Fig. 5. IV neuron effects on the pyloric rhythm. (A) Intracellular recordings of PD and LP neurons. The ivn was extracellularly stimulated at 40 Hz. The spike activities of both PD and LP neurons diminished during the stimulus. (B) Mean number of spikes per burst of the pyloric neurons PD, LP, PY, VD (ventricular dilator) and IC (inferior cardiac), and pyloric cycle period before (light gray boxes), during (open boxes) and after stimulation (dark gray boxes). ^*P<0.05, ^***P<0.001, significantly different from pre- and post-control (ANOVA).