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 | Â | Occipital dominant alpha activity |
A2 | Relaxed wakefulness | Starting shifts of alpha to central and frontal cortical areas |
A3 | Â | Continued frontalization of alpha |
B1 | Drowsiness | Low amplitude, desynchronized EEG with horizontal SEM |
B2/3 | Â | Dominant delta- and theta-power |
C | Sleep onset | Occurrence of K-complex and sleep spindles |