Changes in fixed-ratio performance and blood alcohol levels in monkeys

Area of Science:

• Neuroscience
• Pharmacology
• Primate behavior

Background:

• Alcohol consumption can lead to behavioral impairments.
• Understanding the body's adaptation to alcohol is crucial for addiction research.

Purpose of the Study:

• To investigate the effects of repeated alcohol administration on behavior and blood alcohol concentrations in Bonnet monkeys.
• To determine the time course of alcohol's behavioral effects and its clearance from the body.

Main Methods:

• Three female Bonnet monkeys were used, with indwelling venous catheters for blood sampling.
• Animals were trained on a fixed-ratio schedule of food reinforcement.
• Alcohol (5.0 g/kg) or a sucrose control was administered via intubation.
• Blood alcohol concentrations (BACs) were measured every 15 minutes over a 90-minute session.
• Alcohol administrations were separated by 3-day intervals.

Main Results:

• Alcohol administration initially suppressed response rates.
• After five alcohol administrations, response rates gradually returned to baseline levels.
• Concurrently, blood alcohol concentrations (BACs) decreased with repeated exposure.
• Behavioral impairments and changes in BACs showed similar reversibility timelines.

Conclusions:

• Repeated alcohol exposure in Bonnet monkeys leads to tolerance, evidenced by decreased BACs and recovery of behavioral function.
• The findings suggest that the body adapts to alcohol, with behavioral and physiological changes reversing within similar timeframes.