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echo: evolution
to: All
from: Wirt Atmar
date: 2003-10-09 06:15:00
subject: Re: Time: a priori or not

George writes:

>I don't understand the conspiracy here but I accept its humorous
>underside: don't know the names and what each represents and how you
>know that Wirt has replied and more.....

I don't believe any humor or conspiracy was meant to be implied by Bill.

However, your confusion can easily stem from the fact that newsgroup relays are
notorious for dropping individual responses. I see that my response to your
comments, the one that Bill mentioned, didn't make it to Google, or at least
it's not in their archives. However, it did appear on AOL's newsgroup relay and
is present there in its short-term archive. Because of that, I've repeated it
here:

=====================================

George asks:

>A possible (to my knowledge) pathway to that would be the existence of
>oscilators in our brain.
>
>Can any biologist or other knowledgeable person in that area provide
>some knowledge/summary on these oscillators and whether they exist in
>other animals' brains?

Circadian (meaning "about a day") rhythms controlled by
endogenous oscillators
are ubiquitous in the Metazoa, but they occur in plants as well. A collection
of recent references to circadian rhythms in plants appears at:

   http://www.hort.purdue.edu/rhodcv/hort640c/referen/crhythm.htm

For more information on similar oscillators in animals, go to Google and type
"circadian rhythm xxxxx", where "xxxx" is any animal
group that you care to
name, such as "ant" or "bat" or "flatworm."

If you're going to evolve under a yellow sun, resting on a spinning planet that
rotates once every 24 hours, you're going to develop mechanisms to accurately
predict the day/night cycle, no matter what kind of a beast you are.

=====================================

Wirt Atmar
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