title: Phase-based features for motor imagery brain-computer interfaces.
abstract: Motor imagery (MI) brain-computer interfaces (BCIs) translate a subject's motor intention to a command signal. Most MI BCIs use power features in the mu or beta rhythms, while several results have been reported using a measure of phase synchrony, the phase-locking value (PLV). In this study, we investigated the performance of various phase-based features, including instantaneous phase difference (IPD) and PLV, for control of a MI BCI. Patterns of phase synchrony differentially appear over the motor cortices and between the primary motor cortex (M1) and supplementary motor area (SMA) during MI. Offline results, along with preliminary online sessions, indicate that IPD serves as a robust control signal for differentiating between MI classes, and that the phase relations between channels are relatively stable over several months. Offline and online trial-level classification accuracies based on IPD ranged from 84% to 99%, whereas the performance for the corresponding amplitude features ranged from 70% to 100%.
authors.affiliation: Defitech Center for Neuroprosthetics,School of Engineering, Ecole Polytechnique Fédéral de Lausanne, Lausanne, Switzerland. benjamin.hamner@epfl.ch
authors.forename: Benjamin
authors.initials: B
authors.lastname: Hamner
authors.forename: Robert
authors.initials: R
authors.lastname: Leeb
authors.forename: Michele
authors.initials: M
authors.lastname: Tavella
authors.forename: José
authors.initials: J
authors.lastname: del R Millán
mesh_terms: D001499:Bayes Theorem; D006801:Humans; D008328:Man-Machine Systems; D009044:Motor Cortex / Q000502:physiology*; D011336:Probability; D014584:User-Computer Interface