Fig. 11. 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, 2570 and 1530 µm. In still water, the unit responded to the vibrating sphere with an increase in discharge rate. In running water, ongoing discharge rate was decreased. The responses to the vibrating sphere, however, were comparable in still and running water.