From: Matt Mahoney (matmahoney@yahoo.com)
Date: Mon Nov 23 2009 - 17:58:14 MST
Mike Dougherty wrote:
> How much complexity is in the genetic space for the development of a brain? ex: total for all genetic encoding minus the parts about the bloody viscera and redundant so-called junk-DNA =?= less than 10^9 Like you said, nature just needs *a* brain - not an exact replica of a particular brain.
That's for a baby brain. To model an adult brain, you have to add to that all the information learned since then.
-- Matt Mahoney, matmahoney@yahoo.com
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From: Mike Dougherty <msd001@gmail.com>
To: sl4@sl4.org
Sent: Mon, November 23, 2009 6:15:30 PM
Subject: Re: [sl4] The Jaguar Supercomputer
On Mon, Nov 23, 2009 at 11:20 AM, Matt Mahoney <matmahoney@yahoo.com> wrote:
When I say that the brain has 10^9 bits of memory, I mean its Kolmogorov complexity. There are 2^(10^9) possible brains you can distinguish by their behavior. (It happens to take 10^15 synapses to achieve that, however). So the Kolmogorov complexity of the desired outputs for any traning set also has to be at least 10^9 bits, or else there would be some brains that can't be distinguished.
>
>
>If your goal is to produce *a* brain (say, to pass the Turing test), and not a copy of some particular brain, then I suppose you could get by with less.
>
How much complexity is in the genetic space for the development of a brain? ex: total for all genetic encoding minus the parts about the bloody viscera and redundant so-called junk-DNA =?= less than 10^9 Like you said, nature just needs *a* brain - not an exact replica of a particular brain.
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