Fig. 2. Results of (A) learning tests and (B,C) Type 1 transfer tests. For each group, the bars show the relative preferences for the four test stimuli when the sample was a star-shaped flower, a circular flower, a plant stem or a landscape, as shown underneath the abscissa. In each panel, N denotes the number of bees that were tested in each experiment. Asterisks denote statistically significant differences from the random choice level of 25% (broken horizontal lines). ^***P<0.001; ^**P<0.01; ^*P<0.05. Black asterisks refer to levels that are significantly greater than 25%, and red asterisks to levels significantly lower than 25%. The circles denote no significant difference from 25%. Values are means ± S.E.M. of the data. In each case, the bees are able to learn to choose the test stimulus that matches the sample.