Basic Neuron Questions
johnh at faraway.xxx
Wed Apr 9 00:10:14 EST 2003
At what time scale does the nervous system operate?
Enjoyed the above title, that's some temporal precision.
"Lance Sherman" <lancesherman at insightBB.com> wrote in message
news:PTBka.371204$L1.106250 at sccrnsc02...
> Thanks for your suggested reading
> "Didier A. Depireux" <didier at rai.isr.umd.edu> wrote in message
> news:b6sqfr$1sf$2 at grapevine.wam.umd.edu...
> > Neo <neo55592 at hotmail.com> wrote:
> > > Also, in the cerebral cortex, how common is it for a neuron in a chain
> > > to loop back to the 2nd neuron prior to itself? Suppose N1 -> N2 -> N3
> > > -> N4. Does N3 commonly connect back to N1, does N4 commonly connect
> > > back to N2, etc.
> > I doubt anyone knows the answer to that question in any detail. For any
> > projection, you have a back-projection. For instance, for primary
> > areas, the number of fibers projecting from cortex back to thalamus is
> > 10 times the number of projections from thalamus to cortex (but the
> > projections back to thalamus are thin fibers).
> > We are pretty sure you have a closed look if you include reticulum in
> > loops, but that's not part of neocortex.
> > Look at the article
> > "On the Dimensionality of Cortical Graphs "
> > on
> > http://www.dam.brown.edu/people/elie/publications.html
> > it's an interesting read that addresses your question in a statistical
> > sense.
> > Didier
> > --
> > Didier A Depireux ddepi001 at umaryland.edu didier at isr.umd.edu
> > 685 W.Baltimore Str http://neurobiology.umaryland.edu/depireux.htm
> > Anatomy and Neurobiology Phone: 410-706-1272 (off)
> > University of Maryland -1273 (lab)
> > Baltimore MD 21201 USA Fax: 1-410-706-2512
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