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Fig. 3. Interspike interval (ISI) frequency histograms of primary afferent neurons that innervate dorsal pored (Dp), ventral pored (Vp) and ventral non-pored (Vnp) hyomandibular canal neuromasts in the Atlantic stingray, Dasyatis sabina. Primary afferents that innervate Vnp canals show slower, more variable resting rates than do units from Dp and Vp canals. Also, approximately one-third of units in Vnp canals had no resting discharge (i.e. were silent). These features of the non-pored lateral line primary afferents are consistent with the idea of enhanced detection of transient or phasic stimuli produced by prey. Sample sizes (N) show the number of animals, number of primary afferents sampled.





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