Effects of zolpidem (⋄, α1GABAA-preferring agonist), L-838,417 (□, agonist with functional selectivity for α2GABAA, α3GABAA, and α5GABAA receptors), and diazepam (•, nonselective agonist) on behavior maintained by food presentation that was suppressed by presentation of mild electric shock (n = 4 rhesus monkeys). V, vehicle (50% propylene glycol, 50% saline). *, P <0.05 vs. vehicle, Dunnett's tests.