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I would like to do something a bit non-standard: I want to implement a synapse model that reads the membrane potential from a compartment other that the one it has been inserted into. Is this possible at all and if so, how would I implement such a mod file?

Ah yes, thanks a lot. That is indeed a much simpler solution!

Best regards,
Willem

Dear Ted, thanks for the clarification. I think I now managed to figure out an (approximate) way to implement the systems of equations that I need. In the example, taking the limit of r2 -> 0 reduces the system of equations you describe to the system of equations that I need. This can be implemented...

Thanks for the quick reply! I'll explain the problem I'm having in more detail with this example: 3 | 1-o-2-o | 4 So in the reduced model, the system of equations I want to implement would be (leaving out the terms for node 1 for simplicity): c_2 dv_2/dt = - g_L2 v_2 + g_23 (v_3 - v_2) + g_24 (v_4 -...

Dear Ted, many thanks for your reply. I actually made a silly mistake and added conductances instead of resistances, the formula in my previous answer should be 1 / g_c = (r_a * L_1/2) / (PI * a_1^2) + (r_a * L_2/2) / (PI * a_2^2). For a simple linear dendrite, I now get the correct results and the ...

Hi Ted, thanks a lot for your answer. Does this mean that the effective coupling conductance between two sections in Neuron (with nseg set to 1 for both) is given by g_c = (PI * a_1^2) / (r_a * L_1/2) + (PI * a_2^2) / (r_a * L_2/2) ? Here a_1, a_2 are the radii of both sections, L_1, L_2 their lengt...

Dear all, I'm looking for a way to implement simplified compartmental models in Neuron. In short, I would like to set coupling conductances between compartments explicitly, without using an actual geometry and axial resistivity (a compartment here would correspond to a single voltage variable, so I ...