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wedrifid comments on What do professional philosophers believe, and why? - Less Wrong Discussion
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Sometimes people fight a hypothetical because the hypothetical is problematic. I lean toward two-boxing in Newcomb's problem, basically because I can't not fight this hypothetical. My reasoning is more or less as follows. If the being claiming to be Omega actually exists and can in fact instantly model my mental processes, then I'm almost certainly a simulation. One-boxing would reveal that I know that and risk getting me turned off, making the money in the box rather beside the point, so I two-box. If I'm not a simulation, I don't accept the possibility of Omega existing in the first place, so I two-box. Basically, I think Newcomb's problem is not a particularly useful hypothetical, because I don't see it as predictive of decision-making in other circumstances.
It seems to me that if Omega concludes that you are aware that you are in a simulation based on the fact that you take one box then Omega is systematically wrong when reasoning about a broad class of agents that happens to include all the rational agents (and some others). This is rather a significant flaw in an Omega implementation.
For agents with coherent decision making procedures it is equivalent to playing a Prisoner's Dilemma against a clone of yourself. That is something that feels closer to a real world scenario for some people. It is similarly equivalent to Parfit's Hitch-hiker when said hitch-hiker is at the ATM.
That's why I don't like Newcomb's problem. In a prisoner's dilemma with myself, I'd cooperate (I trust me to cooperate with myself). Throwing Omega in confuses this pointlessly. I suspect if people substituted "God" for "Omega" I'd get more sympathy on this.