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Table 1 Assessment of brain arousal states by applying VIGALL 2.0

From: Evoked potentials and behavioral performance during different states of brain arousal

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