© Michael Lacewing Determinism: varieties Michael Lacewing
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Transcript of © Michael Lacewing Determinism: varieties Michael Lacewing
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Determinism defined• Syllabus: ‘the belief that a determinate set
of conditions can only produce one possible outcome given fixed laws of nature’
• Universal causation: every event – everything that happens or occurs – has a cause– Even if we don’t know the cause, we don’t allow
that something ‘just happened’• Causal necessity: given the total set of
conditions under which the cause occurs, only one effect is possible
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Causal necessity• Regularity: the same cause will operate in
the same way on different occasions (laws of nature)
• If the usual effect fails to follow, there must be something different about the situation
• We need to consider anything that could have an effect. The situation in which effect must follow cause is the entire state of the universe at that moment.
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Physical determinism• Everything that happens in the physical
universe is causally determined by the state of the universe + laws of nature.– E.g. every decision is determined by the
previous state of my brain• If we could know the position of every
particle in the universe + the laws of nature, every future physical event could be predicted in principle.– E.g. every movement of your body
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Prediction and freedom
• Being able to predict what someone will do isn’t enough to show that they aren’t free.– Preferences– Character traits
• It depends on whether the basis for prediction rules out the possibility that a different action can’t happen.
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Hard determinism and libertarianism
• Agree: If physical determinism is true, we do not have free will.
• Hard determinism: Physical determinism is true. Therefore, we do not have free will.
• Libertarianism: We have free will. Therefore, physical determinism is false.
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Chance and determinism
• Chaos theory: a tiny change in cause can have a big effect– This is not only compatible with determinism, it
depends on it!• Quantum mechanics
– Theory about sub-atomic particles– Some believe there is genuine randomness at this
level, or that quantum states are not determinate– E.g. Heisenberg’s Uncertainty Principle: you cannot
accurately measure the velocity and position of an electron simultaneously - is this because it doesn’t have a precise velocity/position until measured?
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Chance and determinism
• Other physicists reject indeterminacy as ‘out there’; Schrodinger’s equation shows that sub-atomic states change with perfect regularity
• Some say that the randomness and indeterminacy reflects limitations on our knowledge
• In any case, quantum indeterminacy does not affect the supra-atomic level