Table 1.

Conductivities (S/m) of the head tissues at different stimulation frequencies [36, 37].

Tissue	Conductivity (S/m)
	40 Hz	50 Hz	85 Hz	130 Hz
Air internal	0	0	0	0
Artery, blood vessels, vein	0.7	0.7	0.7	0.7
Mandible, marrow red, skull, teeth, vertebrae	0.0201	0.0201	0.0201	0.0201
Brain grey matter, hippocampus, hypothalamus, thalamus	0.0681	0.0753	0.0869	0.0915
Brain white matter, commissure	0.0506	0.0533	0.0573	0.0590
Cartilage, ear cartilage, intervertebral disks,	0.171	0.171	0.172	0.172
cerebellum	0.0881	0.0953	0.107	0.111
Cerebrospinal Fluid (CSF)	2	2	2	2
Connective tissue, tendon, ligament	0.263	0.270	0.295	0.322
Cornea,	0.421	0.421	0.422	0.422
Muscle	0.224	0.233	0.259	0.278
Ear skin, skin	0.0002	0.0002	0.0002	0.0002
Eye lens,	0.321	0.321	0.322	0.323
Eye sclera	0.503	0.503	0.503	0.503
Eye vitreous humor	1.5	1.5	1.5	1.5
Fat, subcutaneous adipose tissue (SAT)	0.0188	0.0196	0.0206	0.0210
Hypophysis, pineal body	0.521	0.521	0.522	0.523
Medulla oblongata, midbrain, pons	0.0594	0.0643	0.0721	0.0753
Mucosa	0.00042	0.00043	0.00045	0.00048
Nerve, spinal cord	0.0269	0.0274	0.0280	0.0281
Tongue	0.271	0.271	0.272	0.272