Fig. 7

Spectrograms of the alpha band modulation recordings. Each subplot shows a spectrogram for one subject with the grand average alpha power or coherence plotted below. a Power spectrogram of the ERE-ERB electrode pair. b Power spectrogram of the TP10-Cz electrode pair. c Spectrogram of the coherence between the ERE-ERB and TP10-Cz electrode pairs. The white dashed lines denote the instances of changes between open and closed eyes. The shaded area of the grand average plots is the standard deviations of the grand averages