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Table 1 EEG description for EEG-vigilance stage and operational definition of arousal stability score and assessment criteria

From: Brain arousal regulation and depressive symptomatology in adults with attention-deficit/hyperactivity disorder (ADHD)

EEG-vigilance stage EEG description Arousal stability score Operational definition Criterion
0 Low amplitude, desynchronized non-alpha EEG without horizontal SEM 11 Unique occurrence of 0 and A1 More than 2/3 of all segments are attributed as 0/A1 or 0/A stages
10 Unique occurrence of 0 and A
A1 Occipital dominant alpha 9 Stage B1 in third 5 min At least 1/3 of all segments are attributed as stage B1
A2 Shift of alpha to central and frontal areas 8 Stage B1 in second 5 min
A3 Continued frontalization of alpha 7 Stage B1 in first 5 min
B1 Low amplitude, desynchronized EEG with horizontal SEM 6 Stage B2/3 in third 5 min At least 1/3 of all segments are attributed as stage B2/3
5 Stage B2/3 in second 5 min
B2/3 Dominant delta and theta 4 Stage B2/3 in first 5 min  
C Occurrence of K-complex and sleep spindles 3 Stage C in third 5 min Occurrence of stage C
2 Stage C in second 5 min
1 Stage C in first 5 min
  1. SEM slow eye movement