Fig. 2.

Feedback trials of SCP Neurofeedback training. a Mean absolute SCP amplitudes in positive and negative SCP trials in subsequent days of the training. There were 3 training blocks (a maximum of 10 days each) separated by 1-month breaks. On several days the patient was not able to participate or the registered EEG signal was contaminated with artifacts and could not be used for the estimation of mean absolute SCP amplitudes. Therefore, blocks 2 and 3 comprised only 7 days. Bottom plots show mean SCP amplitude values obtained in b negative and c positive SCP feedback trials in all training blocks. Trend lines represent the direction of SCP amplitude changes in the course of training days. For several training days mean SCP amplitudes could not be calculated (the rationale see above) and thus some values are missing