Before revision:  We test it with 32 crisis registered in 5 patients , for which we also have the degree of loss of consciousness as determined from a behavioural analysis. The method can achieve a precision of 85\% and a recall of 88\% in the identification of seizures, and 77\% and 88\% in the identification of recruited electrodes. The intuitive nature of the analysis allows us to identify certain physiological features that are correlated with the degree of loss of consciousness. For example, epileptic crisis in which the variance of the power in the alpha band increases at around seizure onset are particularly likely to impair consciousness. We conclude that the PCA of the distribution of power in different frequency bands provides information both about the detection and the characterization of epileptic seizures.
After revision:  We test it with 32 crisis registered in 5 patients . The area below the resulting receiver-operating characteristic curves was 87