Fig. 3

The first active electrode was placed on the nuchal crest in the midline (P_z-0). The following positions along the midline were placed in front of the nuchal crest at regular intervals (P_z-0 to P_z-60). Lateral positions, P₁ to P₄, were evaluated with electrodes placed two and four centimeters lateral to the midline electrode at P_z-45. Photo: Dr Måns Michanek