<br>
I'd suggest that the people reading this thread go do some googling or
some wiki-ing on precisely how neurons function. In particular
you have several possibilities for time slicing. Slices during
which no atom in the brain effectively moves (neurons electrical
transmission depends on the flow of sodium and potassium ions into and
out of neurons -- no ion flow = no electrical transmission). Then
there is the synapse transmission process which involves (a) the
movement of neurotransmitter vesicles from within an axon terminal to
fuse with the cell membrane and release the neurotransmitter, (b) the
diffusion time of the neurotransmitters across the synapse and (c) the
accumulation of neurotransmitters in sufficient quantity to trigger the
electrical transmission process in the receiving neuron.<br>
<br>
You can calculate the time it takes ions to diffuse across a cell
membrane or the neurontransmitters to diffuse across the synaptic gap
based on the mass of the ions or molecules and the temperature
[1]. See Nanomedicine Vol. I Section 3.2 (it should be online).<br>
<br>
But a better way of dealing with this discussion is to simply agree
with Heartland. Yes, OK, so when I'm frozen or vitrified my
synapses don't release and take up molecules and my axons don't
transmit electrical signals. I'm DEAD! So *what*? If
a majority of what remains of my functioning brain is restored to a
functional condition (or if the information it contains is supplied to
a brain simulator) I have "risen" from the dead. Since I'm I a
reasonable person I can be perfectly happy acknowledging that I was
dead and have subsequently been resurrected.<br>
<br>
Since my resurrected self presumably will be happy to acknowledge, just
as my pre-death self is now, that -- Yes indeed, I was really and truly
'dead' -- I challenge Heartland to propose an argument, other than a
semantic one
of the form "once all your brain activity stops you are dead", that
would convince me that I should really *care* about this. Hell, I
don't care that much if the solar system gets particularly crowded and
I have to be suspended 9 out of every 10 years or 99 out of 100 years
to allow for a couple of orders of magnitude more "minds" to have their
share of the resources available (I presume that there may be groups or
generations of "friends" who may choose to be suspended on synchronized
schedules).<br>
<br>
Robert<br>
<br>
1. Don't hold me to any of this -- its been 15+ years since I took physiology.<br>