Table II.

Summary of EEG‐fMRI findings in healthy volunteers for different applied regression models

1	2	3	4	5	6	7	8	9	10	11	12	13
Subject	frac${}_{\text{stan}}^{\text{VIPH}}$	frac${}_{\text{stan}}^{\text{RETRO}}$	frac${}_{\text{stan}}^{\text{RVT}}$	frac${}_{\text{stan}}^{\text{α}}$	frac${}_{\text{VIPH}}^{\text{α}}$	frac${}_{\text{RETRO}}^{\text{α}}$	frac${}_{\text{RV}}^{\text{α}}$	diff${}_{\text{VIPH,stan}}^{\text{α}}$	diff${}_{\text{RETRO,stan}}^{\text{α}}$	diff${}_{\text{RVT,stan}}^{\text{α}}$	E${}_{\text{stan}}^{\text{α}}$: O${}_{\text{VIPH,stan}}^{\text{α}}$: E${}_{\text{VIPH}}^{\text{α}}$	R${}_{\text{VIPH}}^{\text{α}}$
6	0.527	0.297	—	0.426	0.325	0.425	—	−23.7	−0.0	—	0.00 : 0.75 : 0.24	−0.02
7	0.453	0.365	0.248	0.008	0.008	0.008	0.006	−6.1	−6.5	−24.3	0.10 : 0.74 : 0.16	−0.00
8	0.216	0.315	0.378	0.205	0.149	0.209	0.156	−26.9	+2.1	−23.6	0.06 : 0.63 : 0.31	−0.11
9	0.782	0.241	0.492	0.642	0.298	0.651	0.546	−53.7	+1.3	−15.0	0.00 : 0.46 : 0.54	−0.36
10	0.257	0.266	0.519	0.442	0.376	0.448	0.203	−14.8	+1.4	−54.1	0.00 : 0.85 : 0.15	0.00
11	0.332	0.617	0.204	0.241	0.150	0.250	0.224	−37.7	+3.8	−6.8	0.00 : 0.62 : 0.38	−0.24
12	0.769	0.411	0.793	0.716	0.544	0.702	0.465	−24.0	−2.0	−35.0	0.00 : 0.76 : 0.24	0.04
13	0.007	0.556	0.410	0.073	0.070	0.057	0.032	−4.3	−21.4	−56.2	0.05 : 0.87 : 0.09	−0.05
14	0.700	0.036	0.054	0.688	0.482	0.686	0.662	−30.0	−0.3	−3.7	0.00 : 0.70 : 0.30	−0.16
15	0.119	0.288	0.280	0.039	0.015	0.033	0.073	−61.3	−14.5	+86.4	0.03 : 0.64 : 0.34	−0.36
16	0.131	0.142	—	0.024	0.021	0.012	—	−13.1	−50.1	—	0.11 : 0.66 : 0.13	−0.17
17	0.016	0.531	0.085	0.003	0.003	0.003	0.003	+20.9	−3.0	+40.3	0.20 : 0.76 : 0.03	−0.02
18	0.000	0.576	—	0.003	0.002	0.003	—	−27.0	−5.0	—	0.02 : 0.70 : 0.28	0.13
Mean (std)	0.33 (0.29)	0.36 (0.18)	0.35 (0.22)	0.27 (0.28)	0.19 (0.19)	0.27 (0.28)	0.24 (0.24)	−30.4 (21.3)	−0.6 (14.7)	−9.2 (43.4)	0.04 : 0.70 : 0.25	−0.10

The second till fifth column represent the fraction of significantly activated brain voxels resulting from the analyses where VIPH (frac${}_{\text{stan}}^{\text{VIPH}}$), respiratory RETROICOR regressors (frac${}_{\text{stan}}^{\text{RETRO}}$), RVT (frac${}_{\text{stan}}^{\text{RVT}}$) and alpha power (frac${}_{\text{stan}}^{\text{α}}$) were used as a predictor. Columns 6, 7 and 8 represent the analysis of alpha power with the use of VIPH, respiratory RETROICOR or RVT regressors as additional confounders. Columns 9, 10, and 11 show the difference between the alpha power correlations with and without applying VIPH, respiratory RETROICOR regressors or RVT regressors as additional confounders. In column 12 the overlapping ratios of the activated areas of the alpha power analyses with and without VIPH correction are given. The last column represents the correlation between the alpha and VIPH regressors. The last row shows mean and standard deviation (std) values.