Fig. 5. Influence of AGR on gastric mill motor neurons. (A) Intracellular recordings of the gastric mill neurons GM, LG and DG. Superposition of five sweeps during AGR stimulation, triggered at the beginning of the AGR stimulus. LG and GM were excited during the AGR stimulation, DG received hyperpolarization. (B) In low-Ca²⁺-saline, LG received at least two different types of electrical PSPs. Before and after AGR activity, large PSPs were present (i). During AGR activity, these large PSPs disappeared and small PSPs showed up (ii). During the course of the stimulation, the large PSPs reappeared and elicited action potentials (arrow). Horizontal scale bars in i and ii, 0.2 s; vertical, 1 mV). See text for definition of abbreviations.