Rats use darting as a strategy to navigate between reward and safety during platform-mediated active avoidance under...

Area of Science:

• Neuroscience
• Behavioral Neuroscience
• Animal Behavior

Background:

• The platform-mediated active avoidance (PMA) task models decision-based active avoidance in rodents.
• Prior research focused on avoidance and freezing, with limited investigation into darting behavior as a fear measure in PMA.
• Darting, a measure of fear, is well-studied in conditional fear paradigms but less so in PMA.

Purpose of the Study:

• To investigate the characteristics of darting behavior during the PMA task.
• To compare darting in rats trained alone versus with a social partner.
• To understand darting as a learned navigational strategy within the PMA context.

Main Methods:

• Rats were trained on the PMA task, either individually or with a social partner.
• Darting behavior, including bout frequency, speed, duration, and location, was analyzed.
• Darting trajectories and surrounding movements were examined to understand broader movement strategies.

Main Results:

• Rats in solitary PMA exhibited significantly more darting bouts compared to those in social PMA.
• Socially trained rats produced faster and shorter darting bouts.
• Darting occurred primarily at the platform in solitary PMA, but more frequently outside platform/lever zones in social PMA.

Conclusions:

• Darting in the PMA task represents a learned strategy for navigating between safety (platform) and threat (lever).
• Social context significantly modulates darting behavior, affecting its kinematic properties and spatial distribution.
• These findings differentiate PMA-related darting from escape-like darting seen in auditory fear conditioning.