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Fig. 2. In order to prove that fish used active electrolocation for object
discrimination, control experiments were conducted with fish 1 (blue) and fish
2 (red), when they were prevented from using other senses. In (A), the
training objects were concealed during test trials within electrically
transparent agar to prevent their tactile (and visual) inspection. In (B),
test trials were conducted under infrared light (invisible for the fish),
which prevented vision. Both fish were trained to choose a pyramid (S+) and
avoid a cube (S–). Choice performances during test conditions (Test) and
during training conditions (Training) are compared. N denotes the
total numbers of choices of fish 1 and fish 2, respectively. Asterisks above
each graph indicate significant differences from random choice conditions;
*P<0.05; **P<0.01.
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