Abstract
The stomatogastric ganglion (STG) of the spiny lobster Panulirus interruptus produces a triphasic pyloric rhythm which, in the behaving animal, is subject to changes in frequency duty cycle and phase relationships. The pyloric rhythm is driven by a pacemaker ensemble that includes two Pyloric Dilator (PD) neurons. The inhibitory synaptic connection from the Lateral Pyloric (LP) neuron to the PD neurons provides the sole feedback from the rest of the pyloric network to the pacemaker ensemble. This synaptic connection is therefore potentially involved in the regulation of the pyloric rhythm.