Fig. 7. Bees failed to use the colour and position of the exit hole in a priming compartment to select the colour of a rewarded stimulus. Top shows the training arrangement. The bees' task is to approach the blue panel after passing through the blue exit hole and the yellow panel after passing through the yellow exit hole. Blue- and yellow-rewarded stimuli frequently switched sides. Bottom shows the performance of a group of six bees when passing through the blue exit hole on the left (with which training began) or the yellow exit hole on the right. Over a training period of 79 trials, bees failed to learn to pick the rewarded yellow screen after passing through the yellow exit hole. Bees developed a blue preference that was independent of the exit hole through which they left the priming compartment.