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The missing link: analogous human and primate cortical gamma oscillations

Hall, Stephen D., Holliday, Ian E., Hillebrand, Arjan, Singh, Krish Devi, Furlong, Paul L., Hadjipapas, Avgis and Barnes, Gareth R. 2005. The missing link: analogous human and primate cortical gamma oscillations. Neuroimage 26 (1) , pp. 13-17. 10.1016/j.neuroimage.2005.01.009

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Recent animal studies highlighting the relationship between functional imaging signals and the underlying neuronal activity have revealed the potential capabilities of non-invasive methods. However, the valuable exchange of information between animal and human studies remains restricted by the limited evidence of direct physiological links between species. In this study we used magnetoencephalography (MEG) to investigate the occurrence of 30–70 Hz (gamma) oscillations in human visual cortex, induced by the presentation of visual stimuli of varying contrast. These oscillations, well described in the animal literature, were observed in retinotopically concordant locations of visual cortex and show striking similarity to those found in primate visual cortex using surgically implanted electrodes. The amplitude of the gamma oscillations increases linearly with stimulus contrast in strong correlation with the gamma oscillations found in the local field potential (LFP) of the macaque. We demonstrate that non-invasive magnetic field measurements of gamma oscillations in human visual cortex concur with invasive measures of activation in primate visual cortex, suggesting both a direct representation of underlying neuronal activity and a concurrence between human and primate cortical activity.

Item Type: Article
Status: Published
Schools: Psychology
Neuroscience and Mental Health Research Institute (NMHRI)
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Uncontrolled Keywords: Magnetoencephalography (MEG); Gamma; Primary visual cortex; Synthetic aperture magnetometry (SAM); Contrast
Publisher: Elsevier
ISSN: 1053-8119
Last Modified: 04 Jun 2017 04:06

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