Fig. 2.
A: example of spontaneous activity of an afferent neuron (i.e., in the absence of neuromast deflection), as revealed by an extracellular loose patch recording. B: distribution of interspike intervals (ISIs) for the example shown in A shows that the falling part of the distribution follows a single exponential decay rate, which indicates that the pattern of spontaneous firing behaved like a Poisson process. C: ISI return maps, where ISIn (n is an index) is plotted against the preceding ISIn−1, shows that spontaneous spiking had no bursting firing patterns or other well-defined temporal structure.