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Updated: Jan 21, 2026

A Novel and Translational Rat Model of Concussion Combining Force and Rotation with In Vivo Cerebral Microdialysis
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A rotating operant chamber for use with microdialysis.

Bart Degreef1, Khanh T Ngo2, Andrea Jaquins-Gerstl2

  • 1Department of Chemical Engineering, Free University of Brussels, Brussels, Belgium.

Journal of Neuroscience Methods
|August 5, 2019
PubMed
Summary

Researchers developed a rotating operant chamber for awake animal studies, enabling high-resolution microdialysis. This new system allows one-minute measurements of dopamine in freely moving rats, advancing behavioral neuroscience research.

Keywords:
ConditioningCueDopamineOnline microdialysis

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Area of Science:

  • Neuroscience
  • Behavioral Science
  • Analytical Chemistry

Background:

  • Microdialysis time resolution has improved, aiding behavioral research in awake animals.
  • Traditional microdialysis in awake animals uses a swivel, which limits measurement time resolution.

Purpose of the Study:

  • To design and construct a rotating operant chamber with microdialysis capability for awake animal studies.
  • To overcome the limitations of swivels in high-resolution microdialysis measurements.

Main Methods:

  • Modified a rotating cage by integrating operant behavior testing components.
  • Incorporated a modular on-board controller powered by a battery for wireless communication.
  • Developed a system for simultaneous behavioral testing and microdialysis in freely moving rats.

Main Results:

  • The rotating operant chamber successfully trained a rat to perform a sucrose pellet retrieval task.
  • Achieved one-minute interval measurements of striatal dopamine using microdialysis and online liquid chromatography.
  • Demonstrated the ability to measure dopamine in awake, freely moving rats interacting with operant components.

Conclusions:

  • Rotating cage modifications are straightforward for creating specialized behavioral testing environments.
  • Enabled one-minute resolution observations of striatal dopamine in awake, mobile animals.
  • Represents a novel method for dopamine measurement in operant chambers, not previously reported.