home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!rcwusr.bp.com!lakerb
- From: lakerb@rcwusr.bp.com
- Newsgroups: comp.theory.dynamic-sys
- Subject: Re: Refs on chaos in neural activity ?
- Message-ID: <1992Dec23.110835.77@rcwusr>
- Date: 23 Dec 92 11:08:35 -0600
- References: <H.eg.UEnwI&3EHKA@wpcst1.phys-chemie.uni-wuerzburg.dbp.de> <1992Dec21.182154.4670@magnus.acs.ohio-state.edu>
- Organization: BP Research, Cleveland, OH (USA)
- Lines: 39
-
- In article <1992Dec21.182154.4670@magnus.acs.ohio-state.edu>, dcasadon@magnus.acs.ohio-state.edu (Donald J Casadonte) writes:
- ...
- > This is both a hot and cold topic at the moment, in that there is a lot of
- > theory and computer experimentation, but little emperical proof from humans or
- > higher vertebrates. Chaos has been implicated in everything from sense of
- > smell to schizophrenia in the human brain. Brain and Behavior Science spends a
- > lot of time arguing about these topics. There is a lot of solid work on
- > dynamical systems applied to neurobiology, but not a lot yet on chaos, in my
- > opinion.
-
- There is some long-forgotten work using "noise" in a neural system (vertibrate
- [dog]) as the basis for building a quantized model of the adrenocortical
- feedback control system. I don't have the cite at hand, but authors include
- Donald S. Gann, James Schoeffler, and Lee Ostrander. Perhaps the first article
- was in a volume edited by Mijalo Mesarovic, Proc. of the Nth Systems Syposium,
- Cleveland, Ohio, 196X.
-
- The work is/was important in that this may be the first time that a computer
- model told the physiologists where to look for a previously-undiscovered neural
- pathway (a connection between the median eminance of the hypothalamus and the
- adrenal cortex). Several years later, thanks to horseradish peroxidase, this
- pathway was identified and confirmed physiologically.
-
- Dr. Gann is, at last information, now chairing the Department of Surgery at
- Brown University.
-
- <OPINION MODE ON>
- It seems that the chaos-focussed researchers can't see the forest for the
- trees. The "chaos" that is enamoured for its inherent "beauty" may, in fact,
- be conveying a set of signals bearing important information for the control of
- some neural process. Decoding the "chaos" that bears the message is likely to
- be less than fruitful ... the key is the range of the variation in the
- information borne by the "chaos".
- <OPINION MODE OFF>
-
- Robin Lake
- BP Research
- lake@rcwcl1.dnet.bp.com
-
-