Table 3. Estimated parameters: these are the parameters estimated from synthetic and measured EEG-fMRI data (one example session, all frequencies).

Electrical, vascular and coupling parameters
					Synthetic		Observed
Type	Description	Symbol	Units	Prior	True	Estimated	Estimated
Electrical ()
	Synaptic input			1.00	0.80	0.85	0.94
	Synaptic input			1.00	1.00	1.00	1.00
	Synaptic input			1.00	0.50	0.60	0.60
	GABAergic IN synaptic factor			0.30	0.50	0.49	0.53
	PC voltage-ampere function			0.60	0.90	0.78	0.42
	V PC voltage-ampere function			6.00	4.00	5.62	5.95
Vascular ()
	Signal decay			0.65	0.50	0.65	0.59
	Autoregulation			0.41	0.28	0.41	0.40
	Transit time			0.98	0.78	0.98	0.91
	Stiffness		no dim.	0.32	0.25	0.32	0.32
	Resting O2 extraction fraction		no dim.	0.34	0.30	0.34	0.34
Coupling
NO model ()	NO concentration baseline		no dim.	0.10	0.30	0.29	0.29
	NO synaptic current factor (IN)			1.59e03	1.50e03	1.59e03	1.59e03
FR model ()	PC voltage-ampere function			0.78	0.90	0.63	0.17
	PC voltage-ampere function			5.62	4.00	5.70	7.98
Mixture model ()	NO coefficient		no dim.	0.50	0.40	0.40	0.29
	FR coefficient		no dim.	0.50	0.60	0.60	0.71

The parameter for the synaptic input model corresponds to: (see Eq. 6–8 and Table 2 in Text S1).