Figure 1.

(A) Proboscis extension responses by honeybees during conditioning to two different odors on the two sides (A+/B+ training). Responses developed identically on both sides, eventually reaching ∼75% responses (NS: nonsignificant, log-linear analysis). (B) Bees' performances during the test phase after A+/B+ training. Bees show an unspecific response pattern, responding with a high rate (> 70%) to both odors on both sides. Different letters indicate significantly different levels of responses (pairwise comparisons after Cochran's Q test).