"Dag Stenberg" <dag.stenberg at nospam.helsinki.fi.invalid> wrote in message
news:bum4f1$969$1 at oravannahka.helsinki.fi...
> In bionet.neuroscience Peter F. <effectivespamblock at ozemail.com.au> wrote:
> > Here is something I found:
> > Brain Circuits Underlying Paradoxical Sleep
> > Barbara E. Jones
> > McGill University, Montreal Neurological Institute
> > <snip>
> > Fifth, the PnO reticular neurons give rise to descending projections
into
> > the medullary reticular formation as well as the spinal cord, where
other
> > GABAergic (and glycinergic) neurons are located and participate in the
> > direct inhibition of motor neurons during PS.<snip>
> >
> > Against the hightened excitation during REM sleep, this is at least one
> > specific inhibitiory mechanisms that is "sloppy" as far as our
sight-organ
> > is concerned.
>> The cited paragraph concerns the generalized muscle atonia during REMS,
which
> excepts eye movements and respiration. It limits body and limb movements
> to the fast twitches that presumably are due to overriding vestibular
> nucleus output.
> I do not understand what you try to prove about eye movements by citing
> the paragraph.
I was partly having in mind KC's question:
>> How does the brain feed-forward to the
> retina during dream-sleep?
and that it would hardly be anything more fancy mechanisms than what was
described in the excerpt;
and partly I vaguely thought of this info as a very general background for
my simple evolution theoretical explanation for why (and vaguely how) the
eyes were allowed to be "sloppily inhibited" compared to these other
muscles.
And that it was just another of my self-indulged interjections.
Otherwise not very note-worthy, I am afraid. :->
P
