Fig. 3. Results of Expt 1, shape discrimination and generalization between colours. The same bees as in Fig. 2, trained with a blue square vs a yellow square. The inset shows the choice frequency (CF) obtained during the training and the number of choices (N) on which it is based. The trained bees were then offered a choice between a square and each of four novel shapes (abscissa). In the tests, both test shapes were either blue, as was the positive training shape, yellow, as was the negative training shape, or black, which was novel to the bees. The bars depicting the CF obtained in favour of the square are coloured according to the colour of the two shapes used in each test. The number above each bar denotes the total number of choices recorded in the test.