Fig. 2. Recall is greatest immediately after conditioning, and the rate of memory decay depends on the protocol used for conditioning. The proportion of honey bees responding to the rewarded odor during the first recall test trial at different times after conditioning is shown. (A) Pollen foragers were conditioned using the APC, PC or AC regime and then tested for recall immediately (N_APC=22; N_AC=22; N_PC=21), after 24 h (N_APC=25; N_AC=29; N_PC=24) or 96 h (N_APC=20; N_AC=21; N_PC=19). (B) Nectar foragers were conditioned using one of the three training protocols and were then tested for recall immediately (N_APC=17; N_AC=23; N_PC=23) or 24 h later (N_APC=21; N_AC=26; N_PC=22) or 96 h later (N_APC=22; N_AC=22; N_PC=21). Recall for AC and PC was compared to that for APC using a least-squares contrast at each time point; ^* indicates a difference of P<0.05.