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 
>>>consistent 
>>>to say that it supervenes on a recording, or on any physical activity, and 
>>>that 
>>>perhaps if there were no physical universe with at least a single quantum 
>>>state 
>>>there would be no consciousness. Admittedly the latter is inelegant compared 
>>>to 
>>>the "no physical supervenience" idea, but I can't quite see how to eliminate 
>>>it 
>>>completely.
> 
> 
>>But note that Maudlin's argument depends on being in a classical world.  The 
>>quantum 
>>world in which we live the counterfactuals are always realized with some 
>>probability.
> 
> 
> 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 
what 
could have occur but didn't; c.f. quant-ph/9610033, or seach arXiv.org 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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