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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!

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.

ted wrote: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?

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?