Morphine attenuates ultrasonic vocalization during agonistic encounters in adult male rats

@article{Vivian1993MorphineAU,
  title={Morphine attenuates ultrasonic vocalization during agonistic encounters in adult male rats},
  author={Jeffrey A. Vivian and Klaus A Miczek},
  journal={Psychopharmacology},
  year={1993},
  volume={111},
  pages={367-375}
}
Ultrasonic vocalizations (USV) in rats may communicate “affective” states during pain, sex and aggression. This proposal was evaluated in an experiment with adult male Long-Evans rats during agonistic encounters; specifically, morphine and naltrexone effects were studied on different types of USV by intruder rats exposed to resident attacks and to “threat of attacks” (i.e., intruder residing within the home cage of the resident but prevented from physical contact by a wire mesh cage). Intruders… CONTINUE READING

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