Figure 3. Memory retention after exposure to scented food.

Prior to tests, caged adult bees were fed a constant reward program of unscented 15% w/w sucrose solution. Either at 7 days old (A) or 14 days old (B), percentage of bees that extended their proboscis upon the first presentation of an odor (% PER) was calculated for: the solution odor (linalool, LIO, gray bars), a novel test odor (phenylacetaldehyde, PHE, dark gray bars), or both (white bars) in bees that were fed for 24 hours with a scented 15% w/w sucrose solution. Asterisks indicate statistical differences (G-test for, ** p<0.01; for details see the text). The number of observations is shown in parentheses.