Male researchers stress out rodents

@article{Katsnelson2014MaleRS,
  title={Male researchers stress out rodents},
  author={Alla Katsnelson},
  journal={Nature},
  year={2014}
}
  • A. Katsnelson
  • Published 28 April 2014
  • Biology, Psychology, Education
  • Nature
Rats and mice show increased stress levels when handled by men rather than women, potentially skewing study results. 
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References

Olfactory exposure to males, including men, causes stress and related analgesia in rodents
TLDR
It is found that exposure of mice and rats to male but not female experimenters produces pain inhibition, and experimenter sex can affect apparent baseline responses in behavioral testing.