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Evidence for a relationship between cage stereotypies and behavioural disinhibition in laboratory rodents.

Joseph P Garner1, Georgia J Mason

  • 1Department of Animal Science, University of California, One Shields Avenue, Davis 95616, USA. jpgarner@ucdavis.edu

Behavioural Brain Research
|October 19, 2002
PubMed
Summary

Cage stereotypies in animals, like bar-mouthing in bank voles, stem from basal ganglia disinhibition, similar to human disorders. This finding reveals the neural basis of stereotypies and potential animal distress.

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Comparative Psychology

Background:

  • Cage stereotypies are common in captive animals, leading to self-injury and reduced reproduction.
  • The underlying mechanisms and neurophysiology of these behaviors remain poorly understood.
  • Human stereotypies are linked to basal ganglia dysfunction, specifically disinhibition of behavioral selection.

Purpose of the Study:

  • To investigate the neurophysiological basis of cage stereotypies in captive animals.
  • To determine if stereotypies in animals share similar mechanisms with human stereotypies.
  • To explore the potential for psychological distress in animals exhibiting stereotypies.

Main Methods:

  • Studied captive bank voles exhibiting stereotypic bar-mouthing behavior.

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  • Assessed behavioral responses related to learning, response timing, and behavioral activation.
  • Correlated stereotypic behavior with signs of altered basal ganglia function.

    • Main Results:

    • Stereotypic bar-mouthing correlated with impaired extinction learning, poor response timing, and hyperactivity.
    • These deficits were interconnected, suggesting a unified deficit in response selection.
    • The findings indicate a striatal disinhibition of response selection, similar to human stereotypies.

    Conclusions:

    • Stereotypic behaviors in captive animals share a neural substrate with human stereotypies, linked to basal ganglia dysfunction.
    • This suggests animals may experience novel psychological distress.
    • Stereotypy could be a confounding factor in animal behavior research.