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Fig. 7. Results of transfer tests with fish 1 (blue) and fish 2 (red), during which
the training objects (pyramid, S+; cube, S–) were replaced by so-called
wire objects of the same outline as the training objects (see text). (A)
Photos of the wire objects (left) and of the wire objects embedded in
electrically transparent agar with interrupted vertical parts (right).
(B–D) Choice frequencies for the pyramid (S+) by fish 1 (blue) and fish
2 (red). Right bars, original training objects; left bars, wire objects (B),
vertically interrupted wire objects (C) and vertically and horizontally
interrupted wire objects (D). Asterisks above each graph indicate significant
differences from random choice conditions: **P<0.01;
n.s., non significant.
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