Fig. 3.
Passive cable response to constant input current. Responses without ephaptic coupling (κ = 0) are shown with dashed line; responses with ephaptic coupling (κ = 1) are shown with solid line. A: input location is near 1 end of cable. B: steady-state depolarization of population-averaged Vm. C: steady-state V̂m response of “test neuron” that is coupled to population of cables via the extracellular voltage. Vm in B and C are plotted as deviations from resting potential. D: steady-state Ve response produced by population of cables. x-Axis in all panels is distance along the cable normalized by the cable space constant λ (half the physical length of the cable).