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Sustained stress and fixed interval performance

G J Kant1, R A Bauman, J J Widholm

  • 1Division of Neurosciences, Walter Reed Army Institute of Research, Washington, DC 20307-5100, USA.

Physiology & Behavior
|February 1, 1997
PubMed
Summary
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Sustained stress significantly impairs rats' response rate and temporal patterning in learned tasks. Even with avoidance capabilities, stress impacts behavior, suggesting a rodent model for human stress effects.

Area of Science:

  • Behavioral Neuroscience
  • Stress Research
  • Operant Conditioning

Background:

  • Sustained stress is known to affect cognitive and behavioral functions.
  • Understanding the impact of stress on learning and performance is crucial for modeling human conditions.

Purpose of the Study:

  • To determine the effects of sustained stress on response rate and temporal patterning in rats.
  • To investigate if stress impairs previously learned behaviors or acquisition of new tasks.

Main Methods:

  • Rats were exposed to a chronic stress paradigm involving intermittent footshock.
  • Two groups experienced stress: one could avoid/escape shock, the other had no control (Yoked). A control group received no shock.
  • Behavioral responses were measured using a fixed-interval (FI 60) schedule in operant cages.

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Main Results:

  • Stress significantly decreased response rate and temporal patterning (quarter-life) on the first day of exposure for both stressed groups.
  • Behavioral recovery was observed by stress Days 3 and 2 for food intake and quarter-life, respectively.
  • Acquisition of the FI task was significantly impaired in stressed rats, with performance delayed compared to controls.

Conclusions:

  • Sustained stress negatively impacts both the rate and temporal patterning of behavior in rats.
  • The findings suggest this rodent stress paradigm can effectively model aspects of stress-induced behavioral changes in humans.