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EEG and Neorcortical Dynamics: BBS Call for Commentators

Stevan Harnad harnad at flagstaff.Princeton.EDU
Fri Apr 9 19:52:17 EST 1999


        Below is the abstract of a forthcoming BBS target article:

        NEOCORTICAL DYNAMIC FUNCTION AND EEG  by Paul L. Nunez

This article has been accepted for publication in Behavioral and Brain
Sciences (BBS), an international, interdisciplinary journal providing
Open Peer Commentary on important and controversial current research in
the biobehavioral and cognitive sciences.

Commentators must be BBS Associates or nominated by a BBS Associate. To
be considered as a commentator for this article, to suggest other
appropriate commentators, or for information about how to become a BBS
Associate, please send EMAIL by May 14th to:

    bbs at cogsci.soton.ac.uk

    or write to [PLEASE NOTE SLIGHTLY CHANGED ADDRESS]:

    Behavioral and Brain Sciences
    ECS: New Zepler Building
    University of Southampton
    Highfield, Southampton
    SO17 1BJ UNITED KINGDOM

    http://www.princeton.edu/~harnad/bbs/
    http://www.cogsci.soton.ac.uk/bbs/
    ftp://ftp.princeton.edu/pub/harnad/BBS/
    ftp://ftp.cogsci.soton.ac.uk/pub/bbs/
    gopher://gopher.princeton.edu:70/11/.libraries/.pujournals

If you are not a BBS Associate, please send your CV and the name of a
BBS Associate (there are currently over 10,000 worldwide) who is
familiar with your work. All past BBS authors, referees and
commentators are eligible to become BBS Associates.

To help us put together a balanced list of commentators, please give
some indication of the aspects of the topic on which you would bring
your areas of expertise to bear if you were selected as a commentator.
An electronic draft of the full text is available for inspection
with a WWW browser, anonymous ftp or gopher according to the
instructions that follow after the abstract.

_____________________________________________________________

 
        TOWARD A QUANTITATIVE DESCRIPTION OF LARGE SCALE
        NEOCORTICAL DYNAMIC FUNCTION AND EEG.

        Paul L. Nunez

        Permanent Address:
        Brain Physics Group,
        Dept. of Biomedical Engineering,
        Tulane University,
        New Orleans,
        Louisiana 70118
        pnunez at mailhost.tcs.tulane.edu

        Temporary Address (6/98 - 6/00):
        Brain Sciences Institute,
        Swinburne University of Technology,
        400 Burwood Road,
        Melbourne,
        Victoria 3122,
        Australia
        pnunez at mind.scan.swin.edu.au

    ABSTRACT: A conceptual framework for large-scale neocortical dynamic
    behavior is proposed. It is sufficiently general to embrace brain
    theories applied to different experimental designs, spatial scales
    and brain states. This framework, based on the work of many
    scientists, is constructed from anatomical, physiological and EEG
    data. Neocortical dynamics and correlated behavioral/cognitive brain
    states are viewed in the context of partly distinct, but interacting
    local (regionally specific) processes and globally coherent
    dynamics. Local and regional processes (eg, neural networks) are
    enabled by functional segregation; global processes are facilitated
    by functional integration. Global processes can also facilitate
    synchronous activity in remote cell groups (top down) which function
    simultaneously at several different spatial scales. At the same
    time, local processes may help drive (bottom up) macroscopic global
    dynamics observed with EEG (or MEG).

    A specific, physiologically based local/global dynamic theory is
    outlined in the context of this general conceptual framework. It is
    consistent with a body of EEG data and fits naturally within the
    proposed conceptual framework. The theory is incomplete since its
    physiological control parameters are known only approximately. Thus,
    brain state-dependent contributions of local versus global dynamics
    cannot be predicted. It is also neutral on properties of neural
    networks, assumed to be embedded within macroscopic fields.
    Nevertheless, the purely global part of the theory makes
    qualitative, and in a few cases, semi-quantitative predictions of
    the outcomes of several disparate EEG studies in which global
    contributions to the dynamics appear substantial. Experimental data
    are used to obtain a variety of measures of traveling and standing
    wave phenomena, predicted by the pure global theory. The more
    general local/global theory is also proposed as a "meta-theory," a
    suggestion of what large-scale quantitative theories of neocortical
    dynamics may be like when more accurate treatment of local and
    non-linear effects is achieved.
    
