title: Classification of hand posture from electrocorticographic signals recorded during varying force conditions.
abstract: In the presented work, standard and high-density electrocorticographic (ECoG) electrodes were used to record cortical field potentials in three human subjects during a hand posture task requiring the application of specific levels of force during grasping. We show two-class classification accuracies of up to 80% are obtained when classifying between two-finger pinch and whole-hand grasp hand postures despite differences in applied force levels across trials. Furthermore, we show that a four-class classification accuracy of 50% is achieved when predicting both hand posture and force level during a two-force, two-hand-posture grasping task, with hand posture most reliably predicted during high-force trials. These results suggest that the application of force plays a significant role in ECoG signal modulation observed during motor tasks, emphasizing the potential for electrocorticography to serve as a source of control signals for dexterous neuroprosthetic devices.
authors.affiliation: University of Pittsburgh, Pittsburgh, PA, USA.
authors.forename: Alan D
authors.initials: AD
authors.lastname: Degenhart
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Collinger
authors.forename: Ramana
authors.initials: R
authors.lastname: Vinjamuri
authors.forename: John W
authors.initials: JW
authors.lastname: Kelly
authors.forename: Elizabeth C
authors.initials: EC
authors.lastname: Tyler-Kabara
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
mesh_terms: D000465:Algorithms; D004569:Electroencephalography / Q000379:methods*; D006225:Hand / Q000502:physiology*; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D009044:Motor Cortex / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology; D053580:Muscle Strength / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology; D011187:Posture / Q000502:physiology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity