Fig. 10. The LP neuron regulates the speed of the pevkinin-modulated pyloric rhythm. (Left) Scatter plot comparing the pyloric cycle frequency when the LP neuron was active and silent, during both saline superfusion (pre-PevK-2, open squares; post-PevK-2, open triangles) and PevK-2 (10^-6 mol l^-1) application (filled circles). The LP neuron was silenced via hyperpolarizing current injection (see Fig. 9). During saline superfusion, suppressing LP neuron activity generally did not alter the mean pyloric cycle frequency. Note that these data points lie along the diagonal, unity line. By contrast, during PevK-2 superfusion, suppressing LP neuron activity consistently increased the pyloric cycle frequency relative to times during the same preparation when the LP neuron was active. (Right) Across preparations, the mean pyloric cycle frequency during saline superfusion was unchanged by suppressing LP neuron activity. However, during PevK-2 application, suppressing LP neuron activity did increase the pyloric cycle frequency. Both examined conditions during PevK-2 application resulted in faster pyloric rhythms than either condition examined during saline superfusion (N=9; ^*P<0.05, ^**P<0.001).