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Fig. 3. Model calibration. (A) 2D field potential surrounding the fish. Top:
experimental data obtained from Assad
(Assad, 1997). Bottom:
simulated values obtained with optimal parameters (including non-uniform skin
conductivity). Color maps represent potential with respect to an electrode
placed laterally to the fish, near its zero-potential line (as in
Fig. 1A). All values below
approx. -7.6 mV have been mapped to dark blue in order to show a better
contrast between the positive and negative regions of the dipolar field
(measured potential in tail region reaches approx. -30 mV). The zero-potential
line is shown in yellow. (B) Un-weighted % error and (C) absolute potential
differences between data and simulated values found in A. Broken lines show
cross-sections at which the potentials are plotted in (D) and (E). Potential
differences in C greater than 5 mV are all mapped to dark red. (D) Potential
along dotted line near head (5 cm caudal from the tip of the head) in B for
model (red) and data (blue). (E) Potential along dotted line near tail (20 cm
caudal from the tip of the head) in B for model (red) and data (blue).
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