Fig. 9. E-afferent response (A) and I-afferent response (B). (Top) Averaged (n=8) vector plots based on particle motions caused by the vortex stimulus. Particle motions were recorded (from left to right) at first, second and third threshold crossing. (Middle) Raster plots of the responses and (bottom) peri-stimulus–time histograms (PSTHs; bin width 20 ms) based on these raster plots. Note that changes in the initial response components from excitation to inhibition are associated with approximate 180° changes in flow direction at the rostro-caudal level of the neuromasts (gray bars on fish schematic). See Fig. 7 for further details.