Cocaine, social behavior, and alcohol-solution drinking in monkeys

Area of Science:

• Primate behavior
• Neuropharmacology
• Substance abuse research

Background:

• Understanding the behavioral effects of cocaine is crucial for addiction research.
• Group-living dynamics can influence drug responses.
• Previous studies often examine cocaine effects in isolation.

Purpose of the Study:

• To investigate the behavioral impact of cocaine administration in a social setting for group-living male monkeys.
• To assess how social interactions modulate cocaine's effects.
• To document specific behavioral changes induced by varying cocaine doses.

Main Methods:

• Eight group-living male monkeys were administered cocaine hydrochloride at doses ranging from 0 to 3.0 mg/kg.
• Behavioral observations were conducted during individual and group testing sessions.
• Key behaviors monitored included social interactions, feeding, drinking, locomotion, and stereotypies.

Main Results:

• Cocaine suppressed social affiliative behaviors, eating, and drinking.
• Observed effects included stereotypies, hypervigilance, panic-like fleeing, and altered locomotion.
• Aggressiveness and sexual behavior were minimally affected, while posture (lying/sitting) significantly changed.
• A notable adverse event was a cocaine-induced seizure.

Conclusions:

• Cocaine profoundly disrupts social behavior and induces significant behavioral abnormalities in a group-living primate setting.
• The social context appears to exacerbate or reveal specific cocaine-induced behavioral changes.
• These findings highlight the complex neurobehavioral effects of cocaine in a social environment.