Re: Questions about a distribution

On 28 Dec 2007 18:13:53 GMT, Scott Seidman
<namdiesttocs@xxxxxxxxxxxxxx> wrote:

Richard Ulrich <Rich.Ulrich@xxxxxxxxxxx> wrote in
news:b5n8n39v3ehpfr3nb1knt24ukqt57lim3q@xxxxxxx:

For folks who are *really fast*, I've wondered how
the time compares to the minimum number of axon
firings.


At some level, yes, but most of the response is overhead. A good portion
of the delay is going to be in vision, where the delay between retina and
Lateral Geniculate Nucleus is probably about 50-100 ms, and that's well
before visual cortex. Then, the brain needs to somehow generate a signal
on primary motor strip, and that process is going to be highly distributed
through big portions of brain. From primary motor strip to muscle, there
will be two synapses, one in spinal cord and one at the muscle, for maybe
4-10ms of delay.

Thanks. "Overhead"? "Head"!

I did not realize or remember that the synapses were that
fast, but I should have recalled that the brain-waves for
recognizing signals at all take a while to show themselves.

- I don't know how much that varies by sense-modality,
or how quick the individual waves *can* be, since EEG data are
typically presented as averages of many trials.

- At big track meets, the dashes are electronically monitored
within the starting-blocks. A false-start is signaled if the first
runner leaves before a sufficient latent period has expired.
(That may be the .1 sec. that was mentioned.)

Thanks again.

--
Rich Ulrich
http://www.pitt.edu/~wpilib/index.html
.

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