On 07 Aug 2016, at 23:14, Brent Meeker wrote:
On 8/7/2016 11:20 AM, Bruno Marchal wrote:
Not necessarily. A digital computer also requires that time be
digitized so that its registers run synchronously. Otherwise "the
state" is ill defined. The finite speed of light means that
spacially separated regions cannot be synchronous. Even if
neurons were only ON or OFF, which they aren't, they have
frequency modulation, they are not synchronous.
Synchronous digital machine can emulate asynchronous digital
machine, and that is all what is needed for the reasoning.
If the time variable is continuous, i.e. can't be digitized, I don't
think you are correct.
Nothing in physics needs to be digital for the computationalist
hypothesis to be true. In fact, the FPI suggest that the physical must
have continuous parts, although I have some doubt it could be space or
time.
Then, if the brain exploits a continuum which would be not FPI-
recoverable, then we are out of the scope of the computationalist
theory. Keep in mind that it is my working hypothesis.
Now, like Stathis just said, if the brain exploits the continuum,
evolution, mind, and many things get harder to explain. Biology
illustrates that nature exploits a lot redundancy, which would be
impossible if we need all decimal exact in the continuous relations.
Bruno
Brent
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