Fig. 3.

R_N of neuron LP2 continuously increased as the steady-state voltage from which current pulses were initiated (V_ssc) was hyperpolarized. R_N was measured by dividing the membrane voltage deflection at the end of each pulse half-cycle (hyperpolarizing and relaxing phases) by pulse current. The tight clustering of points indicates that, at each V_ssc, R_N was stable both within pulse trains and across the 3 stairstep cycles.