Persistent Threat Avoidance Following Negative Reinforcement Is Not Associated with Elevated State Anxiety.

Area of Science:

• Neuroscience
• Behavioral Science
• Psychiatry

Background:

• Obsessive-compulsive disorder (OCD) involves obsessions and compulsions, often linked to avoidant behaviors that manage anxiety.
• The precise role of avoidance in OCD development and its interaction with anxiety states remains unclear.

Purpose of the Study:

• To develop and validate an instrumental negative reinforcement paradigm for studying active avoidance in mice.
• To explore the relationship between negative reinforcement history, anxiety behaviors, and neural correlates of avoidance learning.

Main Methods:

• An instrumental negative reinforcement task was designed where mice learned to press a lever to avoid footshocks.
• Behavioral acquisition, stability under uncertainty, and response patterns were assessed.
• Exploratory analysis of immediate early gene c-Fos expression identified active brain regions.

Main Results:

• Mice demonstrated high acquisition rates (75%) and stable active avoidance learning, even with task modifications.
• Avoidance responses persisted and increased with reinforcement, independent of anxiety assays.
• c-Fos expression correlated with corticostriatal and amygdala circuits implicated in active avoidance and defensive behaviors.

Conclusions:

• The developed mouse model effectively captures active avoidance learning relevant to OCD.
• Negative reinforcement history did not directly correlate with anxiety behaviors in standard assays.
• Corticostriatal and amygdala regions are key neural substrates for well-trained negative reinforcement and active avoidance.