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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.