TABLE 1.

Group‐average peak cross‐correlation and associated lag for the frequency range 0.05–0.15 Hz

	PPG		HRV		SDPPG		PIR
	Mean peak corr	Mean peak lag (s)	Mean peak corr	Mean peak lag (s)	Mean peak corr	Mean peak lag (s)	Mean peak corr	Mean peak lag (s)
Lateral ventricles	0.15 ± 0.03	−2.0 ± 0.3	0.19 ± 0.02	−3.4 ± 0.4	0.12 ± 0.01	−3.3 ± 0.5	0.15 ± 0.02	−2.3 ± 0.4
3rd ventricle	0.12 ± 0.02	−2.8 ± 0.6	0.14 ± 0.02	−3.5 ± 0.4	0.12 ± 0.01	−2.9 ± 0.4	0.12 ± 0.01	−2.8 ± 0.6
Gray matter	0.14 ± 0.02	−3.2 ± 0.6	0.21 ± 0.03	−2.7 ± 0.4	0.10 ± 0.01	−3.6 ± 0.4	0.13 ± 0.02	−2.6 ± 0.44
White matter	0.14 ± 0.03	−3.4 ± 0.4	0.23 ± 0.03	−2.5 ± 0.3	0.13 ± 0.02	−3.2 ± 0.4	0.13 ± 0.02	−2.0 ± 0.4
Arteries	0.14 ± 0.02	−2.5 ± 0.6	0.18 ± 0.03	−3.1 ± 0.5	0.10 ± 0.01	−2.4 ± 0.4	0.13 ± 0.01	−2.5 ± 0.5
Veins	0.18 ± 0.03	−2.1 ± 0.2	0.23 ± 0.03	−3.0 ± 0.5	0.11 ± 0.01	−2.9 ± 0.5	0.19 ± 0.03	−2.3 ± 0.5
Aqueduct	0.14 ± 0.04	−3.6 ± 0.6	0.17 ± 0.02	−3.9 ± 0.3	0.12 ± 0.02	−3.0 ± 0.4	0.17 ± 0.03	−0.2 ± 0.6

Note: All values are listed as mean and SD.