Modulation of Functional Connectivity Evaluated by Surface EEG in Alpha and Beta Band During a Motor-Imagery Based BCI Task

Brain-computer interfaces (BCI) has being used to treat and assist neurologic patients to make the activities of daily living through electroencephalography (EEG) signals. Real movement or imagery movement produce changes in power of sensorimotor rhythms, called event-related (de)synchronization for the supression or for the increase of oscillatory activities. Also, changes between functional connectivity of cortical areas have been reported, evaluated by different recording techniques. Using the phase-locking-value index (PLV), we compared the changes in functional connectivity with the changes in power of surface EEG of ten healthy subjects during a BCI task using motor imagery. Modulation of functional connectivity related to task and to the discriminate band frequencies were studied, what might have implications for improving control of BCI systems.

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