Figure 9. Effect of histamine on olfactory interference.

(A) Proportion of bees that are still releasing the initial PER as a function of the time after the onset of the sucrose feeding. There were three groups of bees: animals injected into the deutocerebrum with 0 mM (control), with 1 mM or with 10 mM of histamine 15 minutes before starting the experiment. The odor (either 1-nonanol or octanal) were presented 15 s after the onset of the sucrose feeding, during 4 s. Other details are as in Figure 1A. (B) Ratio of the “survival rate” of the PER in the Cox regression for bees treated with 0 mM, 1 mM or 10 mM of cimetidine. The data are presented as in figure 1B.