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Fig. 1. A schematic drawing of the experimental setup. The curarized fish is
resting on the platform adjacent to the agar frame. The stimulus object is
connected to the center axis via the arm. The center axis rotates
via a pulley system connected to a speed-controlled DC motor. The
minimum lateral distance between the stimulus object and fish is controlled by
the position of the entire stimulator, which is positioned outside the
aquarium.