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Investigating Pain-Related Avoidance Behavior using a Robotic Arm-Reaching Paradigm

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Published on: October 3, 2020

Vulnerability factors in anxiety determined through differences in active-avoidance behavior.

Kevin D Beck¹, Xilu Jiao, Kevin C H Pang

¹Neurobehavioral Research Laboratory, VA New Jersey Health Care System, East Orange, NJ 07018, United States. beckkd@umdnj.edu

Progress in Neuro-Psychopharmacology & Biological Psychiatry

|April 13, 2010

Summary

Behavioral inhibition and female sex increase anxiety-like behavior in rats. However, these factors do not additively increase the acquisition of avoidance responses, highlighting genetic influences on anxiety vulnerability.

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Using the Threat Probability Task to Assess Anxiety and Fear During Uncertain and Certain Threat

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Published on: September 12, 2014

Area of Science:

Neuroscience
Behavioral Science
Genetics

Background:

Anxiety disorders disproportionately affect females and individuals with behaviorally inhibited temperaments.
Behavioral avoidance predicts anxiety symptom severity, including post-traumatic stress disorder.
Understanding the learning processes underlying avoidant behavior is crucial for modeling anxiety vulnerability.

Purpose of the Study:

To investigate the individual and combined effects of female sex and behaviorally inhibited temperament on the acquisition of active-avoidance responses in an animal model.
To determine if genetic factors (strain and sex) influence the development and persistence of anxiety-related behaviors.

Main Methods:

Utilized a discrete trial lever-press escape-avoidance protocol in Sprague-Dawley (SD) and Wistar-Kyoto (WKY) rats.
Assessed the acquisition of behavioral avoidance, reinforced responses, and non-reinforced responses in male and female rats.
Compared behavioral differences between WKY rats (genetically predisposed to inhibition) and SD rats, and between sexes within each strain.

Main Results:

WKY rats, regardless of sex, acquired reinforced avoidance responses faster than SD rats and emitted more non-reinforced responses.
SD females acquired reinforced responses quicker and emitted more non-reinforced responses than SD males, indicating sex differences in this strain.
Both behavioral inhibition (WKY strain) and female sex were associated with increased avoidant behavior, but their effects were not additive.

Conclusions:

Genetics, specifically strain and sex, plays a significant role in anxiety vulnerability and the acquisition of active-avoidance responses.
Behavioral inhibition and female sex independently contribute to avoidant behaviors, but do not synergistically increase vulnerability.
This study underscores the importance of considering genetic background in animal models of anxiety and avoidance learning.