[Neuroscience] Re: Relationship between current and voltage in an RC circuit

Bill via neur-sci%40net.bio.net (by connelly.bill from gmail.com)
Fri Jun 6 04:34:56 EST 2008


Don't worry I've figured it out.

I was confused because intuitively I could see that the relationship
was going to be something like dV/dt = I/C but I was confused because
that would imply that after the current was turned off, the membrane
voltage would stay perturbed by the current, i.e. it would settle back
down to zero. However I had of course forgotten about the 'leak'
conductances so its more like dV/dt = I(excite)/C - I(leak)/C and of
course, thoses Is would be better replaced with g(V-E).

On Jun 6, 7:44 pm, Bill <connelly.b... from gmail.com> wrote:
> Hi,
>
> I know I'm being dumb here but I can't figure out the relationship
> between the voltage generated over a cell membrane and current
> injected into it. I understand it for a simple square step, but for a
> more complex current function, what is the relationship?



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