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Fig. 9. Effect of object size and lateral distance on bimodal electric images (box
model; skewed current density; optimal uniform skin conductivity). Lateral
distance is measured with respect to object centers. (A) Un-normalized (actual
amplitudes) and (C) normalized (with respect to the caudal peak's amplitude)
electric images produced by three different-sized metal objects located half
way along the fish's body, 4 cm away from the midline: 0.5 cm (blue), 1.1 cm
(green) and 2 cm (red) radius (see inset). Both images are plotted
versus the normalized box model length, in which the rostral side
corresponds to zero. (B) Peak-to-peak potentials of the electric images found
in A as a function of lateral distance away from the fish's midline for the
three different objects (object sizes same as in A; see inset). (D) Delta,
defined as the difference between the rostral and caudal peak locations, found
in either A or C, as a function of lateral distance from the fish's midline
for the three different objects; delta for the 1.1 cm object is shown in A and
C. Black broken lines in B and D show the distance (4 cm away from the fish's
midline) at which the objects were located for the images shown in A and
C.
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