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Discrimination performance of the visually trained fish (fish 1–5) in complete darkness with (red) and without (dark red) agarose cubes encasing the aluminum objects. These control tests were conducted to exclude influences of the agarose cubes on the discrimination performance during the electrical tests. The exact Fisher test showed no significant differences between both conditions (n.s.: P > 0.05). For further description, see Fig. 1.
