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Differences in active avoidance behaviour of hypoactive and hyperactive rats subjected to immobilisation stress.

A Chandramohan1, V Srinivasan, D P Thombre

  • 1Department of Physiology, Jawaharlal Institute of Postgraduate Medical Education and Research, Pondicherry.

Indian Journal of Physiology and Pharmacology
|May 4, 1999
PubMed
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Hyperactive rats exhibit superior avoidance learning compared to hypoactive rats. Immobilization stress specifically enhances learning in hypoactive rats, suggesting a dopaminergic mechanism.

Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Psychopharmacology

Background:

  • Open field activity distinguishes Wistar rats into hypoactive and hyperactive groups based on ambulatory and rearing behaviors.
  • Investigating the impact of activity levels on cognitive functions like avoidance learning is crucial for understanding behavioral variations.

Purpose of the Study:

  • To compare the active avoidance learning capabilities of hypoactive and hyperactive Wistar rats.
  • To examine the effects of domperidone and immobilization stress on avoidance learning in both activity groups.

Main Methods:

  • Wistar rats were categorized as hypoactive or hyperactive based on open field activity.
  • Active avoidance learning was assessed using a shuttle box paradigm.
  • The influence of domperidone and immobilization stress on learning was evaluated.

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Main Results:

  • Hyperactive rats demonstrated significantly better acquisition of active avoidance learning than hypoactive rats.
  • Domperidone impaired learning in both hypoactive and hyperactive rats.
  • Immobilization stress facilitated avoidance learning exclusively in the hypoactive group.

Conclusions:

  • Activity levels influence avoidance learning, with hyperactivity being associated with better performance.
  • Immobilization stress selectively enhances avoidance learning in hypoactive rats, potentially through dopaminergic pathways.
  • These findings highlight the complex interplay between stress, dopamine, and learning in different behavioral phenotypes.