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Updated: Jul 12, 2026
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Protocol for Studying Extinction of Conditioned Fear in Naturally Cycling Female Rats
Published on: February 23, 2015
Females do not express learned helplessness like males do
Christina Dalla1, Carol Edgecomb, Abigail S Whetstone
1Department of Psychology and Center for Collaborative Neuroscience, Rutgers University, Piscataway, NJ 08854, USA.
Summary
Female rats do not exhibit learned helplessness, a common animal model for depression, unlike male rats. These sex differences in stress response are independent of hormones, questioning the model
Area of Science:
- Neuroscience
- Behavioral Science
- Psychiatry
Background:
- Women exhibit higher rates of stress-related mental disorders like depression compared to men.
- Learned helplessness is a widely used animal model to study depression.
- Existing research indicates sex-based differences in stress responses and mental health outcomes.
Purpose of the Study:
- To investigate sex differences in the learned helplessness animal model of depression.
- To determine if hormonal factors influence these sex differences in helplessness behavior.
- To assess the validity of the learned helplessness model for understanding depression in women.
Main Methods:
- Male and female rats were subjected to controllable or uncontrollable stress (footshocks).
- Following a stress period, all rats were tested on a more difficult escape task.
- Hormonal manipulations (ovariectomy, castration) and perinatal testosterone exposure were assessed for their influence.
Main Results:
- Male rats exposed to uncontrollable stress predominantly displayed learned helplessness.
- Female rats learned to escape regardless of stress controllability, showing no helplessness.
- Sex differences in helplessness were not abolished by adult hormone removal or perinatal testosterone exposure.
Conclusions:
- Learned helplessness behavior in rats shows significant sex differences, with females being resilient.
- These sex differences are independent of gonadal hormones in adulthood and perinatal testosterone exposure.
- The learned helplessness model may not accurately reflect depressive behaviors in women due to observed sex differences in stress response.
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