Diazepam selectively biases approach during threat-reward conflict while sparing reactive avoidance

Area of Science:

• Neuroscience
• Behavioral Pharmacology
• Animal Models

Background:

• Benzodiazepines are commonly prescribed for anxiety.
• Their precise impact on defensive behaviors amidst competing threats and rewards is not fully understood.
• Understanding these effects is crucial for refining anxiety treatments.

Purpose of the Study:

• To investigate the effects of diazepam on avoidance behavior.
• To examine how diazepam influences the resolution of threat-reward conflicts.
• To assess the impact of diazepam on the re-expression of avoidance after conflict exposure.

Main Methods:

• Utilized a platform-mediated avoidance paradigm in both female and male rats.
• Administered a low dose of diazepam (1 mg/kg) systemically.
• Assessed avoidance memory, conflict resolution, and post-conflict avoidance re-expression.

Main Results:

• Diazepam did not affect avoidance memory when only threat cues were present.
• During threat-reward conflict, diazepam reduced avoidance and increased reward engagement.
• Diazepam impaired post-conflict avoidance re-expression, particularly in males, shifting behavior towards approach.

Conclusions:

• Diazepam promotes approach behavior over avoidance during threat-reward conflicts.
• The drug alters the re-expression of avoidance behavior post-conflict, with sex-dependent differences observed.
• These findings highlight diazepam's role in modulating behavioral allocation in complex motivational states.