Prey Detectibility and Background Sparseness

<div><p>(Left axis, blue trace) SNR ratio between the prey and background transdermal potential time series and the background-only time series (i.e., between blue and green traces in <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.0030038#pcbi-0030038-g005" target="_blank">Figure 5</a>A; see <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.0030038#s4" target="_blank">Materials and Methods</a> for more details). Each point represents the mean SNR of ten locations (over an ~0.01 m–wide patch of skin) centered 0.05 m caudal from the tip of the fish's head. SNR is shown as a function of interobject spacing of the background.</p><p>(Right axis, green trace) Theoretical discriminability (see <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.0030038#s4" target="_blank">Materials and Methods</a>) between two background-type objects as a function of their spacing, using the same object size (2-cm diameter) and lateral distance (0.05 m) as in <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.0030038#pcbi-0030038-g005" target="_blank">Figure 5</a>.</p>