Fig. 6. Firing rates of (A) a spontaneously active afferent fiber and (B) a silent fiber in response to a prey fish located at variable distances from the neuromast. Both fibers innervated superficial neuromasts. All distances were measured from the insertion point of the nearside prey pectoral fin to the neuromast that was innervated by the recording. The broken horizontal line in A represents the mean spontaneous activity. All firing rates were normalized according to the maximum firing rate elicited by prey movements during each trial. Neural activity was analyzed only when the prey fish was at the same location for greater than 500 ms.