Fig. 3. Peri-stimulus time histograms (bin width 1 s) of the activity of single medial octavolateralis nucleus (MON) units stimulated with a water flow of 15.5 cm s^-1. The horizontal bar below each diagram indicates flow duration. (A) Examples of two units that showed sustained increases (top) and decreases (bottom) in discharge rate as long as the water was flowing. (B) Examples of two units that showed increases (top) and decreases (bottom) in discharge rate that were more strongly pronounced during a transient period shortly after flow onset than for the remaining time of water flow. (C) Example of two units that responded to the onset of water flow with a transient increase (top) or decrease (bottom) in discharge rate.