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Text 319, 138 rader
Skriven 2004-10-05 06:29:00 av Inman Harvey (1:278/230)
Ärende: Re: New Discipline: Synth
=================================


Anthony Cerrato wrote:

> "Tim Tyler" <tim@tt1lock.org> wrote in message
> <snip>
>>>>>[Anthony Cerrato:] I do like
>>>>>this idea of engineering "synthetic" life in a real biological
>>>>>sense.
<snip>
>>>[Anthony Cerrato:] Make no mistake, I am not putting down computer
simulation 
>>>and other techniques in the study of synthetic methods of
>>>various kinds (as a rather old retired analytical chemist I
>>>am very aware of the power and utility of these techniques 
>>>in increasing our knowledge and ability to duplicate/improve
>>>various real world processes.) 

The terms simulation, synthesis and analog have different shades of 
meaning to different people, and I suspect different people in this 
discussion may be using different palettes.

(A) Mathematics has been used in theoretical biology for some 
considerable time.
(B) Computers are a fairly recent tool that allow simulations such as 
agent-based or individual-based models of all sorts of biological 
phenomena, ranging from molecular to cell to genetic to ecological to 
evolutionary to dynamics of motion to ... This is an alternative, or 
supplement to (A)
(C) Quite a few groups build physical robots to test biological 
theories, ranging from insect mate-identification to animal navigation 
to dynamics of motion to ... This is an alternative, or supplement to 
(A) and (B)
(D) Some chemists work on trying to create 'in a test-tube' autopoietic 
cell-like systems, or self-replicating molecules. Labs of people such as 
Pier Luigi Luisi, or Gerald Joyce. This is a different alternative, or 
supplement, to (B) and (C).

Within the Artificial Life community, (B) and (C) and (D) are all 
usually considered exercises in Alife. [I teach a course on Artificial 
Life in the biggest research group in the world in such areas, and my 
colleagues would share this view]
(B) refers to simulations, often referred to as 'not real world'
(C) and (D) are always considered as 'real world'

{AC] I would agree that the
>>>extension of such techniques to biology may well turn out to 
>>>be invaluable in ultimately duplicating the Origin of Life
>>>process(es) in the lab--they certainly will be useful in
>>>studying various aspects of the subject. The only point I 
>>>was making was the following: if some sequential method were 
>>>theoretically developed for an OOL process, using computer

OOL = Origin of Life in this context, I assume?

>>>[AC] models for example, and the method was completely accepted by
>>>biologists through peer review, no one will completely really
>>>believe it until and if it is actually duplicated in real world
>>>labs.  Would you? :))
>>

I fully agree. And the term Artificial Life has always included such 
duplication in real world labs, as Tim Tyler said!

>>[Tim Tyler:] "Artificial life" was /never/ a term confined to computer
> simulations.
>>It has /always/ been a term that referred to man-made organisms -
>>of *all* sorts.
>>
>>Whether the orginsms in question have been in virtual worlds,
>>made from metal, plastic, silicon, fullerenes, molecular
>>nanotechnology - or other material - has never been specified
>>in definitions of the term.

Absolutely right!

<snip>
> [Anthony Cerrato:]
> Dunno 'bout that. Wikpedia:
> http://en.wikipedia.org/wiki/Artificial_life
> 
> gives the following statement:
> 
> "Artificial life, also known as alife, is the study of life
> through
> the use of human-made analogs of living systems. Computer
> scientist Christopher Langton coined the term in the late
> 1980s when he held the first "International Conference on
> the Synthesis and Simulation of Living Systems" (otherwise
> known as Artificial Life I) at the Los Alamos National
> Laboratory in 1987."
> 
> Note the phrase, "...is the study of life through
> the use of human-made analogs of living systems."
> 
> This jibes with my readings which have always only discussed
> alife in terms of electronic or electromechanical/simulation
> or analog techniques, i.e., they do not usually include real
> world or lab biology/synthesis, which was what I was
> speaking of.

Alife has always included (C) and (D), which we always consider as 'real 
world', as well as (C) computer simulations  which are usually not 
considered 'real world'!

> [AC] I also note the following definition (which specifically
> includes the word, "simulation,") given in: The American
> Heritage® Dictionary of the English Language, Fourth Edition
> Copyright © 2000 by Houghton Mifflin Company.
> Published by Houghton Mifflin Company. All rights reserved.
> 
> artificial life
> n.
> The simulation of biological phenomena through the use of
> computer models, robotics, or biochemistry. Also called
> Alife.
> 
> Regards,        ...tonyC
> 

Precisely: through the use of (B) computer models, (C) robotics, or (D) 
biochemistry. If it had said "computer models but NOT robotics or 
biochemistry" it would have supported your position, but your quotation 
clearly and unambiguously supports the point Tim Tyler was making!

Inman Harvey

-- 
Inman Harvey           >>   Evolutionary and Adaptive Systems Group   <<
            >> COGS/Informatics, Univ. of Sussex, Brighton BN1 9QH, UK <<
inmanh@cogs.susx.ac.uk >>   http://www.cogs.susx.ac.uk/users/inmanh/  <<
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