Fig. 4.
EEG data with hypsarrhythmia is associated with decreased temporal correlations in the beta frequency band when calculated with autocorrelation. a The median normalized autocorrelation function of the amplitude envelope in patients with hypsarrhythmia (red, n=25), patients without hypsarrhythmia (blue, n=17), and surrogate data (green, n=42). The respective shaded areas represent data between the 25th and 75th quantile of individual autocorrelation functions. The black line indicates the 95th quantile of the surrogate data used as the threshold of significance for patient data. b Boxplots of the distribution of lag times at which individual patient autocorrelation functions were no longer significant, for patient data with (red) and without (blue) hypsarrhythmia. Patients with intermittent hypsarrhythmia are included in the hypsarrhythmia boxplot