Fig. 6.
Steep voltage sensitivity of Im and ΔCm. Continuous recording of Vm, Im, and Cm in a cell that was presented with a series of sinusoidal voltage oscillations (50 Hz, ±5 mV, 10-s duration, 10 s between stimuli) centered at −70, −65, −60, and −55 mV (see also Fig. 7). (Inset) Enlargement of stimulus response (Vm) and current response (Im) around the onset of the −60 ± 5 mV stimulus. The Vm oscillation during the rest period that ends at t = 65 ms appears as a broad black band in Vm and is the result of the 1.5-kHz probe from the lock-in amplifier, which is turned off during the 50-Hz stimulation.