Received: by alpheratz.cpm.aca.mmu.ac.uk id EAA06300 (8.6.9/5.3[ref pg@gmsl.co.uk] for cpm.aca.mmu.ac.uk from fmb-majordomo@mmu.ac.uk); Wed, 26 Jul 2000 04:36:12 +0100 From: "Chris Lofting" <ddiamond@ozemail.com.au> To: <memetics@mmu.ac.uk> Subject: RE: Simple neural models Date: Wed, 26 Jul 2000 13:51:48 +1000 Message-ID: <LPBBICPHCJJBPJGHGMCIOEKCCHAA.ddiamond@ozemail.com.au> Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2314.1300 In-Reply-To: <4.3.1.0.20000725165641.00c30c70@pop3.htcomp.net> Importance: Normal Sender: fmb-majordomo@mmu.ac.uk Precedence: bulk Reply-To: memetics@mmu.ac.uk
> -----Original Message-----
> From: fmb-majordomo@mmu.ac.uk [mailto:fmb-majordomo@mmu.ac.uk]On Behalf
> Of Mark M. Mills
> Sent: Wednesday, 26 July 2000 8:39
> To: memetics@mmu.ac.uk
> Subject: RE: Simple neural models
>
>
> Derek,
>
> At 11:06 AM 7/25/00 +0200, you wrote:
>
> >Derek:
> >Yes, I can follow that. Either neurotransmitter is released or it isn't.
> >Fair enough.
> >
> >Mark:
> >there is an inherent
> >memory storage system involved. Knowing the 'charge state' at
> one moment,
> >implies knowing the previous state. Voila!, memetic memory.
> >
> >Derek:
> >Here you lose me. Why does the binary state of a nerve cell imply any
> >inherent memory, or memory of any kind?
>
take an XOR gate and feed the output back onto *one* of the inputs and you
have a cyclic system and so a memory mechanism in the form of an idefinite
memory. Holland nicely summarises this in Holland, J.H., (2000) "Emergence :
From Chaos to Order" OUP. You want more 'meat'? get a text on neural nets
etc.
Note that an XOR gate picks up DIFFERENCE rather than SAMENESS and as I have
noted elsewhere our senses are highly tuned to detecting difference and
habituating to sameness.
From a neurological perspective create a neuron with two inputs and an
output with only one input 'up' and the other 'down' to fire. take a loop
back to one of the inputs and hey presto, indefinite memory. The two inputs
can be more, just that the general A XOR B is maintained at the soma firing
position.
To create the XOR you initially need to use feedforward processes, your
basic neural network of in-hidden-out. This system is good for pattern
recognition where you use weights to get the system to learn. Use this
system to create an XOR system and within that use the feedback loop.
Thus feedforward creates the conditions within which you can create an XOR.
Sameness sets the context for processing and remembering difference.
It follows that synchronisation of a set of neurons within a network can
lead to a group memory and so on up the hierarchy...
Best,
Chris.
------------------
Chris Lofting
websites:
http://www.eisa.net.au/~lofting
http://www.ozemail.com.au/~ddiamond
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