Figure 3.
A, Current responses of four rods in a linear array (rod locations are shown in B) to a voltage-clamp step (−40 to −80 mV, 0.5 s) in Rod0,0. Rod1,0; Rod2,0; and Rod3,0 were voltage clamped at −40 mV sequentially and the peak values of Ij01 and Ij02 agree with the prediction of the Ohm’s law (see text for statistics). C, Normalized current responses of Rod1,0; Rod2,0; and Rod3,0 exhibited identical waveforms, suggesting that current flow within the coupled array under voltage clamp is linear. D, schematic diagram of internal resistance (ri), coupling resistance (Rj), and junctional currents (Ij) in the four coupled rods.