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- From: samodena@csemail.cropsci.ncsu.edu (S. A. Modena)
- Newsgroups: bionet.info-theory
- Subject: Re: Animate Nature and Noise
- Keywords: info theory isothermal noise physical limit receptors
- Message-ID: <1993Jan28.002335.23981@ncsu.edu>
- Date: 28 Jan 93 00:23:35 GMT
- References: <1993Jan27.062112.13859@ncsu.edu> <1k6igvINNeg0@shelley.u.washington.edu>
- Sender: news@ncsu.edu (USENET News System)
- Organization: Crop Science Dept., NCSU, Raleigh, NC 27695-7620
- Lines: 59
-
- In article <1k6igvINNeg0@shelley.u.washington.edu> venk@stein.u.washington.edu (Venkatesh Murthy) writes:
- >
- >
- >This subject is quite fascinating. Much of the ideas that Steve Block
- >talks about in that nice little review were presented in another review
- >by Bill Bialek in 1987:
- >
- >Bialek, W. 1987. Physical limits to sensation and perception.
- >Annual Reviews in Biophysics and Biophysical Chemistry. 16:455-478.
-
- Yes, that review is EXCELLENT and every Shannonesque biological information
- theorist ought to read it several times. :^) What facinates me is
- that these researchers never once mention Shannon and information
- theory......which I find refreshing because they work at it formulating
- pretty much the *same* questions that Shannon must have as he (mentally)
- worked out the paradox that a signal could be well below the ambient noise
- level, yet be faithfully received....that encoding schemes, mindful of the
- statictical distributions of sources of interference, are more powerful
- than high signal power....that intuitive guesses about the limit of natural
- systems usually quite wrong (in the old sense that resolution limit of
- a receptor array was limited by the physical dimensions of the array
- elements)......of course, Shannon actually wrote about 'a theory of
- communications...in the presence of noise'...and not about information
- theory.
-
- BTW, current trends in DSP (digital signal processing), especially
- statistical analysis of random, non-periodic signals, looks like
- it will illuminate the kind of work Block, Bialek and the other
- sensory people are doing....and probably link in quite will with
- neural nets and fuzzy logic.
-
- >
- >Bialek's review is good, as is Block's.
- >
- >I didn't intend this posting to be so fragmentary. Mostly it was to
- >try and get people to start posting stuff again. Things have been
- >uncomfortably quiet lately :-)
-
- Well, my above thoughts are fragmentary also. :^) But I see that my
- posting brought out a couple of lurkers and it's nice to see that
- others admire this sensory stuff too....
-
- >
- >-Venki Murthy
- >venk@u.washington.edu
-
- Steve
- ---
- +------------------------------------------------------------------+
- | In person: Steve Modena AB4EL |
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