Diazepam as a discriminative cue: its antagonism by bemegride.

Gerbils trained to respond differentially to the presence or absence of diazepam (8.0 mg/kg) in a T-maze showed a dose-related antagonism when challenged with bemegride (5.0-40.0 mg/kg). Gerbils trained with a mixture of diazepam (8.0 mg/kg) and bemegride (20.0 mg/kg) evidenced response control more slowly than the group trained solely with diazepam.