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Fig. 4. Relationship between mean interspike interval (ISI) and coefficient of
variation (CV) for regular and irregular primary afferent neurons from dorsal
pored (Dp), ventral pored (Vp) and ventral non-pored (Vnp) canals in the
Atlantic stingray, Dasyatis sabina. Primary afferents with regular
discharge activity (Reg; closed symbols) have lower CV values than irregular
units (Irreg; open symbols) for all canal types. ISI values differ between
regular and irregular units for Dp and Vp, but not Vnp primary afferents.
Further, regular Dp afferents have higher CV and lower ISI values than regular
Vnp afferents. Data are plotted as mean ±
S.E.M.