Figure 2
From: Night and day variations of sleep in patients with disorders of consciousness
Power spectra ratios across day and night. Both MCS and control subjects revealed statistically significant changes from day to night-time of high-to-low and of alpha-to-theta frequency power ratios, indicating a prevalence of higher frequencies during day-time. No diurnal variation in these measures was observed in UWS patients. High frequencies range from 8–30 Hz, low frequencies range from 2–8 Hz, alpha is defined as 8–12 Hz and theta as 4–8 Hz. Abbreviations: UWS = Unresponsive Wakefulness Syndrome; MCS = Minimally Conscious State.
