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Fig. 8. Results of transfer tests with fish 1 (blue) and fish 2 (red) (A,B) and
fish 4 (C), during which one or two objects were replaced by plastic objects.
In (A), object shapes remained unchanged, while S+ (pyramid), S– (cube)
or both objects were replaced by otherwise identical plastic versions. In (B),
two identically shaped objects (either two S+ or two S–) were offered,
one of which was made of metal and the other one of plastic. In (C), several
combinations of S+ (A) and S– (mushroom) made out of plastic or metal,
respectively, were offered. Numbers in parentheses are the total number of
each fish's choices. Asterisks above each graph indicate significant
differences from random choice conditions: **P<0.01;
n.s., non significant.
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