Transdermal Potential at Two Distinct Points on the Fish's Body During Simulated Motion

<div><p>To calculate each image, 21 different fish positions were used. In all cases, images are the raw transdermal potential with the mean removed to more easily compare the different curves. Black arrow shows direction of the simulated scanning motion used to generate the time series shown, with a scanning speed of 0.1 m/s. The legend in (A) applies to all panels.</p><p>(A) Transdermal potential at a skin location 0.11 m caudal from the tip of the fish's head (point A in inset) for three different conditions: background alone (green), the background and prey (blue), and prey alone (red). Background objects are as in <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.0030038#pcbi-0030038-g003" target="_blank">Figures 3</a> and <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.0030038#pcbi-0030038-g004" target="_blank">4</a>. The spacing between the individual objects in the background is 0.03 m; the lateral distance of the background is 0.05 m from the midline. The lateral distance of the prey object (as in <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.0030038#pcbi-0030038-g004" target="_blank">Figure 4</a>) is 0.008 m.</p><p>(B) Same as in panel (A) except for a larger interobject spacing (0.06 m) in the background.</p><p>(C) Same as in panel (A) except that the background objects are randomly spaced, as shown by the inset, with same mean spacing as (B).</p><p>(D–F) Same as the upper panels (A–C, respectively) except that the transdermal potential is shown for a skin position 0.085 m caudal from the tip of the fish's head (point B in inset).</p>