TABLE 1.

Conductivity values (in S/m) of the three models created and used for the sensitivity study: 6CA, six‐compartment head model with anisotropic white matter; 4CI, four‐compartment isotropic head model and 3CI, three‐compartment isotropic head model. The column (:) indicates when the compartment has been split, for example, skull compartment divided between skull compacta and skull spongiosa; while the dash (−) indicates that the compartment has been neglected in the head model. Note that the white matter anisotropic value (i.e., 0.14 S/m) refers to the mean value of the tensor that fits the conductivity value of the isotropic white matter (Vorwerk et al., 2014)

Tissue	6CA (S/m)	4CI (S/m)	3CI (S/m)
White matter	0.14	—	—	Ramon, Schimpf, Haueisen, Holmes, and Ishimaru (2004)
Gray matter	0.33	—	—	Ramon et al. (2004)
Brain	:	0.33	0.33	Ramon et al. (2004)
CSF	1.79	1.79	—	Baumann, Wozny, Kelly, and Meno (1997)
Skull compacta	0.008	—	—	Dannhauer, Lanfer, Wolters, and Knösche (2011)
Skull spongiosa	0.025	—	—	Dannhauer et al. (2011)
Skull	:	0.01	0.01	Dannhauer et al. (2011)
Scalp	0.43	0.43	0.43	Dannhauer et al. (2011), Ramon et al. (2004)

Abbreviation: CSF, cerebrospinal fluid.