Table 4.

Summary of characteristic of studies that investigated vigilance detection quantification using wearable devices.

No.	Type of study	# of participants	Fatiguing task	Task duration	Input data	Reference measure	Modeling approach	Output	Model performance
9	Lab	10	Two-phase Mackworth Clock Test	30 min	EEG (brain activity and eye blinking)	Performance	Fuzzy logic	4 levels	ACC = 95%
10	Lab	10	Three-trial construction task (moving two mental tubes to a predefined location)	Not stated	EEG	NASA-TLX and EEG-vigilance stage model	Vigilance ratio index	Continuous vigilance level/3 levels	r = 0.73/r = 0.75
11	Lab	10	Three-trial construction task (moving two mental tubes to a predefined location)	Not stated	EEG	EEG-based benchmark	Vigilance ratio index	Continuous vigilance level	Cosine similarity = 0.90–0.92

EEG, electroencephalogram; NASA-TLX, NASA Task Load Index; ACC, accuracy; r, correlation coefficient.