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A Pressure Injection System for Investigating the Neuropharmacology of Information Processing in Awake Behaving Macaque Monkey Cortex
Published on: March 14, 2016
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Gamma-burst cortical activity in awake behaving macaques.
Biorxiv : the Preprint Server for Biology
|October 9, 2023
Summary
Ketamine anesthesia causes a gamma-burst pattern, but NMDA receptor antagonism alone doesn't fully explain it. Delta-band oscillations are key to ketamine's anesthetic effects.
Area of Science:
- Neuroscience
- Anesthesiology
- Pharmacology
Background:
- Ketamine anesthesia induces a characteristic "gamma-burst" pattern of electrophysiological activity.
- The role of N-methyl-D-aspartate (NMDA) receptor antagonism in this pattern and its link to dissociative anesthesia is not fully understood.
Purpose of the Study:
- To investigate the role of NMDA receptor antagonism in generating the gamma-burst pattern.
- To explore the connection between gamma-bursts and dissociative anesthesia.
- To identify the specific mechanisms underlying ketamine's anesthetic effects.
Main Methods:
- Multi-site intracranial electrophysiology and behavioral analysis in rhesus macaques.
- Comparison of ketamine effects with a selective NMDA receptor antagonist (CGS 19755).
Main Results:
- CGS 19755 induced electrophysiological activity similar to ketamine anesthesia.
- Animals treated with CGS 19755 could perform memory tasks, unlike with ketamine.
- A key difference was the lack of delta-band local field potential (LFP) modulation with CGS 19755.
Conclusions:
- NMDA receptor antagonism alone does not fully account for ketamine-induced delta-band oscillations.
- Delta-band oscillations play a crucial role in mediating the anesthetic effects of ketamine.
- Further mechanisms beyond NMDA antagonism are involved in ketamine's anesthetic action.
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