- Aug 19, 2018
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First up, kudos on presenting an argument for free will, as opposed to what we normally get. But firstly...this, from the link:A dual kind of argument that assumes physical determinism and argues to a logical position of semi-decidability is given in my version of this argumentation about self-referencing logic in the above link.
'MacKay's argument might appear to assume deterministic predictions and conclude free will for the agent. Instead it argues from free will by allowing the agent, who is assumed free to choose, to respond to the predictions. It is up to the agent to believe a prediction or not, and such an act of free will determines the truth-value of the prediction. The physical outcome depends on the choice of the agent.'
It is not up to the agent to believe anything. He cannot make a conscious decision to believe something. All he can do is decide whether to accept the evidence for a given proposal or not and then belief, or disbelief, will follow automatically. Let's say that someone says that your wife is being unfaithful because they saw her having coffee with a male work colleague. You probably wouldn't accept that as evidence so therefore wouldn't believe the claim. But if you were shown a video of her in flagrante delicto then you probably would accept that evidence and therefore believe the claim. But you can't accept the evidence and not believe or reject the evidence and believe.
In any case, making a choice (in this case choosing to believe something) is not an example of free will. You make choices whether free will exists or not. The deciding factor is whether the choice was determined by antecedent conditions or not . Not the act of choosing.
The second point is that predicting a choice that someone will make is one of the antecedent conditions that determines your choice. Whether you believe it or not (and you have no choice in believing it or not - it either convinces you or it doesn't) it will determine your decision.
And this from the 'Closure':
'MacKay recognized that we think and behave as though we are free; and he argued that physical determinism does not deny this basic fact of our personal experience.'
I completely agree with that. But...
'The kind of physical determinism that MacKay's argument allows is limited to what can be predicted about A without interacting with A.'
Prediction is not relevant to determinism.
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