This is an analysis of the neural mechanisms of sound avoidance responses triggered by the Mauthner system in fish. The following progress has been made. (1) Behavioral experiments show that goldfish turn away from sound sources predicted by our XNOR version of the phase model: the fish avoids P+/A+ and P-/A- (for impulse sounds in the near field, where P+ = positive pressure, A+ = particle acceleration toward the side ...