# [ExI] ANN question

William Flynn Wallace foozler83 at gmail.com
Wed Mar 15 20:40:29 UTC 2017

```addition - see at bottom

On Wed, Mar 15, 2017 at 3:09 PM, William Flynn Wallace <foozler83 at gmail.com>
wrote:

>
>
> On Wed, Mar 15, 2017 at 2:26 PM, Adrian Tymes <atymes at gmail.com> wrote:
>
>> On Mar 15, 2017 11:00 AM, "William Flynn Wallace" <foozler83 at gmail.com>
>> wrote:
>>
>> On Wed, Mar 15, 2017 at 12:29 AM, Adrian Tymes <atymes at gmail.com> wrote:
>>>
>>> At any given instant, a neuron may either be firing or have a time
>>> until next firing - but a firing is a (mostly) discrete event, with
>>> one firing distinct from the next.
>>>
>>> If it was not distinct - if it was "always firing" - then there would
>>> be no such thing as "speed" of firing.  Rather than toggle on then off
>>> at various rates, it would simply be always on.
>>>
>>
>> ​-------------
>> There is a great deal of controversy about rate of firing, from about 1
>> every 6 seconds to 200 per second, up to a couple of thousand at the
>> fastest (for cortical neurons).  By always firing I meant only that it
>> never rested more than a few seconds at the very most.  Yes, discrete -
>> absolute refractory period.​
>>
>>
>> Right.  And during that refractory period, the output is 0, regardless of
>> how long it will be or has been to the next/previous firing.
>>
>> So, again, that gives three states - not changing speed, slowing,
>> increasing
>>
>>
>> No, two states: firing, or between firings.
>>
>> You are declaring the acceleration to be a state, when the state is more
>> like the current position, and the simplification is that most ANNs don't
>> even consider velocity let alone acceleration.
>>
> ​-------------------​
>
> ​OK, I think we are in agreement:  you and the ANN at looking at the state
> of the neuron at a fixed point in time, and I am looking at it over a
> period of time.  Maybe we need to look at both to understand the neuron
> ​.
>

​addition - come to think of it, whether the neuron is firing or not at a
specific point in time, is a function of where on its body you measure the
chemical exchange;  we know that the spike travels the length of the cell
body, a traveling wave, such that at the receiving end - the dendrite - you
can measure the influx of ions into the body, whereas at its opposite end
nothing is happening yet.  Maybe this makes no difference.  What do I know?

> ​
> ​
>

>
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>>
>
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