Fig. 4

The effect of (a) placebo training and (b) of mental practice with no visual feedback. Graphs present EEG power as a function of frequency recorded at C4 for both conditions. Fig. 4a shows EEG power in patient P5 during neurofeedback training (‘NF’), placebo training (‘Placebo’) and pre-training baseline (‘Pre NG’), Fig. 4b shows EEG power in patient P5 during neurofeedback (‘NF’), mental practice without a feedback (‘Practice’) and pre-training baseline (‘Pre NF’). Black bars under graphs a and b show statistically significant differences for ‘NF’-‘Pre NF’, while grey bars show statistically significant difference for ‘Pre NF’-‘Placebo’ in (a) and for ‘Pre NF’-‘Practice’ in (b)