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Related Experiment Video

Updated: May 31, 2026

Reversible Cooling-induced Deactivations to Study Cortical Contributions to Obstacle Memory in the Walking Cat
09:43

Reversible Cooling-induced Deactivations to Study Cortical Contributions to Obstacle Memory in the Walking Cat

Published on: December 11, 2017

Cortical inactivation by cooling in small animals.

Ben Coomber1, Darren Edwards, Simon J Jones

  • 1MRC Institute of Hearing Research, University Park Nottingham, UK.

Frontiers in Systems Neuroscience
|July 8, 2011
PubMed
Summary

Surface cooling inactivates the auditory cortex without affecting subcortical structures. This method precisely targets cortical areas for functional studies, minimizing unintended cooling of deeper brain regions.

Keywords:
auditory cortexcooling inactivationcryoloopthallium autometallography

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Last Updated: May 31, 2026

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Sensory Systems

Background:

  • Reversible cortical inactivation using surface cooling is crucial for understanding specific brain area functions.
  • Previous studies using cooling cryoloops in cats and rodents raised concerns about non-cortical structure cooling.
  • Concerns existed regarding direct cooling or blood perfusion affecting subcortical auditory structures.

Purpose of the Study:

  • To validate the efficacy of surface cooling cryoloops for auditory cortex inactivation in guinea pigs.
  • To assess the extent of thermal spread to subcortical auditory structures during cortical cooling.
  • To confirm that cryoloop cooling primarily affects cortical regions without significant subcortical impact.

Main Methods:

  • Implanted a cooling cryoloop on the guinea pig cortex, cooling to 2°C.
  • Measured thermal gradients across the neocortical surface and subcortical structures (auditory thalamus, midbrain, middle ear).
  • Assessed neural activity reduction by measuring thallium ion uptake after intravenous injection.

Main Results:

  • Surface cooling to 2°C reduced cortical temperature to 20-24°C within a 2.5 mm radius.
  • This temperature drop inactivated most cortical cells and the entire auditory region.
  • Subcortical structures experienced only a minor temperature drop (approx. 4°C), insufficient to reduce neural activity.
  • Thallium uptake confirmed widespread ipsilateral cortical inactivation with minimal subcortical effects.

Conclusions:

  • Surface cooling cryoloops effectively inactivate the auditory cortex in guinea pigs.
  • This method demonstrates minimal thermal spread to critical subcortical auditory structures.
  • Surface cooling is a viable technique for precise, localized cortical functional studies.