Visual gamma oscillations and evoked responses: variability, repeatability and structural MRI correlates

NeuroImage
Suresh D MuthukumaraswamyDerek K Jones

Abstract

There is increasing interest in the role gamma oscillations ( approximately 40 Hz) play in visual information processing. Despite this interest, and in contrast to the classically studied visual evoked potential, surprisingly little is known about the intra-individual repeatability of induced gamma oscillations. Similarly, little is known about inter-individual variability in terms of gamma oscillation frequency, bandwidth and amplitude with no extant normative data for these parameters. The purpose of the current study was therefore to examine the repeatability of visual gamma oscillations and to provide the first normative data on them. Our results demonstrate that evoked responses were highly repeatable across recording sessions whereas for induced visual gamma oscillations a large amount of inter-individual variability existed in terms of frequency, bandwidth and amplitude. However, these parameters and the general morphology of the gamma band response were stable within the same individuals for at least 4 weeks. The high degree of individual variability in gamma oscillations for gamma amplitude, bandwidth and frequency suggests that between-group studies on gamma oscillations will be difficult, requiring relatively large a...Continue Reading

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Citations

Jan 31, 2013·Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology·Suresh D MuthukumaraswamyKrish D Singh
Jan 28, 2014·PloS One·Kristina L McFaddenDonald C Rojas
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Mar 13, 2014·The European Journal of Neuroscience·Gavin Perry, Krish D Singh
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