Stathis Papaioannou wrote:
> Brent Meeker writes:
>>>It is consistent with Maudlin's paper to say consciousness supervenes on no 
>>>physical activity - i.e. on computation as Platonic object - but it is also 
>>>to say that it supervenes on a recording, or on any physical activity, and 
>>>perhaps if there were no physical universe with at least a single quantum 
>>>there would be no consciousness. Admittedly the latter is inelegant compared 
>>>the "no physical supervenience" idea, but I can't quite see how to eliminate 
>>But note that Maudlin's argument depends on being in a classical world.  The 
>>world in which we live the counterfactuals are always realized with some 
> I assume you are referring to the MWI interpretation, in which the 
> counterfactuals are 
> always realised in some branch with certainty; in a classical world, the 
> counterfactuals 
> are realised with some probability just as in the CI of QM. In any case, I 
> don't see that 
> it makes much difference to the argument. Consider this model of the MWI 
> case. A machine 
> is made up of two parts, a1 and b1, such that a1 is active at a particular 
> time and b1 
> comes into play from an inert state to alter the activity of a1 only if a 
> counterfactual is 
> realised. It seems absurd to say that a1 is conscious when it undergoes some 
> physical
> activity with b1 hovering over it inertly (because the counterfactual is not 
> realised) but not 
> conscious when it undergoes the same activity without b1 in place. But it 
> seems no less 
> absurd to me to say that a1 or a1b1 is conscious with an identical machine 
> next to it, a2b2, 
> in which the counterfactual is realised, but not if a2b2 is not present. For 
> how would a1/a1b1 
> know or care about a2b2, whether in the next room or in another branch of the 
> multiverse?

It's not a question of whether the "counterfactual" occurs.  If it occured it 
wouldn't be counterfactual.  The point is that in QM what occurs depends on 
could have occur but didn't; c.f. quant-ph/9610033, or seach for 
"interaction free measurment".

Brent Meeker
What is particularly curious about quantum theory is that there can
be actual physical effects arising from what philosophers refer to as
counterfactuals – that is, things that might have happened, although
they did not happened.
        --- Roger Penrose

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