Mental workload prediction model based on information entropy

Figures & data

Figure 1. Comparison of communication system model, dispatch information transmission model, and S-O-R cognitive model.

Table 1. Mental workload for visual behaviors.

Type	Code	Visualbehaviors	Weightedvalue ω	Value of ω afternormalization
Visualbehaviors	1	Visually register/detect	1.0	0.031
	2	Visually discriminate	3.7	0.116
	3	Visually inspect/check	4.0	0.125
	4	Visually locate/align	5.0	0.156
	5	Visually track/follow	5.4	0.169
	6	Visually read	5.9	0.184
	7	Visually scan/search/monitor	7.0	0.219

Figure 2. Experimental interface.

Table 2. Task information under different experimental scenarios.

Task number	Information content	Number of states	Weighted value	Display duration (s)	Amount of information (bit)
T1H1	Textual information	3	0.184	8	1 × 0.184× log2^3
T1H2	Railway crossings	2	0.031	10	16 × 0.031×log2^2
T1H3	Signal lights	2	0.031	10	33 × 0.031×log2^2
T1H4	Textual information, signal lights	3 2	0.184, 0.031	5, 10	1 × 0.184×log2^3, 33 × 0.031×log2^2
T1H5	Railway crossings, distance between trains	2 3	0.031, 0.116	10, 12	16 × 0.031×log2^2, 10 × 0.116×log2^3
T2H1	Textual information	3	0.184	3	1 × 0.184×log2^3
T2H2	Railway crossings	2	0.031	5	16 × 0.031×log2^2
T2H3	Signal lights	2	0.031	5	33 × 0.031×log2^2
T2H4	Textual information, signal lights	3 2	0.184, 0.031	3, 5	1 × 0.184×log2^3 33 × 0.031×log2^2
T2H5	Railway crossings, distance between trains	2 3	0.031, 0.116	5, 7	16 × 0.031×log2^2 10 × 0.116×log2^3

Table 3. Modeling and measuring results under different MW conditions (mean ± SD).

MW Condition	Prediction (bit/s)	Accuracy (%)	Subjective Score (point)	Blink Frequency (times/s)	Pupil Diameter (mm)
1	0.0365	98.7 ± 2.2	8.45 ± 2.87	0.281 ± 0.132	3.31 ± 0.36
2	0.0496	93.2 ± 5.3	12.85 ± 3.63	0.248 ± 0.112	3.49 ± 0.36
3	0.0972	91.9 ± 3.9	12.4 ± 4.76	0.216 ± 0.101	3.43 ± 0.38
4	0.0992	86.9 ± 7.8	18.7 ± 6.41	0.217 ± 0.099	3.63 ± 0.44
5	0.1023	78.5 ± 6.7	22.8 ± 5.36	0.178 ± 0.092	3.67 ± 0.4
6	0.1388	76.3 ± 11.8	26.4 ± 6.25	0.162 ± 0.089	3.63 ± 0.42
7	0.2028	71.2 ± 8.1	31.2 ± 6.61	0.127 ± 0.071	3.6 ± 0.43
8	0.2046	73 ± 8.9	31.15 ± 6.86	0.141 ± 0.082	3.66 ± 0.42
9	0.3018	70.3 ± 8.3	32.4 ± 6.11	0.109 ± 0.058	3.74 ± 0.46
10	0.3619	57.3 ± 9.8	41.9 ± 8.77	0.084 ± 0.049	3.86 ± 0.35