Figure 4.

Effects of natural sensing intervals on afferent spike latency. A, EOD intervals recorded in a behavioral experiment in which a fish discriminated between two objects and then foraged for food. Intervals were short and regular during probing (bracket) and longer and irregular during foraging. B, Afferent first spike latency evoked by a constant EOD amplitude delivered at the natural EOD intervals shown in A. Latency clearly depends on the previous intervals, increasing as EOD interval decreases. D, Latency shifts evoked by small transient increases in EOD amplitude (shown in C) are clear when sensing interval is approximately constant (open rectangle) but can be obscured when sensing intervals vary (shaded rectangle). EOD intervals are the same as shown in A.