Fig. 6. ivn stimulation elicits gastric mill rhythms. (A) In preparations without spontaneous gastric mill rhythm, rhythmic ivn stimulation (40 Hz intratrain frequency) elicited a gastric mill rhythm which included activities of LG (lower trace, extracellular recording of lgn), DG (middle trace, extracellular recording of dgn) and gastric motor (GM) neurons (dgn recording and intracellular recording of GM neuron). The gastric mill rhythm lasted for the duration of the stimulation. (Bi) Stimulation period determined the period of the rhythm: plot of gastric mill period over stimulus period. Means of 6N32 animals. Regression line: slope 1.37, R²=0.98. (Bii) Phase plot of the gastric mill motor neurons LG, DG and GM during 40 Hz ivn stimulation with train durations and intertrain intervals of 6 s, respectively. (Biii) Burst durations (left) and mean intraburst spike frequencies (right) of LG, DG and GM neurons (stimulus parameters as in Bii). (C) Entrainment of the gastric mill rhythm. Extracellular recordings of lgn and dgn before (top) and during ivn stimulation. The period of the gastric mill rhythm fell into synchrony with the ivn stimulation; it was entrained. AGR, anterior gastric receptor.