optic nerve info. wanted

aquila1 at hotmail.com aquila1 at hotmail.com
Wed Jun 17 10:23:46 EST 1998

Mucho grazzi Adriano.

I may ask you some questions at a later date.



In article <358770af.0 at antares.mpc.com.br>,
  "Adriano Botelho" <abotelho at mpcnet.com.br> wrote:
> I suggest you begin with Kandel E, Schwartz R "Principles of Neuroscience"
> 3rd ed. (or would it be Neural Sciences?).
> You want to know exactly HOW the visual information is transduced (from
> light to cell potentials) at the retina and how this information is encoded
> and transmitted through the optic nerve to the cerebral cortex.  It's a
> rather complex system, but I think most, if not all, information coming from
> the retina is in the form of "frequency of action potentials" along the
> nerve's neurons.  The passage from light to those action potentials is
> something really complex.
> Besides the interactions (of the ganglion cells) responsible by the
> receptive fields (including inhibitory activity from specialized cells),
> there are cells more sensitive to some light wavelength, and other cells
> more sensitive to other.
> The entire system is so complex that we study its basic properties, but few
> people test joining all the properties to assemble (computer) models and
> verify whether we know all the necessary properties for it to work or not.
> --
> Abraço/Hug,
> Adriano
> http://www2.mpc.com.br/users/a/abotelho
> ---------------------------------------------------------------------------
> Richard Norman escreveu na mensagem
> <6m3jhl$9j6$1 at denws03.mw.mediaone.net>...
> >In article <6m3f3i$jtp$1 at nnrp1.dejanews.com>, aquila1 at hotmail.com says...
> >>I am working on a little project and need to know information / sources of
> >>information regarding any work done on mapping the axons of the human
> optic
> >>nerve.  Specifically, I need to know everything that happens after an
> image is
> >>processed by the retina.  I.e., is a certain color and frequency and
> spatial
> >>location assigned to each specific axon ?  Any help you can give me is
> greatly
> >>appreciated.  Please don't respond at too technical a level as I am not a
> >>neuroscientist but an amateur.
> >>Thanks,
> >>Sam
> >>samuel.mason at ericsson.com
> >
> >There is an awful lot of stuff on optic nerve fibers, but I am not sure
> >how much specifically on humans.  If you don't wan't too technical an
> >answer, your best bet is first to sit in a good library and browse whatever
> >they have on introductory neurobiology or vision. Also physiology texts
> >also have sections on sensory information processing and vision.
> >Depending on how much background you need, you might even start with a
> >good college level intro biology text to give you the background to read
> >the others.
> >It is hard to know exactly what you want from your question.  You ask
> >about "everything that happens after an image is processed by the retina".
> >That means, everything in the CNS, mostly visual cortex, and that means
> >a lot, indeed.  On the other hand, you ask about axons in the optic nerve,
> >and that means "everything that happens inside the retina".  That is,
> >the information sent to the brain in the optic nerve depends on the
> >circuits in the retina itself, not in the CNS.
> >Your question about "frequency" suggests that the search for data is
> >somewhat confused with the auditory system.  Watch out!  Getting involved
> >in "spatial" frequency analysis is far more technical than you want!
> >What you want is information on the "receptive field" properties of
> >retinal ganglion cells.

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