Controls and ampullary recordings. A, B. Box-and-Whisker plots showing the latency (A) and the amplitude (B) of the SOR for a single fish presented with changes in capacitance of the dipole-object (white bars, n = 34 stimuli), and mean data of four fishes where stimuli consisted of changes in object resistance (32 stimuli). C. Ongoing discharge rate of an ampullary receptor in response to changes in resistance (C1), capacitance (C2) and in response to the control stimuli (no change, C3). Note that the receptor responds with a transient increase in spike rate only to a change in object resistance and that this response is strongest for the return to the shunted dipole-object. The inset in C1 shows a short spike sequence.