Effect of d-amphetamine and diazepam on the greeting behavior of rhesus monkeys ( Macaca mulatta)

The greeting behavior of rhesus monkeys ( Macaca mulatta) was evaluated in a pharmacological test. It was observed in pairs of juvenile subjects reunited after a separation of two days. The observational measures were the duration of greeting behavior (social grooming, social play, and huddling) and the frequency of presentations, mounts and solicitations. d-Amphetamine (0.2 and 0.1 mg · kg −1) was found to shorten the duration of greeting behavior and increase the frequency of presentations and mounts. Diazepam (1 and 0.5 mg · kg −1) was found to prolong the duration of greeting behavior.