Summary
This study challenges the assumption that red light functions as 'darkness' for rodents, finding that isoflurane anesthesia induction in red-tinted chambers did not reduce physiological stress markers and actually increased stress-related behaviors compared to standard translucent chambers. These findings are relevant for laboratory animal welfare lighting design and caution against applying oversimplified assumptions about red light perception to practical settings.
Key Findings
- No significant correlations were found between red-tinted vs. translucent chamber type and physiological stress hormones (norepinephrine, epinephrine, corticosterone) in either mouse strain.
- Significantly higher rearing frequencies were observed in BALB/cJ mice in the red-tinted chamber compared to translucent chambers.
- Higher overall behavioral stress scores were found in BALB/cJ mice and male C57BL/6J mice in the red-tinted chamber.
- More face-wiping behavior was observed across all mice combined in the red-tinted chamber, suggesting red light may increase rather than alleviate stress-related behaviors.
Categories
The Science of Light: Examines the premise that rodents perceive red light as darkness via the primary optic tract, testing whether red-tinted environments reduce stress responses in mice.
Author(s)
MM McKinney, WD Dupont, KJ Corson
Publication Year
2022
Number of Citations
4
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