Fig. 6.

Summary of amine effects on the cycle frequency of an isolated AB neuron, an AB–PD subnetwork, an AB–2xPD subnetwork, and an intact pyloric circuit, all with intact descending modulatory inputs. Data shown as percentage relative to control frequencies in each condition. Means of five to eight different preparations ± SEM are shown. An asterisk signifies a significant difference between amines within the same type of preparation. For each amine, bars marked by adifferent letter show statistically significant difference between a single amine-induced change in the different types of preparations; the same letter indicates no significant difference between the different types of preparations.