A Comparison of EEG Patterns During Active and Passive Control of Haptic Devices in Stroke Patients

A Comparison of EEG Patterns During Active and Passive Control of Haptic Devices in Stroke Patients
Stroke; Rehabilitation; EEG
Issue Date
Society for Neuroscience 2013
Effective rehabilitation therapiesinthe acute stage can improve functional recovery and minimize impairments.Robot-assisted rehabilitation therapies have been developed to overcome the problem of labor-intensivework in the traditional physical therapy. Recently, an approach to combine brain-computer interfaces (BCIs) with the robot-assisted technology has emerged, enabling volitional and asynchronous control of robots by detecting movement intentions via BCIs. A prerequisite to this approach includes understanding how brain activity in stroke patients is modulated during the rehabilitation trainingwith robotic devices. Hence, the present study investigateshow brain activity patterns change when the patients volitionally control devicesin rehabilitation training.Specifically, we aim to find differences in electroencephalography (EEG) patterns during active and passive control of a haptic device.Eleven chronic stroke patients participated in the study and were askedto grasp or supinate the handle of a haptic device with active or passive controlmodes. The haptic device operated regardless of the patient’s intention in the passive modewhereas it was completely moved by thepatients in the active mode.Each trial was composed of three successive periods, including the task period (2s), the hold period (1s) and the return period (2s). We recorded 64-channel EEG in the patients during the experiment. After processing EEG signals to extract event-related synchronization/desynchronization (ERS/ERD) of the sensorimotor rhythms, we extracted features of temporal ERS/ERD patterns, includinga minimum peak, a slope of ERDand the area under curve (AUC), andanalyzed the effects of different tasks (active and passive) on these features. In the task period, paired sample t-testsrevealed significantlygreater minimum peak values and stiffer slopes of ERD during the active mode than during the passive modes (p < 0.05). In the hold period
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