Table 1 Assessment of brain arousal states by applying VIGALL 2.1
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 |