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Fig. 1. Experimental setup. 1, experimental animal; 2, styrofoam supporting structure; 3, site of operation; 4, recording electrode(s); 5, sphere and supported rod moving the sphere either anterior to posterior (AP) or posterior to anterior (PA) along the side of the fish; 6, laser for the horizontal light sheet; 7, laser for the vertical light sheet; 8, camera for the horizontal light sheet; 9, underwater camera for the vertical light sheet; 10, water level.