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Electrical stimulation in the medulla of the optic lobe is localized. A, Recorded voltage responses decreased significantly as the distance from the stimulation site increased (400, 800, and 1200 μm) for various stimulation voltages used in the present study. B, Stimulating current was significantly reduced at the site 400 μm away from the stimulation site for various stimulation voltages (400 μm, n = 16; 800 μm, n = 16, 1200 μm, n = 4). Error bars indicate SEM.
