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Choice frequencies (with 5% confidence intervals) of M. stellatarum trained to discriminate two stimuli differing in both intensity and wavelength. (a) Control test with the training stimuli; 130 choices by 13 animals, G-test, p<0.0001. (b) When the correct intensity was paired with the incorrect wavelength and vice versa, moths chose the correct wavelength; 130 choices by 13 animals, G-test, p<0.0001.
