Anti-conflict effects of diazepam, JY-XHe-053, XHe-II-053 and HZ-166 in rhesus monkeys trained under a multiple schedule of food presentation (non-suppressed responding) and food + shock presentation (suppressed responding). Abscissae, cumulative intravenous dose of drug in mg/kg. Ordinates, response rate as responses per second. Each data point represents the mean (Ā± S.E.M.) from four monkeys. Points above āVā represent data after vehicle administration. Asterisks represent significant differences relative to vehicle for suppressed responding and daggers represent significant differences relative to vehicle for non-suppressed responding (Bonferroni t-tests, p<0.05).