infinite cable

[adamimos]

Hello,

I'm trying to model (at a very simple level), just a passive infinite cable response to a short current injection. I can make the cable very long, which is fine, but then I also want the compartmentalization to be able to capture the dynamics (ie. I need it to be shorter than the electrotonic length). I was wondering if there was a way I could make the compartments smaller near the current injection, and larger farther away.

Thanks!

[ted]

Break it into several different sections, and assign different values to nseg. For practical application, it is generally sufficient to use the d_lambda rule to assign a value to nseg.

[adamimos]

Break it into several different sections, and assign different values to nseg. For practical application, it is generally sufficient to use the d_lambda rule to assign a value to nseg.

i should've thought of just connecting a bunch of sections with different applications. I am not familiar with the d_lambda rule. Is this an option in NEURON i can use or is it an algorithm for me to find some optimal value of nseg?

[ted]

On the FAQ page at www.neuron.yale.edu (link under Documentation) look for the following items:
Why should I use an odd value for nseg?
What's a good strategy for specifying nseg?