Fig. 7. Phase diagrams for frequency responses of primary afferent neurons from dorsal pored (Dp) and ventral non-pored (Vnp) hyomandibular canals in the Atlantic stingray, Dasyatis sabina. Dp primary afferents show a low frequency phase lead of about 180° (acceleration-sensitive), while Vnp primary afferents show a low frequency phase lead of about 90° (velocity-sensitive). Phase of the peak neural response is expressed in degrees (mean ± S.E.M.) relative to the peak displacement of the sphere. Sample sizes (N) show the number of animals, number of primary afferents analyzed.