Dose-dependent learning impairment induced by allatostatins.

<p>Percentages of forager bees displaying conditioned proboscis extension responses (PER) in the third and last trial of conditioning, in honeybees injected with either vehicle alone (control bees, CT) or a given concentration of allatostatin A (A), C (B), or CC (C). For easier comparisons, <b>l</b>earning performances of control bees are set at 100% and those of all other groups are relative to CT. N = 120–182 (A), N = 70–80 (B) N = 56–87 (C). Significant decreases of learning performance, as compared to those of saline-injected bees, are indicated (*: p<0.05, **:p<0.01, ***:p<0.001).