On 2/28/2012 11:38 AM, Stephen P. King wrote:
On 2/28/2012 1:32 PM, meekerdb wrote:
On 2/28/2012 7:43 AM, Quentin Anciaux wrote:
Dear Bruno,
Let me see if my thoughts are correct as I can best write them. COMP is the
conjunction of "Yes Doctor", the Church Thesis and Arithmetic Realism, correct? I am
now not sure of the definition of "Digital physics" given this thread so far... From
what I can tell, Yes Doctor is built on the idea of functional substitutability at
some level or scale for physical systems, such that a given algorithm will run on any
functionally equivalent physical system; it is basically a restatement of
computational universality. This idea shows us that our consciousness is not dependent
on a particular form of physical system if and only if our consciousness is
algorithmic or computable in the Turing sense. I am agnostic on this because I do not
see any evidence (pace Tegmark) that our brain's implementation of consciousness does
not involve quantum entanglement.
This is ambiguous. Tegmark showed that quantum decoherence of ion locations in neural
processes is much faster than neural signaling, therefore brain processing is almost
all classical. It is classical *because* there is quantum entanglement between the
ions and the environment. It is quantum entanglement with an environment (something
with many degrees of freedom) that produces decoherence and classical behavior. If you
substitute for some neurons a silicon chip that is designed to be functionally
identical, that "functionally identical" means it acts as a classical device to
implement a certain computational algorithm. Of course it will be quantum entangled
with its environment because that's what makes it classical.
Maybe you meant you that you think brain processes may involve quantum coherent
superpositions - but that's what Tegmark refuted.
Brent
--
Dear Brent,
Not so fast! Tegmark's argument only holds, if it can be experimentally verified
that is,_only_ for ion transport based processes. Consider theexperimental evidence
<http://newscenter.lbl.gov/feature-stories/2010/05/10/untangling-quantum-entanglement/>
for quantum entanglement in the photosynthesis process in algea, does that not make you
pause just a little bit in making your proclamation?
No. Obviously all processes are quantum, the question is whether neural signaling involves
coherent superpositions.
Brent
Onward!
Stephen
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