Fig. 10. Responses of a type I medial octavolateralis nucleus (MON) unit to a 50 Hz vibrating sphere stimulus in still (left) and running (15.5 cm s^-1; right) water. Raster plots are as in Fig. 4. Displacement amplitudes were 3700, 890 and 166 µm. In still water, the unit responded to the vibrating sphere with an increase in discharge rate. In running water, the unit exhibited both increased ongoing and increased evoked discharge rates.