Table 1.

Association between BOLD and ECoG signal

	Beta coefficient	t-stat	p value
Positive BOLD (contra-)
HFB (P1)	0.16	2.46	0.019*
Alpha (P1)	− 0.01	− 0.21	0.830
Beta (P1)	− 0.27	− 1.14	0.262
HFB (P2)	0.07	1.95	0.063
Alpha (P2)	− 0.10	− 2.40	0.024*
Beta (P2)	− 0.27	− 0.86	0.390
HFB (P1&P2)	0.08	2.87	0.005*
Alpha (P1&P2)	− 0.07	− 2.50	0.010*
Beta (P1&P2)	0.04	0.43	0.664
Negative BOLD (ipsi-)
HFB (P1)	− 0.06	− 0.96	0.345
Alpha (P1)	− 0.01	− 0.24	0.807
Beta (P1)	− 0.01	− 0.12	0.904
HFB (P2)	0.16	1.10	0.282
Alpha (P2)	− 0.07	− 0.92	0.363
Beta (P2)	0.36	1.04	0.305
HFB (P1&P2)	0.04	0.54	0.589
Alpha (P1&P2)	− 0.07	− 1.68	0.096
Beta (P1&P2)	0.17	1.13	0.262

Multivariate general linear model results for contra-lateral and ipsi-lateral visual stimulation: beta coefficients, t-statistics and the associated p values are reported for both participants, individually (P1, P2; * indicate p values are smaller than 0.05) as well as combined, using multilevel regression (P1&P2). Among the selected electrodes responding to visual stimulation (see “Materials and methods”), PBR is associated with increasing HFB and is negatively correlated with alpha power measured in the contralateral visual stimulation, while no significant association is observed for beta power. NBR is associated with decreases in alpha power but its amplitude does not appear to be linearly related with HFB, alpha or beta power in the ipsilateral condition (see also Fig. 4) among the selected electrodes