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Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG
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Ketamine modulates theta and gamma oscillations.

Maciej T Lazarewicz1, Richard S Ehrlichman, Christina R Maxwell

  • 1Neuroengineering Laboratory, Department of Bioengineering, University of Pennsylvania, Philadelphia 19104, USA. mlazarew@seas.upenn.edu

Journal of Cognitive Neuroscience
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Ketamine, an N-methyl-D-aspartate (NMDA) receptor antagonist, alters brain wave activity in mice. It affects theta and gamma frequencies, impacting sensory gating and potentially schizophrenia models.

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Area of Science:

  • Neuroscience
  • Psychopharmacology

Background:

  • Ketamine (NMDA receptor antagonist) models schizophrenia symptoms.
  • Ketamine affects sensory gating and neuronal oscillations.

Purpose of the Study:

  • Investigate ketamine's effects on hippocampal CA3 network activity.
  • Analyze ketamine's impact on background, evoked, and induced neural activity using a paired-click paradigm.

Main Methods:

  • In vivo electrophysiological recordings from mouse hippocampus (CA3 region).
  • Paired-click auditory gating paradigm.
  • Analysis of theta and gamma frequency band activity.

Main Results:

  • Ketamine attenuates theta band power in background and evoked activity.
  • Ketamine disrupts poststimulus theta power reduction.
  • Ketamine enhances gamma band power but decreases relative induced power.

Conclusions:

  • NMDA receptor function is crucial for balancing theta and gamma responses.
  • Findings suggest implications for understanding schizophrenia pathophysiology.