Female rats adopt a safety-first strategy in a high-conflict platform mediated avoidance task.

Area of Science:

• Neuroscience
• Behavioral Biology
• Psychology

Background:

• Maladaptive avoidance is key in anxiety and stress disorders, which affect women more.
• Sex differences in threat responses are understudied, especially in active avoidance.
• Preclinical research often overlooks females, limiting understanding of neurobiology.

Purpose of the Study:

• Investigate sex-specific strategies in resolving approach-avoidance conflict.
• Examine behavioral differences between male and female rats in a high-conflict task.
• Identify potential neurobiological mechanisms for sex differences in threat responses.

Main Methods:

• Used a platform-mediated avoidance (PMA) task with Long Evans rats (10 female, 9 male).
• Tracked behavior over 25 days, analyzing a stable performance phase (days 20-25) via change point analysis.
• Assessed reward motivation and estrous cycle effects in females.

Main Results:

• Females consistently prioritized safety, spending more time avoiding shock and retreating to safety.
• Males showed persistent reward-seeking despite shock risk, not driven by higher reward motivation.
• Female avoidance strategies were not significantly influenced by the estrous cycle.

Conclusions:

• Male and female rats exhibit distinct strategies for approach-avoidance conflict.
• Females employ a safety-first approach, while males adopt a risk-prone, reward-oriented strategy.
• Understanding these neural mechanisms can guide targeted interventions for anxiety and trauma disorders.