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(a) The schematic of the BCI-FES system. (b) The timing of a trial of the motor imagery paradigm. Each trial consisted of task and rest periods. A patient started to execute motor imagery tasks upon the appearance of the cue (“left” or “right”). A virtual avatar of one patient's upper limbs was used to provide virtual reality feedback. (c) This picture shows the scene of BCI-FES rehabilitation training for one patient.
