Dose-related stimulation of gastric contractions induced by intracisternal injection of the TRH analogue, RX-77368 in 18-h fasted urethane-anaesthetized rats. After a 30 min basal period, different groups of rats were injected i.c. with either saline or RX-77368 (1.5, 3, 10, 30 and 100 ng) and corpus contractions were recorded for 120 min. Each bar represents the mean±s.e.m. of total AUC of gastric contractions; the number of rats per group is indicated on top of bars; *P<0.05 compared with other doses (ANOVA).