Power spectra for patients on Days 1 and 2 after coma onset. Normalized power spectra frequencies, averaged across patients and across electrodes, in arbitrary units for patients in the training set of one representative fold with FO, blue line and UO, pink line for Days 1 and 2 (N = 73). On Day 1, differences were observed across the whole electrode montage and especially between 4.6 and 15.2 Hz (cluster permutation statistical analysis, P < 0.05, two-tailed). Topographical insets illustrate the difference in power spectra between FO and UO in the frequency range between 4.6 and 15.2 Hz