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Fig. 2. Resting discharge patterns for individual primary afferent neurons that innervate dorsal and ventral hyomandibular lateral line neuromasts in the Atlantic stingray, Dasyatis sabina. Interspike interval (ISI) histograms shown for individual neurons are representative of those recorded from primary afferents in all canal subsystems. Irregular resting discharge patterns were most common (45% of all units) and ISI distributions were similar among dorsal and ventral primary afferents. Regular firing afferents from ventral non-pored canals had slower discharge activity (greater ISI) than those from dorsal pored canals. Histograms were calculated from 500 consecutive spikes and compiled in 2 ms bins. Discharge variability is expressed as the coefficient of variation (CV), which is the dimensionless ratio of S.D. to mean interspike interval.





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