    In the proposed local/global theory, the dynamics of excitatory and
    inhibitory synaptic action fields are described. EEG and MEG are
    believed to provide large-scale estimates of modulation of these
    synaptic fields about background levels. Brain state is determined
    by neuromodulatory control parameters. Some states are dominated by
    local cell groups, in which EEG frequencies are due to local
    feedback gains and rise and decay times of post-synaptic potentials.
    Local frequencies vary with brain location. Other states are
    strongly global, with multiple, closely spaced EEG frequencies, but
    identical at each cortical location. Coherence at these frequencies
    is high over large distances. The global mode frequencies are due to
    a combination of delays in cortico-cortical axons and neocortical
    boundary conditions. Many states involve dynamic interactions
    between local networks and the global system, in which case observed
    EEG frequencies may involve "matching" of local resonant frequencies
    with one or more of the global frequencies.
    
    KEYWORDS: EEG, neocortical dynamics, standing waves, functional
    integration, spatial scale, binding problem, synchronization,
    coherence, cell assemblies, limit cycles, pacemakers

____________________________________________________________

To help you decide whether you would be an appropriate commentator for
this article, an electronic draft is retrievable from the World Wide
Web or by anonymous ftp from the US or UK BBS Archive.
Ftp instructions follow below. Please do not prepare a commentary on
this draft. Just let us know, after having inspected it, what relevant
expertise you feel you would bring to bear on what aspect of the
article.

The URLs you can use to get to the BBS Archive:

    http://www.princeton.edu/~harnad/bbs/
    http://www.cogsci.soton.ac.uk/bbs/Archive/bbs.nunez.html
    ftp://ftp.princeton.edu/pub/harnad/BBS/bbs.nunez
    ftp://ftp.cogsci.soton.ac.uk/pub/bbs/Archive/bbs.nunez


         ***  FIVE IMPORTANT ANNOUNCEMENTS  ***

------------------------------------------------------------------
(1) There have been some very important developments in the 
    area of Web archiving of scientific papers very recently.
    Please see:

Science:
           http://www.cogsci.soton.ac.uk/~harnad/science.html
Nature:
           http://www.cogsci.soton.ac.uk/~harnad/nature.html
American Scientist:
           http://www.cogsci.soton.ac.uk/~harnad/amlet.html
Chronicle of Higher Education:
           http://www.chronicle.com/free/v45/i04/04a02901.htm

---------------------------------------------------------------------
(2) All authors in the biobehavioral and cognitive sciences are
    strongly encouraged to archive all their papers (on their
    Home-Servers as well as) on CogPrints:

http://cogprints.soton.ac.uk/

    It is extremely simple to do so and will make all of our papers
    available to all of us everywhere at no cost to anyone.

---------------------------------------------------------------------
(3) BBS has a new policy of accepting submissions electronically.

    Authors can specify whether they would like their submissions
    archived publicly during refereeing in the BBS under-refereeing
    Archive, or in a referees-only, non-public archive.

    Upon acceptance, preprints of final drafts are moved to the
    public BBS Archive:

ftp://ftp.princeton.edu/pub/harnad/BBS/.WWW/index.html
http://www.cogsci.soton.ac.uk/bbs/Archive/

--------------------------------------------------------------------
(4) BBS has expanded its annual page quota and is now appearing
    bimonthly, so the service of Open Peer Commentary can now be be
    offered to more target articles. The BBS refereeing procedure is
    also going to be considerably faster with the new electronic
    submission and processing procedures. Authors are invited to submit
    papers to:

    Email:   bbs at cogsci.soton.ac.uk

    Web:     http://cogprints.soton.ac.uk
             http://bbs.cogsci.soton.ac.uk/

    INSTRUCTIONS FOR AUTHORS:

http://www.princeton.edu/~harnad/bbs/instructions.for.authors.html
http://www.cogsci.soton.ac.uk/bbs/instructions.for.authors.html      

---------------------------------------------------------------------
(5) Call for Book Nominations for BBS Multiple Book Review

    In the past, Behavioral and Brain Sciences (BBS) journal had only
    been able to do 1-2 BBS multiple book treatments per year, because
    of our limited annual page quota. BBS's new expanded page quota
    will make it possible for us to increase the number of books we
    treat per year, so this is an excellent time for BBS Associates and
    biobehavioral/cognitive scientists in general to nominate books you
    would like to see accorded BBS multiple book review.

    (Authors may self-nominate, but books can only be selected on the
    basis of multiple nominations.) It would be very helpful if you
    indicated in what way a BBS Multiple Book Review of the book(s) you
    nominate would be useful to the field (and of course a rich list of
    potential reviewers would be the best evidence of its potential
    impact!).


'`'`'`'`'`'`'`'`'`'`'`'`'`''`'`'`'`'`'`'`'`'`'`'`'`'`'`'`'`'`'`'`'`'`'`'`
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