Related Experiment Video
Updated: Aug 6, 2026
09:03
Handling Techniques to Reduce Stress in Mice
Published on: September 25, 2021
"Isolation stress" revisited: isolation-rearing effects depend on animal care methods
R R Holson1, A C Scallet, S F Ali
1Division of Reproductive and Developmental Toxicology, National Center for Toxicological Research, Jefferson, AR 72079-9502.
Physiology & Behavior
|June 1, 1991
Summary
Rats housed alone in hanging cages showed fear, but this was prevented by handling. This suggests isolation stress is not chronic, but rather a complex interaction of handling and social cues.
Area of Science:
- Neuroscience
- Animal Behavior
Background:
- Early studies linked behavioral changes in isolated rats to "isolation stress."
- Rats reared in individual hanging cages exhibit fear responses and adrenocortical changes.
Purpose of the Study:
- To investigate the underlying causes of the "isolation stress syndrome" in rats.
- To determine if handling and social cues mitigate fear responses in isolated rats.
Main Methods:
- Rats were reared in individual hanging metal cages or plastic cages, with some receiving regular handling.
- Behavioral and adrenocortical responses were assessed during open-field testing.
- Socially housed rats were also tested, with consideration for odor cues.
Main Results:
- Handling prevented fear responses and adrenocortical changes in singly housed rats.
- No evidence of chronic stress (hormonal, neurochemical, anatomical) was found in any isolation group.
- Socially housed rats showed fear responses when tested first from their cage, suggesting odor cues play a role.
Conclusions:
- The "isolation stress syndrome" is not due to chronic stress but a complex interplay of handling, social experience, and testing conditions.
- Handling and familiar social odor cues can prevent fear responses in rats.
- Rearing conditions significantly impact behavioral outcomes in laboratory animals.
