title: Contributions of Subsurface Cortical Modulations to Discrimination of Executed and Imagined Grasp Forces through Stereoelectroencephalography.
abstract: Stereoelectroencephalographic (SEEG) depth electrodes have the potential to record neural activity from deep brain structures not easily reached with other intracranial recording technologies. SEEG electrodes were placed through deep cortical structures including central sulcus and insular cortex. In order to observe changes in frequency band modulation, participants performed force matching trials at three distinct force levels using two different grasp configurations: a power grasp and a lateral pinch. Signals from these deeper structures were found to contain information useful for distinguishing force from rest trials as well as different force levels in some participants. High frequency components along with alpha and beta bands recorded from electrodes located near the primary motor cortex wall of central sulcus and electrodes passing through sensory cortex were found to be the most useful for classification of force versus rest although one participant did have significant modulation in the insular cortex. This study electrophysiologically corroborates with previous imaging studies that show force-related modulation occurs inside of central sulcus and insular cortex. The results of this work suggest that depth electrodes could be useful tools for investigating the functions of deeper brain structures as well as showing that central sulcus and insular cortex may contain neural signals that could be used for control of a grasp force BMI.
authors.affiliation: Department of Biomedical Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH, 44106, United States of America.|Louis Stokes Cleveland VA Medical Center, 10701 East Boulevard, Cleveland, OH, 44106, United States of America.
authors.forename: Brian A
authors.initials: BA
authors.lastname: Murphy
authors.affiliation: Department of Neurosurgery, Neurological Institute, University Hospitals Case Medical Center, 11100 Euclid Avenue, Cleveland, OH, 44106, United States of America.
authors.forename: Jonathan P
authors.initials: JP
authors.lastname: Miller
authors.affiliation: Department of Biomedical Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH, 44106, United States of America.
authors.forename: Kabilar
authors.initials: K
authors.lastname: Gunalan
authors.affiliation: Department of Biomedical Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH, 44106, United States of America.|Louis Stokes Cleveland VA Medical Center, 10701 East Boulevard, Cleveland, OH, 44106, United States of America.
authors.forename: A Bolu
authors.initials: AB
authors.lastname: Ajiboye
mesh_terms: D000328:Adult; D004569:Electroencephalography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009044:Motor Cortex / Q000502:physiology*; D052581:Pinch Strength / Q000502:physiology*