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Fig. 1. Schematic representation of the experimental setup. The horizontal
x,y-plane is defined by an x-axis parallel to the lateral
line, along which the position is denoted by s, and a laterally
directed y-axis. A neuromast at position s is stimulated by
a sphere placed at distance r and angle
with respect to the
x-axis. The distance of the sphere from the y-axis is
denoted by b, and the distance from the x-axis (lateral
line) by d. The sphere vibrates (double-arrowed bold line) at an
angle
relative to the x-axis, which corresponds to an angle
between the axis of vibration and the vector pointing to the sphere
position (r). For clearness, the geometry is depicted in relation to
the trunk lateral line system. Actual measurements were done on the cephalic
lateral line system.