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Fig. 4. Choice frequencies of H. erato and V. atalanta for the
four colors after training, as a function of the ratio between the intensities
of the rewarded color and the unrewarded color. The symbols represent the
individual performance and the line the average. (A) Three V.
atalanta trained to 620 nm as the rewarded color and 440 nm as
unrewarded. All choices differ significantly from chance (P<0.05).
(B) The same three butterflies as in A but this time 620 nm as the rewarded
color and 590 as unrewarded. All choices differ significantly from chance
(P<0.05). (C) Nine H. erato trained to 620 nm as the
rewarded color and 590 nm as the unrewarded. The choices of every single
animal differ significantly from chance (P<0.05). (D) The same
nine animals from the previous experiment trained to 620 nm rewarded and 640
nm unrewarded. The choices of butterflies nos. 3, 4, 5 and 6 differ
significantly from chance (P<0.05) at the intensity ratio
0.01.
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