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Fig. 3. (A) Stimulus signal as a function of time, with a frequency, f=65
Hz. (B) Extracellular receptor potential (ERP) of a neuromast as a function of
time measured in response to the signal shown in A. (C) Spectrum of the ERP
response depicted in B showing the amplitude components as a function of
frequency. The component at twice the stimulus frequency (2f=130 Hz)
clearly dominates the fundamental component (f=65 Hz) and is taken as
the ERP amplitude. (D) Measured amplitude of the ERP (2f component)
as a function of cupular displacement (data points taken from
van Netten, 1987). The
non-linear model (solid line) is given by Eqn 4, with fitted parameters
g=37±3, n=1.7±0.2 and c=34±2.
(E) ERP as a function of location along the lateral line s, simulated
using the nonlinear function (Eqn 4) depicted in D, applied to the pressure
gradient profile calculated from the linear combination of the wavelets shown
in Fig. 2C (d=10 mm),
corresponding to 
=8°. S denotes the distance between the
zeros, and u is given by Eqn 4.
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