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Ketamine amplifies induced gamma frequency oscillations in the human cerebral cortex

Shaw, Alexander D., Saxena, Neeraj, Jackson, Laura E., Hall, Judith E., Singh, Krish D. and Muthukumaraswamy, Suresh D. 2015. Ketamine amplifies induced gamma frequency oscillations in the human cerebral cortex. European Neuropsychopharmacology 25 (8) , pp. 1136-1146. 10.1016/j.euroneuro.2015.04.012

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At subanaesthetic doses, ketamine, an N-methyl-D-aspartate (NMDA) receptor antagonist, has demonstrated remarkable and rapid antidepressant efficacy in patients with treatment-resistant depression. The mechanism of action of ketamine is complex and not fully understood, with altered glutamatergic function and alterations of high-frequency oscillatory power (Wood et al., 2012) noted in animal studies. Here we used magnetoencephalography (MEG) in a single blind, crossover study to assess the neuronal effects of 0.5 mg/kg intravenous ketamine on task-related high-frequency oscillatory activity in visual and motor cortices. Consistent with animal findings, ketamine increased beta amplitudes, decreased peak gamma frequency in visual cortex and significantly amplified gamma-band amplitudes in motor and visual cortices. The amplification of gamma-band activity has previously been linked in animal studies to cortical pyramidal cell disinhibition. This study provides direct translatable evidence of this hypothesis in humans, which may underlie the anti-depressant actions of ketamine.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Neuroscience and Mental Health Research Institute (NMHRI)
Cardiff University Brain Research Imaging Centre (CUBRIC)
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Uncontrolled Keywords: Ketamine; Gamma oscillations; NMDA receptor; Magnetoencephalography; Visual cortex; Motor cortex
Publisher: Elsevier
ISSN: 0924-977X
Date of Acceptance: 10 April 2015
Last Modified: 12 Oct 2020 17:00

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