean determinism because some interpretations make outcomes fundamentally probabilistic. Probabilistic laws can still be causal by assigning probabilities to effects rather than fixing one result.
This connects to science and the self: if human choices are completely determined by physical causes, free will and moral responsibility become difficult to explain. Compatibilism holds that freedom can mean acting according to one's reasons and desires, even when these have prior causes.
Exam Technique
In an IB Philosophy response, first distinguish causality from determinism, then evaluate their implications for free will. Correct the common misconception that causal explanation automatically entails determinism. Use Hume's challenge to question necessary connection, and use quantum theory cautiously: randomness alone does not prove freedom.
