Table 1.

Conductivities used in finite element models, with sources.

Component	Conductivity (S/m)	Comments/sources
Gray Matter	0.09	Gabriel et al. [22]
White Matter	0.06	Gabriel et al. [22]
CSF (ventricle)	1.80	Baumann et al. [21]
Subarachnoid space	1.20	Estimated from relative contributions of dura 0.5, CSF 1.8, skull 0.02, blood 0.67, and vessel 0.26 S/m per Gabriel et al. [22]
Skull	0.0042	Dannhauer et al. [24]
Scalp	0.24	Estimated from relative contributions of muscle 0.27, skin 0.00046, blood 0.67, vessel 0.26, and fat 0.02 S/m per Gabriel et al. [22]
Tumor-like anomaly in gray matter	0.20	2 times increase over gray matter value
Tumor-like anomaly in white matter	0.12	2 times increase over white matter value
Necrotic region	0.01	Oh et al. [27]
Hydrogel electrode	0.17	Jeon et al. [28]