Figure 1.

Choice frequencies (with 5% confidence intervals) of M. stellatarum trained to discriminate a 440 nm light from a 470 nm light, both with the same intensity (grey bars). Test wavelengths and intensities are given under the abscissa. (a) Control test, 120 choices by 12 moths, G-test, p<0.0001. (b) The light of the rewarded wavelength (white bars) was brighter by a factor 10, 120 choices by 12 animals, G-test, p<0.0001. (c) The light of the unrewarded wavelength was brighter by a factor 10 (white bars), 110 choices by 11 animals, G-test, p<0.0001. (d) Test for relative wavelength learning, 110 choices by 11 animals, G-test, p<0.0001.