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Related Experiment Videos

Do infant rats cry?

M S Blumberg1, G Sokoloff

  • 1Department of Psychology, Program in Behavioral and Cognitive Neuroscience, University of Iowa, Iowa City, Iowa 52242, USA. mark-blumberg@uiowa.edu

Psychological Review
|February 24, 2001
PubMed
Summary
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Rat pups

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Area of Science:

  • Animal behavior
  • Mammalian physiology
  • Bioacoustics

Background:

  • Distress vocalizations in mammalian infants are of research interest.
  • Rat pup ultrasonic vocalizations are commonly studied.
  • Previous interpretations focused on communication or distress.

Purpose of the Study:

  • To investigate the cardiovascular origins and effects of rat pup ultrasonic vocalizations.
  • To propose an alternative hypothesis for the function of these vocalizations.

Main Methods:

  • Analysis of cardiovascular parameters during vocalization.
  • Investigation of the abdominal compression reaction (ACR).

Main Results:

  • Rat pup ultrasonic vocalizations may be an acoustic byproduct of the abdominal compression reaction (ACR).
  • The ACR increases venous return to the heart.

    • Conclusions:

    • Rat pup ultrasonic vocalizations might serve a physiological function, similar to a sneeze.
    • This challenges previous interpretations of these vocalizations as solely communicative or distress signals.