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Table 1 Assessment of brain arousal states by applying VIGALL 2.1

From: Impact of brain arousal and time-on-task on autonomic nervous system activity in the wake-sleep transition

EEG-vigilance stage Corresponding behavioral state EEG-characteristics
0 Cognitively active wakefulness Low amplitude, desynchronized non-alpha EEG without horizontal SEM
A1 Relaxed wakefulness Occipital dominant alpha activity
A2 Shifts of alpha to central and frontal cortical areas
A3 Continued frontalization of alpha
B1 Drowsiness Low amplitude, desynchronized non-alpha EEG with SEM
B2/3 Dominant delta- and theta-power
C Sleep onset Occurrence of K-complexes and sleep spindles
  1. VIGALL Vigilance Algorithm Leipzig, EEG electroencephalogram, SEM slow eye movements