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Effect of chlordiazepoxide on the partial reinforcement extinction effect
Pharmacology, Biochemistry, and Behavior
|November 1, 1977
Summary
Chlordiazepoxide did not affect initial learning in rats but slowed the extinction of learned behaviors. This suggests the drug reduces the impact of aversive stimuli during extinction learning.
Area of Science:
- Behavioral neuroscience
- Pharmacology
- Animal learning
Background:
- The partial reinforcement extinction effect (PREE) is a well-documented phenomenon where behaviors learned under partial reinforcement are more resistant to extinction than those learned under continuous reinforcement.
- Understanding the neurobiological mechanisms underlying the PREE is crucial for developing effective treatments for conditions characterized by persistent behaviors.
Purpose of the Study:
- To investigate the effects of chlordiazepoxide on acquisition and extinction of a learned behavior in rats.
- To determine if chlordiazepoxide can attenuate the partial reinforcement extinction effect (PREE).
- To test the hypothesis that chlordiazepoxide reduces the impact of aversive stimuli.
Main Methods:
- Rats were trained to run in a straight alley under either partial or continuous reinforcement schedules.
- Chlordiazepoxide was administered during the acquisition phase only.
- Extinction trials were conducted to measure the rate of response decrement.
- Behavioral responses were recorded and analyzed to assess acquisition and extinction rates.
Main Results:
- Extinction was significantly slower in rats trained under partial reinforcement compared to continuous reinforcement, confirming the PREE.
- Chlordiazepoxide administration during acquisition did not affect the initial learning (acquisition) of the behavior.
- Chlordiazepoxide abolished the partial reinforcement extinction effect, with extinction rates being similar across both reinforcement conditions.
Conclusions:
- Chlordiazepoxide administration during acquisition attenuates the partial reinforcement extinction effect.
- The findings support the hypothesis that chlordiazepoxide acts by reducing the perceived aversiveness of stimuli encountered during extinction.
- This suggests a potential therapeutic role for chlordiazepoxide in conditions involving persistent or compulsive behaviors.