That is, we have a clock that counts down to zero. At the moment the clock shows zero, you have t seconds to decide whether to push Button 1 or Button 2, corresponding to the two choices of Newcomb’s problem. At time zero, the machine puts money (or not) into the opaque box according to its prediction of your decision. (If you press both buttons, or neither button, by the time t seconds elapse, then you get nothing.) The value of t is chosen to be small enough so that the machine can reliably predict your choice, but large enough so that you have the subjective impression that you are making your decision *after* the clock reaches zero.

This experiment ought to be feasible with current technology, but I haven’t heard of anyone actually performing it.

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