Fig. 3From: Delayed mirror visual feedback presented using a novel mirror therapy system enhances cortical activation in healthy adultsTypical examples of the time-course event-related desynchronization (ERD) waveforms of the C3, Cz, and C4 channels for all three test conditions: no-mirror visual feedback (MVF) (a), MVF (b), and delayed-MVF (c) conditions. The red circles mark the points where the mu power amplitude decreased from or increased to the relative peak and was lower than the reference level in response to the button press or MVF. a ERD mainly occurred after the button press. b ERD occurred earlier and with significantly larger amplitude in response to MVF compared to that observed with no MVF. c ERD reappeared when delayed MVF was provided around 2Â s after the button pressBack to article page