Lithium effects on adjunctive alcohol consumption. I: Comparison with adjunctive water consumption

Area of Science:

• Behavioral Neuroscience
• Psychopharmacology

Background:

• Adjunctive behavior, often observed in animal studies, involves the escalation of drinking or other behaviors during intermittent access to a primary reinforcer.
• Lithium chloride is a mood-stabilizing agent with known effects on neurotransmitter systems and fluid balance.

Purpose of the Study:

• To investigate the effects of chronic lithium chloride administration on adjunctive water and alcohol consumption.
• To examine the impact of lithium on the rate of drinking initiation and terminal consumption levels.
• To assess the persistence of adjunctive drinking under extinction conditions.

Main Methods:

• Rats were administered lithium chloride (20 mEq/l) in their drinking water chronically.
• Adjunctive consumption of water and alcohol was measured.
• Drinking rates and terminal consumption levels were analyzed.
• Extinction procedures were implemented to assess the persistence of drinking behavior.

Main Results:

• Lithium chloride administration led to an earlier onset of adjunctive water and alcohol consumption.
• Terminal consumption levels for both liquids were not affected by lithium.
• The rate of increase in drinking, post-initiation, was slower in lithium-treated subjects compared to controls.
• Adjunctive alcohol consumption did not decline during extinction in either group.
• Control subjects showed a decrease in water consumption during extinction, while lithium subjects maintained their intake.

Conclusions:

• Chronic lithium administration influences the initiation and maintenance of adjunctive drinking behaviors.
• Lithium may alter the response to extinction for water consumption, suggesting a role in habit formation or regulation.
• These findings contribute to understanding the psychopharmacological effects of lithium on motivated behaviors.