On 01 Dec 2008, at 03:25, Russell Standish wrote:

>
> On Sun, Nov 30, 2008 at 07:10:43PM +0100, Bruno Marchal wrote:
>>>
>>> I am speaking as someone unconvinced that MGA2 implies an
>>> absurdity. MGA2 implies that the consciousness is supervening on the
>>> stationary film.
>>
>>
>> ?  I could agree, but is this not absurd enough, given MEC and the
>> definition of the physical superveneience thesis;
>
> It is, prima facie, no more absurd than consciousness supervening on a
> block universe.
>
>>>
>>> A block universe is nondynamic by definition. But looked at another
>>> way, (ie from the inside) it is dynamic. It neatly illustrates why
>>> consciousness can supervene on a stationary film (because it is
>>> stationary when viewed from the inside).
>>
>> OK, but then you clearly change the physical supervenience thesis.
>>
>
> How so? The stationary film is a physical object, I would have  
> thought.


I don't understand this. The physical supervenience thesis associate  
consciousness AT (x,t) to a computational state AT (x,t). The idea is  
that consciousness can be "created" in real time by the physical  
"running" of a computation (viewed of not in a block universe).

With the stationary film, this does not make sense. Alice experience  
of a dream is finite and short, the film lasts as long as you want. I  
think I see what you are doing: you take the stationary film as an  
incarnation of a computation in Platonia. In that sense you can  
associate the platonic experience of Alice to it, but this is a  
different physical supervenience thesis. And I argue that even this  
cannot work, because the movie does not capture a computation. The  
universal interpreter is lacking. It could even correspond to another  
experience, if the graph was a movie of another sort of computer, for  
example with NAND substituted for the NOR.





>
>
>>
>>> The "film", however does need
>>> to be sufficiently rich, and also needs to handle counterfactuals
>>> (unlike the usual sort of movie we see which has only one plot).
>>
>>
>> OK. Such a film could be said to be a computation. Of course you are
>> not talking about a stationary thing, which, be it physical or
>> immaterial, cannot handle counterfactuals.
>>
>
> If true, then a block universe could not represent the
> Multiverse. Maybe so, but I think a lot of people might be surprised
> at this one.


I am not sure I can give sense to an expression like "the multiverse"  
or the "block universe" can or cannot handle counterfactuals. They  
have no inputs, nor outputs.


Bruno
http://iridia.ulb.ac.be/~marchal/




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