Table 4.

Fatigue Evaluation Based on EEG (Yuan et al., 2009).

Driving fatigue	R value
Conscious	R < 1.15
Low fatigue	1.15 ≤ R < 1.25
Middle fatigue	1.25 ≤ R < 1.35
High fatigue	1.35 ≤ R<1.45
Sleep	R ≥ 1.45

Note. EEG = electroencephalogram.