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Updated: Apr 4, 2026
Restraint to Induce Stress in Mice and Rats
Published on: December 6, 2024
The Effects of Sex and Chronic Restraint on Instrumental Learning in Rats
Angela L McDowell1, Kathryn M Heath2, Preston E Garraghty3
1Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN 47405, USA ; Program in Neuroscience, Indiana University, Bloomington, IN 47405, USA ; Postdoctoral Associate, Department of Medicine, University of Pittsburgh, 628 NW MUH, 3459 5th Avenue, Pittsburgh, PA 15213, USA.
Chronic stress affects male and female rats differently in learning tasks. Stress impaired male learning but had mixed effects on females, highlighting sex and task-specific stress impacts on goal-directed behavior.
Area of Science:
- Neuroscience
- Behavioral Science
- Animal Models
Background:
- Chronic stress is known to impair cognitive functions, including learning.
- Research on sex differences and task-specific effects of chronic stress on learning is limited.
Purpose of the Study:
- To investigate the impact of chronic stress on instrumental learning in adult male and female rats.
- To examine how sex and task type (appetitive vs. aversive) interact with chronic stress to influence learning.
Main Methods:
- Adult male and female rats were subjected to chronic stress or served as controls.
- Instrumental learning was assessed using aversive and appetitive paradigms, with and without prior appetitive experience.
- Body weight changes were monitored as an indicator of stress.
Main Results:
- Stressed males showed delayed asymptotic performance in instrumental learning tasks.
- Stressed females demonstrated facilitated learning in some tasks but were impaired in others, particularly the aversive transfer task.
- Sex differences were observed in learning efficiency and the impact of prior appetitive experience on aversive learning.
Conclusions:
- Chronic stress exerts differential effects on instrumental learning based on sex and the specific task demands.
- These findings underscore the importance of considering sex and task context when evaluating the neurobiological effects of stress on behavior.
