Threshold Research on Highway Length under Typical Landscape Patterns Based on Drivers’ Physiological Performance

Table 3

Correlation analysis of ECG indices in each scenario.

Landscape pattern	Indices	LF	HF	LF/HF	HR
Open	LF	1.00	—	—	—
	HF	.54	1.00	—	—
	LF/HF	.73	−.75	1.00	—
	HR	−.29	−.15	.09	1.00
Semiopen	LF	1.00	—	—	—
	HF	.53	1.00	—	—
	LF/HF	.74	−.73	1.00	—
	HR	.28	.07	.20	1.00
Vertical	LF	1.00	—	—	—
	HF	.54	1.00	—	—
	LF/HF	.76	−.75	1.00	—
	HR	.32	.31	.33	1.00

Significant at the 0.01 level.