Table 1.

The reference values of the absolute and relative conductivity of the compartments incorporated in the human head.

compartments	Geddes & Baker (1967)	Oostendorp (2000)	Gonçalves (2003)	Guttierrez (2004)	Lai (2005)
scalp	0.43	0.22	0.33	0.749	0.33
skull	0.006 – 0.015	0.015	0.0081	0.012	0.0132
cerebro-spinal fluid	-	-	-	1.79	-
brain	0.12 – 0.48	0.22	0.33	0.313	0.33
σscalp/σskull	80	15	20–50	26	25