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Fig. 9. Increase in relative neural gain to tactile stimulation over hydrodynamic
flow for primary afferent neurons in the ventral non-pored hyomandibular canal
of the stingray, Dasyatis sabina. Mean tactile sensitivity of three
primary afferents from ventral non-pored canals (open circles) normalized
relative to their average response to hydrodynamic flow above the canal (solid
circles at 0 dB) across different stimulus frequencies are shown. Note that
the average neural response is 6–20 dB greater to direct tactile stimuli
compared to hydrodynamic stimuli above the canal, and are highest at the lower
frequencies (10–20 Hz). Thus, non-pored canals are an average of
2–10 times more sensitive to tactile stimuli than to local water
movements. Values are means ± S.E.M.
and error bars are shown only in the negative direction on the 0 dB line for
clarity. The broken line represents a relative neural gain of 6 dB.
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