Temporal evolution of gamma activity in human cortex during an overt and covert word repetition task.

Frontiers in Human Neuroscience
Eric C LeuthardtGerwin Schalk

Abstract

Several scientists have proposed different models for cortical processing of speech. Classically, the regions participating in language were thought to be modular with a linear sequence of activations. More recently, modern theoretical models have posited a more hierarchical and distributed interaction of anatomic areas for the various stages of speech processing. Traditional imaging techniques can only define the location or time of cortical activation, which impedes the further evaluation and refinement of these models. In this study, we take advantage of recordings from the surface of the brain [electrocorticography (ECoG)], which can accurately detect the location and timing of cortical activations, to study the time course of ECoG high gamma (HG) modulations during an overt and covert word repetition task for different cortical areas. For overt word production, our results show substantial perisylvian cortical activations early in the perceptual phase of the task that were maintained through word articulation. However, this broad activation is attenuated during the expressive phase of covert word repetition. Across the different repetition tasks, the utilization of the different cortical sites within the perisylvian region...Continue Reading

Citations

Sep 18, 2013·Biological Psychiatry·Michael J Wesley, Warren K Bickel
Jul 1, 2015·Frontiers in Neuroscience·Christian HerffTanja Schultz
Mar 12, 2015·Frontiers in Human Neuroscience·Fabien LotteGerwin Schalk
Mar 29, 2014·Frontiers in Computational Neuroscience·Emily P StephenMark A Kramer
Jul 6, 2016·Brain and Language·Stephanie MartinBrian N Pasley
Oct 13, 2016·Frontiers in Neuroscience·Christian Herff, Tanja Schultz
Jan 9, 2019·Neurotherapeutics : the Journal of the American Society for Experimental NeuroTherapeutics·Qinwan RabbaniNathan E Crone
Mar 11, 2020·Cognitive Processing·Lílian Rodrigues de AlmeidaPeter C Hansen
May 21, 2020·Biomedical Engineering Letters·Dipti Pawar, Sudhir Dhage
Jun 26, 2018·Brain : a Journal of Neurology·Karin TrimmelJohn S Duncan
Mar 7, 2019·Frontiers in Neuroscience·Griffin MilsapNathan E Crone
Mar 17, 2020·Frontiers in Neuroscience·Christian HerffPieter Kubben
Jul 7, 2018·Frontiers in Neuroscience·Stephanie MartinBrian N Pasley

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