Fig. 2.

Effects of bath-applied amines on the AB and PD neurons. Each neuron was isolated from all pyloric synaptic inputs as described in Materials and Methods. Descending modulatory inputs via the stomatogastric nerve were either blocked (A) or kept intact (B). Both A1 and B1 for the AB neuron, as well as A2 and B2 for the PD neuron, show recordings from a single neuron. Dopamine (DA), serotonin (5HT), and octopamine (OCT) induced fully reversible changes in the cellular activity. The control resting membrane potential or potential at the lowest voltage of oscillations is marked byarrows.