Fig. 8. Bees failed to use a coloured exit hole to select a rewarded stimulus that was in a fixed location. Top shows the training arrangement. The blue and yellow exit holes from the priming compartment led to a further compartment from which the bees entered the flight arena via a centrally placed exit tunnel. The bees' task was to approach the rewarded blue screen when the blue exit hole was open and to approach the yellow screen when the yellow exit hole was open. Bottom shows the performance of a group of six bees during training. At the start of training, the exit tunnel was 24 cm long. When, after 41 trials, it was clear that the bees had acquired the task, the exit tunnel was extended to 42 cm. Performance then broke down and did not recover over a further 55 trials, as shown by the correct and incorrect choice lines which run parallel to or converge upon the random choice line. The vertical lines through the graphs mark when the tunnel was extended.