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Fig. 4. Results of Expt 2, shape discrimination and generalization from luminance
contrast to colour contrast and motion contrast. Bees were trained with a
black diamond (positive) versus a black disc (negative) placed
against a white background (inset). (A) The black-and-white bar on the left
shows the choice frequency (CF) obtained during the training. Bees were then
given transfer tests with a diamond vs a disc, which were both either
blue or yellow, again on the white background (blue and yellow bar,
respectively, with a white margin), and with black, blue and yellow shapes
placed on a patterned background (bars with patterned margins). (B) Bees
choosing between the learned diamond and a novel shape, a square, placed on a
white background. The pair of test shapes is black, blue or yellow. (C)
Control tests showing that the bees' choice behaviour constitutes a
generalization performance, as explained in the text. In all three panels, the
total number of choices (N) on which the CFs are based is given above
each bar.
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